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MAX13085EASA+中文资料
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19-3590; Rev 1; 4/05
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
General Description
Features
The MAX13080E–MAX13089E
5.0V, ±15kV ESD-protect-ed, RS-485/RS-422 transceivers
feature one driver and? 5.0V Operation
one receiver. These devices include fail-safe circuitry,?Extended ESD Protection for
RS-485/RS-422 I/O Pins
guaranteeing a logic-high receiver output when receiver±15kV Human Body Modelinputs
are open or shorted. The receiver outputs a logic-high if all transmitters on a
terminated bus are disabled?True Fail-Safe Receiver While Maintaining(high
impedance). The MAX13080E–MAX13089E includeEIA/TIA-485 Compatibility a hot-swap
capability to eliminate false transitions on the?Hot-Swap Input Structures on DE and
REbus during power-up or hot insertion.
The MAX13080E/MAX13081E/MAX13082E feature?Enhanced Slew-Rate Limiting Facilitates
Error-reduced
slew-rate
drivers
that
minimize
EMI
andFree
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http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlData Transmission
reduce
reflections
caused
terminated(MAX13080E–MAX13085E/MAX13089E)cables,
transmission
up
to?Low-Current
Shutdown
by
improperly
allowing
Mode
error-free
data
(Except250kbps.
The
MAX13083E/MAX13084E/MAX13085EMAX13081E/MAX13084E/MAX13087E)also
slew-rate-limited
drivers
but
allow
transmitspeeds
up
to
feature
500kbps.
The
MAX13086E/MAX13087E/?Pin-Selectable Full-/Half-Duplex OperationMAX13088E driver
slew rates are not limited, making(MAX13089E)transmit speeds up to 16Mbps possible.
TheMAX13089E slew rate is pin selectable for 250kbps,?Phase Controls to Correct for
Twisted-Pair500kbps, and 16Mbps.
Reversal (MAX13089E)The MAX13082E/MAX13085E/MAX13088E are intended?Allow Up to 256
Transceivers on the Busfor half-duplex communications, and the MAX13080E/?Available
in Industry-Standard 8-Pin SO Package
MAX13081E/MAX13083E/MAX13084E/MAX13086E/MAX13087E are intended for full-duplex
communica-tions.
http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlThe
MAX13089E is selectable for half-duplex orfull-duplex operation. It also features
independentlyprogrammable receiver and transmitter output phasethrough separate
pins.
Ordering Information
The MAX13080E–MAX13089E transceivers draw 1.2mAof supply current when unloaded or
when fully loadedwith the drivers disabled. All devices have a 1/8-unitload receiver
input impedance, allowing up to 256transceivers on the bus.
The MAX13080E/MAX13083E/MAX13086E/MAX13089Eare available in 14-pin PDIP and 14-pin
SO packages.The MAX13081E/MAX13082E/MAX13084E/MAX13085E/MAX13087E/MAX13088E are
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available in 8-pin PDIP and8-pin SO packages. The devices operate over the com-mercial,
extended, and automotive temperature ranges.
Applications
Ordering Information continued at end of data sheet.
Utility MetersLighting SystemsIndustrial ControlSelector Guide, Pin Configurations,
and Typical OperatingCircuithttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmls
appear at end of data sheet.
TelecomSecurity SystemsInstrumentationProfibus
________________________________________________________________Maxim Integrated
Products1
For pricing, delivery, and ordering information,please contact Maxim/Dallas
Direct!at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
ABSOLUTE MAXIMUM RATINGS
(All Voltages Referenced to GND)
Supply Voltage (VCC).............................................................
6VControl Input Voltage (RE, DE, SLR,
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H/F,
TXP,
RXP)......................................................-0.3V
to
6VDriver Input Voltage (DI)...........................................-0.3V to
6VDriver
Output
Voltage
(Z,
Y,
A,
B).............................-8V
to
13VReceiver Input Voltage http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.html(A,
B)....................................-8V to
Full
Duplex
(A,
13VReceiver Input Voltage
B)..................................................-8V
13VReceiver Output Voltage (RO)....................-0.3V to (VCC
to
0.3V)Driver
Output Current.....................................................±250mA
Continuous Power Dissipation (TA=
70°C)
8-Pin SO (derate 5.88mW/°C above
70°C).................471mW8-Pin Plastic DIP
(derate 9.09mW/°C above
70°C).....727mW14-Pin SO (derate 8.33mW/°C above
70°C)...............667mW14-Pin
Plastic
DIP
(derate
10.0mW/°C
above
70°C)...800mWOperating Temperature Ranges
MAX1308_EC_
_.................................................0°C
MAX1308_EE_
85°CMAX1308_EA_
to
75°C
_..............................................-40°C
to
_............................................-40°C
to
125°CJunction Temperature......................................................
