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IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER
FEATURES:
DESCRIPTION:
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•
•
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The IDT octal bidirectional transceivers are built using an advanced dual
metal CMOS technology. The FCT245T is designed for asynchronous twoway communication between data buses. The transmit/receive (T/R) input
determines the direction of data flow through the bidirectional transceiver.
Transmit (active high) enables data from A ports to B ports, and receive
(active low) from B ports to A ports. The output enable (OE) input, when
high, disables both A and B ports by placing them in high Z condition.
•
•
•
•
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Std., A, and C grades
Low input and output leakage ≤1µA (max.)
CMOS power levels
True TTL input and output compatibility:
– VOH = 3.3V (typ.)
– VOL = 0.3V (typ.)
High Drive outputs (-15mA IOH, 64mA IOL)
Meets or exceeds JEDEC standard 18 specifications
Military product compliant to MIL-STD-883, Class B and DESC
listed (dual marked)
Power off disable outputs permit "live insertion"
Available in the following packages:
– Industrial: SOIC, SSOP, QSOP, TSSOP
– Military: CERDIP, LCC
FUNCTIONAL BLOCK DIAGRAM
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
SEPTEMBER 2009
1
© 2009 Integrated Device Technology, Inc.
DSC-5510/6
IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
3
18
B0
4
17
A2
B1
A3
5
16
B2
A4
6
15
B3
A5
7
14
B4
A6
8
13
B5
A7
9
12
B6
10
11
B7
GND
3
2
1
19
18
B0
A2
A3
5
17
B1
A4
6
16
B2
A5
7
15
B3
A6
8
14
B4
9
10
11
12
13
LCC
TOP VIEW
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS(1)
Description
20
4
CERDIP/ SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
Symbol
OE
A1
B5
OE
VCC
19
B6
2
T/R
A0
INDEX
B7
VCC
A0
20
GND
1
A7
T/R
A1
PIN CONFIGURATION
Max
Unit
Pin Names
VTERM(2) Terminal Voltage with Respect to GND
–0.5 to +7
V
OE
VTERM(3) Terminal Voltage with Respect to GND
Description
Output Enable Inputs (Active LOW)
–0.5 to VCC+0.5
V
T/R
TSTG
Storage Temperature
–65 to +150
°C
A0 - A7
Side A Inputs or 3-State Outputs
IOUT
DC Output Current
–60 to +120
mA
B0 - B7
Side B Inputs or 3-State Outputs
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability. No terminal voltage may exceed
Vcc by +0.5V unless otherwise noted.
2. Inputs and Vcc terminals only.
3. Output and I/O terminals only.
FUNCTION TABLE(1)
Inputs
OE
L
L
H
CAPACITANCE (TA = +25°C, F = 1.0MHz)
Symbol
Parameter(1)
Conditions
Typ.
Max.
Input Capacitance
VIN = 0V
6
10
pF
COUT
Output Capacitance
VOUT = 0V
8
12
pF
T/R
L
H
X
NOTE:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
Z = High Impedance
Unit
CIN
Transmit/Recieve Input
NOTE:
1. This parameter is measured at characterization but not tested.
2
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%; Military: TA = –55°C to +125°C, VCC = 5.0V ±10%
Symbol
Test Conditions(1)
Parameter
Min.
Typ.(2)
Max.
Unit
VIH
Input HIGH Level
Guaranteed Logic HIGH Level
2
—
—
V
VIL
Input LOW Level
Guaranteed Logic LOW Level
—
—
0.8
V
IIH
Input HIGH Current(4)
VCC = Max.
VI = 2.7V
—
—
±1
µA
IIL
Input LOW Current(4)
VCC = Max.
VI = 0.5V
—
—
±1
µA
IOZH
High Impedance Output Current
VCC = Max
VO = 2.7V
—
—
±1
µA
IOZL
(3-State output pins)(4)
VO = 0.5V
—
—
±1
II
VIK
VH
Input HIGH Current(4)
Clamp Diode Voltage
Input Hysteresis
VCC = Max., VI = VCC (Max.)
VCC = Min, IIN = -18mA
—
—
—
—
–0.7
200
±1
–1.2
—
µA
V
mV
ICC
Quiescent Power Supply Current
VCC = Max., VIN = GND or VCC
—
0.01
1
mA
Min.
2.4
Typ.(2)
3.3
Max.
—
Unit
2
3
—
—
0.3
0.55
V
–60
–120
–225
mA
—
OUTPUT DRIVE CHARACTERISTICS
Symbol
VOH
Parameter
Output HIGH Voltage
VOL
Output LOW Voltage
IOS
Short Circuit Current
Test Conditions(1)
VCC = Min
IOH = –6mA MIL
IOH = –8mA IND
VIN = VIH or VIL
IOH = –12mA MIL
IOH = –15mA IND
VCC = Min
IOL = 48mA MIL
VIN = VIH or VIL
IOL = 64mA IND
VCC = Max., VO = GND(3)
V
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. The test limit for this parameter is ±5µA at TA = –55°C.
3
IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
—
0.5
2
mA
VIN = VCC
VIN = GND
—
0.15
0.25
mA/
MHz
VCC = Max.
Outputs Open
fi = 10MHz
VIN = VCC
VIN = GND
—
1.5
3.5
mA
50% Duty Cycle
OE = T/R = GND
One Bit Toggling
VIN = 3.4V
VIN = GND
—
1.8
4.5
VCC = Max.
Outputs Open
fi = 2.5MHz
VIN = VCC
VIN = GND
—
3
6(5)
50% Duty Cycle
OE = T/R = GND
Eight Bits Toggling
VIN = 3.4V
VIN = GND
—
5
14(5)
Symbol
Parameter
ΔICC
Quiescent Power Supply Current
TTL Inputs HIGH
VCC = Max.
VIN = 3.4V(3)
ICCD
Dynamic Power Supply
Current(4)
VCC = Max.
Outputs Open
OE = T/R = GND
One Input Toggling
50% Duty Cycle
Total Power Supply Current(6)
IC
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input; (VIN = 3.4V). All other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of ΔICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fCP/2+ fiNi)
ICC = Quiescent Current
ΔICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fi = Output Frequency
Ni = Number of Outputs at fi
All currents are in milliamps and all frequencies are in megahertz.
4
IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
74FCT245AT
Min.(2)
Max.
1.5
4.6
Condition(1)
CL = 50pF
RL = 500Ω
Parameter
Propagation Delay
A to B, B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
Output Enable Time
T/R to A or B(3)
Output Disable Time
T/R to A or B(3)
74FCT245CT
Min.(2)
Max.
1.5
4.1
Unit
ns
1.5
6.2
1.5
5.8
ns
1.5
5
1.5
4.8
ns
1.5
6.2
1.5
5.8
ns
1.5
5
1.5
4.8
ns
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
Parameter
Propagation Delay
A to B, B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
Output Enable Time
T/R to A or B(3)
Output Disable Time
T/R to A or B(3)
Condition(1)
CL = 50pF
RL = 500Ω
54FCT245T
Min.(2)
Max.
1.5
7.5
54FCT245AT
Min.(2)
Max.
1.5
4.9
54FCT245CT
Min.(2)
Max.
1.5
4.5
Unit
ns
1.5
10
1.5
6.5
1.5
6.2
ns
1.5
10
1.5
6
1.5
5.2
ns
1.5
10
1.5
6.5
1.5
6.2
ns
1.5
10
1.5
6
1