150°CSthttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlorage
Range.............................-65°C to
Temperature
150°CLead Temperature (soldering,
10s)................................. 300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only, and functionaloperation of the
device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure toabsolute maximum rating
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conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC=
VCC=
5.0V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at
5.0V and TA=
25°C.) (Note 1)
2_______________________________________________________________________________
________
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.html(VCC=
unless otherwise noted. Typical values are at VCC=
5.0V ±10%, TA= TMINto TMAX,
5.0V and TA=
25°C.) (Note 1)
________________________________________________________________________________
_______3
MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
DRIVER SWITCHING CHARACTERISTICS
MAX13080E/MAX13081E/MAX13082E/MAX13089E WITH SRL = UNCONNECTED (250kbps)
(VCC=
VCC=
5.0V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at
5.0V and TA=
25°C.)
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RECEIVER SWITCHING CHARACTERISTICS
MAX13080E/MAX13081E/MAX13082E/MAX13089E WITHSRL = UNCONNECTED (250kbps)
(VCC=
VCC=
5.0V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at
5.0V and TA=
25°C.)
4_______________________________________________________________________________
________
5.0V, ±http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.html15kV ESD-Protected,
Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
DRIVER SWITCHING CHARACTERISTICS
MAX13083E/MAX13084E/MAX13085E/MAX13089E WITHSRL = VCC(500kbps)
(VCC=
VCC=
5.0V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at
5.0V and TA=
25°C.)
RECEIVER SWITCHING CHARACTERISTICS
MAX13083E/MAX13084E/MAX13085E/MAX13089E WITHSRL = VCC(500kbps)
(VCC=
VCC=
5.0V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at
5.0V and TA=
25°C.)
________________________________________________________________________________
_______5
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MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
DRIVER SWITCHING CHARACTERISTICS
MAX13086E/MAX13087E/MAX13088E/MAX13089E WITHSRL = GND (16Mbps)
(VCC=
5.0V
±10%,
TA=
TMINto
TMAX,
unless
otherwise
noted.
Typhttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlical values are at VCC=
5.0V and TA=
25°C.)
RECEIVER SWITCHING CHARACTERISTICS
MAX13086E/MAX13087E/MAX13088E/MAX13089E WITHSRL = GND (16Mbps)
(VCC=
VCC=
5.0V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at
5.0V and TA=
25°C.)
Note 2:?VODand ?VOCare the changes in VODand VOC, respectively, when the DI input
changes state.
Note 3:The short-circuit output current applies to peak current just prior to foldback
current limiting. The short-circuit foldback output
current applies during current limiting to allow a recovery from bus contention.6
________________________________________________________________________________
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_______
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
(VCC=
5.0V, TA =
25°C, unless otherwise noted.)
OUTPUT CURRENT
OUTPUT CURRENT
SUPPLY
CURRENT
vs.
TEMPERAhttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlTURE
vs. RECEIVER OUTPUT-HIGH VOLTAGE
vs. RECEIVER OUTPUT-LOW VOLTAGE
1.60602
0703
0ccoott
EE1.50998-50E0608-E088003311))
X)
XA1.40AAAAmmMm50M(((
TT40TN1.30NNEEERRR40RRRUUC1.20UC
YTTLUU30PPP1.10USTU20PTUOO1.00200.9010100.80
C30
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-40-25-105203550658095110125
012345012345
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE (V)OUTPUT LOW VOLTAGE (V)
RECEIVER OUTPUT-HIGH VOLTAGE
RECEIVER OUTPUT-LOW VOLTAGE
DRIVER DIFFERENTIAL OUTPUT CURRENTvs. TEMPERATURE
vs. TEMPERATURE
vs. DIFFERENTIAL OUTPUT VOLTAGE
5.40.8160
0.7)A5.2m140( )
)
VT(VN(
E
0.6EG5.0ER120AGRTAULTC
100OL0.5TV4.8OU
TLUUAPP0.3I60TTU4.4TUNO0.2EORE40F4.2F0.1ID204.0
0-40-25-105203550658095110125
VH
PGWTIO0.4U80HLO
T4.6
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-40-25-1052035506580951101250
1
2
://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlar3
4
5
TEMPERATURE (°C)
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
DRIVER DIFFERENTIAL OUTPUTOUTPUT CURRENT vs. TRANSMITTER
OUTPUT CURRENT vs. TRANSMITTER
VOLTAGE vs. TEMPERATURE
OUTPUT-HIGH VOLTAGE
OUTPUT-LOW VOLTAGE
4.8200
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200180)
180V(4.4
E160G160A)
)
TAAL4.0Omm140(140(V
TT TNNUEE120
P3.6R120RTRRUUUC100OC100
LTTA3.2UUIP80P80TNTTEUUR2.8O60O60EFFI4040D2.420
202.0
-40-25-10
5203550658095110125-7-6-5-4-3
-2-10
1
2
34
5
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024681012
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE (V)
OUTPUT-LOW VOLTAGE (V)
________________________________________________________________________________
_______7
MAX13080E–MAX13089E
5.0V,
±15kV
Failhttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.html-Safe,
RS-485/RS-422 TransceiversMAX13080E–MAX13089E
(VCC=
5.0V, TA =
25°C, unless otherwise noted.)
SHUTDOWN CURRENTvs. TEMPERATURE
9SHUTDOWN CURRENT (?A)
876543210
-40-25-10
5203550658095110125TEMPERATURE (°C)
600
ESD-Protected,
Hot-Swap,
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-40-25-10
5203550658095110125TEMPERATURE (°C)
300
-40-25-105203550658095110125
TEMPERATURE (°C)
MAX13080E-89E toc10
DRIVER PROPAGATION DELAYvs. TEMPERATURE (250kbps)
DRIVER PROPAGATION DELAYvs. TEMPERATURE (500kbps)
101200DRIVER PROPAGATION DELAY (ns)1100
1000900800700
600DRIVER PROPAGATION DELAY (ns)
550500450400350
DRIVER PROPAGATION DELAYvs. TEMPERATURE (16Mbps)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (250kpbs AND 500kbps)
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RECEIVER PROPAGATION DELAY (ns)
160140120100806040200
-40-25-1http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.html0
5203550658095110125TEMPERATURE (°C)
RECEIVER PROPAGATION DELAYvs. TEMPERATURE (16Mbps)
180REC
EIVER PROPAGA
TION DELAY (ns)
160140120100806040200
-40-25-105203550658095110125
TEMPERATURE (°C)
80
DRIVER PROPAGATION DELAY (ns)
706050403020100
-40-25-10
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180
5203550658095110125TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (250kbps)
RECEIVER PROPAGATION DELAY
(250kbps AND 500kbps)
DI2V/div
VA - VB5V/div
VY - VZ5V/div
RO2V/div
2?s/div200ns/div
8_______________________________________________________________________________
________
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
(VCC=
5.0V, TA =
25°C, unless otherwise noted.)
DRIVER PROPAGATION DELAY (500kbps)
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DRIVER
PROPAGAThttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlION
DELAY
(16Mbps)
RECEIVER PROPAGATION DELAY (16Mbps)
VBDIDI2V/div
2V/div
2V/div
VAV2V/div
Z2V/div
VY - VZ5V/div
ROVY2V/div
2V/div
400ns/div
10ns/div40ns/div
Figure 2. Driver Timing Test Circuit
________________________________________________________________________________
_______9
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MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
Figure 4. Driver Enable and Disable Times (tDHZ, tDZH, tDZH(SHDN))
DZLDLZDLZ(SHDN)10
________________________________________________________________________________
______
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
Figure 6. Receiver Propagation Delay Test Circuit
_____________________________________________________________http://doc.wendoc.c
om/b2be828f3f110692c7ce0fc0d.html_________________________
11
MAX13080E–MAX13089E
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
MAX13080E–MAX13089E
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
Function Tables
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MAX13080E/MAX13083E/MAX13086E
MAX13081E/MAX13084E/MAX13086E/MAX13087E
________________________________________________________________________________
______13
MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
Function Tables (continued)
MAX13082E/MAX13085E/MAX13088E
MAX13089E
14______________________________________________________________________________
________
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
than
or
equal
to
-200mV,
RO
is
cahttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlse
logic-low.
of
In
the
aThe
MAX13080E–MAX13089E high-speed transceiversterminated bus with all transmitters
disabled, the receiv-for RS-485/RS-422 communication contain one driverer’s
differential input voltage is pulled to 0V by the termi-and one receiver. These
devices feature fail-safe circuit-nation. With the receiver thresholds of the
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MAX13080Ery, which guarantees a logic-high receiver output whenfamily, this results
in a logic-high with a 50mV minimumthe receiver inputs are open or shorted, or when
they arenoise margin. Unlike previous fail-safe devices, theconnected to a terminated
transmission line with all dri--50mV to -200mV threshold complies with the
±200mVvers disabled (see the Fail-Safesection). TheEIA/TIA-485 standard.
MAX13080E/MAX13082E/MAX13083E/MAX13085E/MAX13086E/MAX13088E/MAX13089E
also
feature a hot-Hot-Swap Capability (Except
swap
capability
allowing
line
insertion
without
erroneousMAX13081E/MAX13084E/MAX13087Ehttp://doc.wendoc.com/b2be828f3f110692c7ce
0fc0d.html)
data transfer (see the Hot Swap Capabilitysection). TheHot-Swap Inputs
MAX13080E/MAX13081E/MAX13082E feature reducedWhen circuit boards are inserted into
a hot or poweredslew-rate drivers that minimize EMI and reduce reflec-backplane,
differential disturbances to the data bustions caused by improperly terminated cables,
allowingcan lead to data errors. Upon initial circuit board inser-error-free data
transmission up to 250kbps. Thetion, the data communication processor undergoes
itsMAX13083E/MAX13084E/MAX13085E also offer slew-own power-up sequence. During this
period, therate limits allowing transmit speeds up to 500kbps. Theprocessor’s
logic-output drivers are high impedanceMAX13086E/MAX13087E/MAX13088Es’ driver slew
ratesand are unable to drive the DE and REinputs of theseare not limited, making
transmit speeds up to 16Mbpsdevices to a defined logic level. Leakage currents up
topossible.
The
MAX13089E’s
slew
rathttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmle is selectable±10?A from
the high-impedance state of the proces-between 250kbps, 500kbps, and 16Mbps by
driving asor’s logic drivers could cause standard CMOS enableselector pin with a
three-state driver.
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inputs
of
a
transceiver
to
drift
to
an
incorrect
logic
level.The
MAX13082E/MAX13085E/MAX13088E are half-Additionally, parasitic circuit board
capacitance couldduplex transceivers, while the MAX13080E/MAX13081E/cause coupling
of
VCCor
GND
to
the
enable
inputs.MAX13083E/MAX13084E/MAX13086E/MAX13087E
areWithout the hot-swap capability, these factors couldfull-duplex transceivers. The
MAX13089E is selectableimproperly enable the transceiver’s driver or receiver.
between half- and full-duplex communication by drivingWhen Va selector pin (H/F) high
or low, respectively.
low and CCrises, an internal pulldown circuit holds DEREhigh. After the initial
power-up
sequence,All
devices
operate
from
a
single
5.0V
supply.
Drivershttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlthe pulldown circuit
becomes transparent, resetting theare output short-circuit current limited.
Thermal-shutdownhot-swap tolerable input.
circuitry protects drivers against excessive power dissi-Hot-Swap Input Circuitry
pation. When activated, the thermal-shutdown circuitryThe enable inputs feature
hot-swap capability. At theplaces the driver outputs into a high-impedance state.
input there are two NMOS devices, M1 and M2 Receiver Input Filtering
(Figure 9). When VCCramps from zero, an internal 7?sThe receivers of the
MAX13080E–MAX13085E, and thetimer turns on M2 and sets the SR latch, which
alsoMAX13089E when operating in 250kbps or 500kbpsturns on M1. Transistors M2, a 1.5mA
current sink, andmode, incorporate input filtering in addition to inputM1, a 500?A
current sink, pull DE to GND through ahysteresis. This filtering enhances noise
immunity
with5k?resistor.
M2
is
designed
to
pull
DE
to
the
dishttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlableddifferential signals
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that have very slow rise and fallstate against an external parasitic capacitance up
totimes. Receiver propagation delay increases by 25_0pF that can drive DE high. After
7?s, the timerdue to this filtering.
deactivates M2 while M1 remains on, holding DE lowagainst three-state leakages that
can drive DE high. M1Fail-Safe
remains on until an external source overcomes theThe MAX13080E family guarantees a
logic-high receiverrequired input current. At this time, the SR latch resetsoutput
when the receiver inputs are shorted or open, orand M1 turns off. When M1 turns off,
DE reverts to awhen they are connected to a terminated transmissionstandard,
high-impedance CMOS input. Whenever Vline with all drivers disabled. This is done
by setting thedrops below 1V, the hot-swap input is reset.
CCreceiver input threshold between -50mV and -200mV. IfFor REthere is a complementary
circuit
employing
http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmltwothe
differential receiver input voltage (A - B) is greaterPMOS devices pulling REto VCC.
than or equal to -50mV, RO is logic-high. If (A - B) is less
________________________________________________________________________________
______15
MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
tion. Drive H/Fhigh for half-duplex operation. In full-duplex mode, the pin
configuration of the driver andreceiver is the same as that of a MAX13080E. In
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half-duplex mode, the receiver inputs are internally connect-ed to the driver outputs
through a resistor-divider. Thiseffectively changes the function of the device’s
outputs.Y becomes the noninverting driver output and receiverinput, Z becomes the
inverting driver output and receiverinput. In half-duplex mode, A and B are still
connected
toground
through
an
internal
resistor-divider
http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlthey
arenot
but
internally
connected to the receiver.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structuresare incorporated on all pins to
protect against electro-static discharges encountered during handling andassembly.
The driver outputs and receiver inputs of theMAX13080E family of devices have extra
protectionagainst
static
electricity.
Maxim’s
engineers
have
devel-oped
state-of-the-art structures to protect these pinsagainst ESD of ±15kV without damage.
The ESD struc-tures withstand high ESD in all states: normal operation,shutdown, and
powered down. After an ESD event, theMAX13080E–MAX13089E keep working without
latchupor damage.
ESD protection can be tested in various ways. Thetransmitter outputs and receiver
inputs of theMAX13080E–MAX13089E are characterized for protec-tion to the following
limits:
?±15kV using the Human Body Model
?±6kV
using
the
Contact
http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlmethod
61000-4-2
ESD Test Conditions
Discharge
specifiedin
IEC
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ESD performance depends on a variety of conditions.Contact Maxim for a reliability
report that documentstest setup, test methodology, and test results.
Human Body Model
Figure 10a shows the Human Body Model, and Figure10b shows the current waveform it
generates when dis-charged into a low impedance. This model consists of a100pF
capacitor charged to the ESD voltage of interest,which is then discharged into the
test device through a1.5k?resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing andperformance of finished equipment.
However, it doesnot specifically refer to integrated circuits. TheMAX13080E family
of devices helps you design equip-ment to meet IEC 61000-4-2, without the need for
addi-tional ESD-protection components.
MAX13089E Programming
The
MAX13089E
has
several
operatinghttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlmodes.
programmable
Transmitter
rise and fall times are programma-ble, resulting in maximum data rates of
250kbps,500kbps, and 16Mbps. To select the desired data rate,drive SRL to one of three
possible states by using athree-state driver: VCC, GND, or unconnected. For250kbps
operation, set the three-state device in high-impedance mode or leave SRL unconnected.
For500kbps operation, drive SRL high or connect it to VCC.For 16Mbps operation, drive
SRL low or connect it toGND. SRL can be changed during operation withoutinterrupting
data communications.
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Occasionally, twisted-pair lines are connected backwardfrom normal orientation. The
MAX13089E has two pinsthat invert the phase of the driver and the receiver to cor-rect
this problem. For normal operation, drive TXP andRXP low, connect them to ground,
or leave them uncon-nected (internal pulldown). To invert the driver phase,drive TXP
high
or
connect
it
to
VCC.
To
invert
the
receiverphase,
drihttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlve RXP high or connect it to
VCC. Note that thereceiver threshold is positive when RXP is high.
The MAX13089E can operate in full- or half-duplexmode. Drive H/Flow, leave it
unconnected (internalpulldown), or connect it to GND for full-duplex opera-16
________________________________________________________________________________
______
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
The major difference between tests done using theHuman Body Model and IEC 61000-4-2
is higher peakcurrent in IEC 61000-4-2 because series resistance is256 Transceivers
on the Bus
lower in the IEC 61000-4-2 model. Hence, the ESD with-The standard RS-485 receiver
input impedance is 12k?stand voltage measured to IEC 61000-4-2 is generally(1-unit
load), and the standard driver can drive up to 32-lower than that measured using the
Human
Body
Model.unit
loads.
The
MAX13080E
family
of
transhttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlceivers has aFigure 10c
shows the IEC 61000-4-2 model, and Figure1/8-unit load receiver input impedance
(96k?), allowing10d shows the current waveform for IEC 61000-4-2 ESDup to 256
transceivers to be connected in parallel on oneContact Discharge test.
communication line. Any combination of these devices,Machine Model
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as well as other RS-485 transceivers with a total of 32-The machine model for ESD
tests all pins using aunit loads or fewer, can be connected to the line.
200pF storage capacitor and zero discharge resis-Reduced EMI and Reflections
tance.
The
objective
is
to
emulate
the
stress
causedThe
MAX13080E/MAX13081E/MAX13082E featurewhen I/O pins are contacted by handling
equipmentreduced slew-rate drivers that minimize EMI andduring test and assembly.
Of course, all pins requirereduce reflections caused by improperly terminatedthis
protection, not just RS-485 inputs and outputs.
cableshttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.html, allowing error-free
data transmission up to250kbps. The MAX13083E/MAX13084E/MAX13085Eoffer higher
driver output slew-rate limits, allowingtransmit speeds up to 500kbps. The MAX13089E
withSRL = VCCor unconnected are slew-rate limited. WithSRL unconnected, the MAX13089E
error-free datatransmission is up to 250kbps. With SRL connected toVCC,the data
transmit speeds up to 500kbps.
________________________________________________________________________________
______
17
MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
TransceiversMAX13080E–MAX13089E
Low-Power Shutdown Mode (ExceptMAX13081E/MAX13084E/MAX13087E)
RS-485/RS-422
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Low-power shutdown mode is initiated by bringing bothREhigh and DE low. In shutdown,
the devices typicallydraw only 2.8?A of supply current.
REand DE can be driven simultaneously; the devicesare guaranteed not to enter shutdown
if REis http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlhigh andDE is low for
less than 50ns. If the inputs are in thisstate for at least 700ns, the devices are
guaranteed toenter shutdown.
Enable times tZHand tZL(see the SwitchingCharacteristics section) assume the devices
were not ina low-power shutdown state. Enable times tZH(SHDN)andtZL(SHDN)assume the
devices were in shutdown state. Ittakes drivers and receivers longer to become
enabledfrom
low-power
shutdown
mode
(tZH(SHDN),
tZL(SHDN))than
from
driver/receiver-disable mode (tZH, tZL).
Driver Output Protection
Two mechanisms prevent excessive output current andpower dissipation caused by faults
or by bus contention.The first, a foldback current limit on the output stage,provides
immediate protection against short circuits overthe whole common-mode voltage range
(see the TypicalOperating Characteristics). The second, a thermal-shut-down circuit,
forces
the
driver
outputs
into
a
high-imped-ance
dihttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmle
state
temperature
if
the
exceeds
175°C (typ).
Line Length
The RS-485/RS-422 standard covers line lengths up to4000ft. For line lengths greater
than 4000ft, use therepeater application shown in Figure 11.
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Typical Applications
The
MAX13082E/MAX13085E/MAX13088E/MAX13089Etransceivers
are
designed
for
bidirectional data commu-nications on multipoint bus transmission lines. Figures12
and 13 show typical network applications circuits. To minimize reflections, terminate
the line at both endsin its characteristic impedance, and keep stub lengthsoff the
main line as short as possible. The slew-rate-lim-ited MAX13082E/MAX13085E and the
two modes of theMAX13089E are more tolerant of imperfect termination.
Chip Information
TRANSISTOR COUNT: 1228PROCESS: BiCMOS
Figure 11. Line Repeater for MAX13080E/MAX13081E/
MAX13083E/MAX13084E/MAX13086E/MAX13087E/MAX13089E in Full-Duplex Mode
http://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.html18
________________________________________________________________________________
______
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
________________________________________________________________________________
______19
MAX13080E–MAX13089E
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
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MAX13080E–MAX13089E
5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
________________________________________________________________________________
______21
MAX13080E–MAX13089E
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
Ordering Information (continued)
22______________________________________________________________________________
________
5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/Rhttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlS-422 Transceivers
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current
specifications. For the latest package outline information,go to .)
________________________________________________________________________________
______23
MAX13080E–MAX13089E
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5.0V,
±15kV
ESD-Protected,
Fail-Safe,
Hot-Swap,
RS-485/RS-422
TransceiversMAX13080E–MAX13089E
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current
specifications. For the latest package outline information,go to .)
Maxim cannot assume responsibility for use of any circuitry other than circuitry
entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim
reserves the right to change the circuitry and specifications without notice at any
time.
Maxim
Integrated
Products,
120
San
Gabhttp://doc.wendoc.com/b2be828f3f110692c7ce0fc0d.htmlriel Drive, Sunnyvale, CA
94086 408-737-7600 ____________________24?2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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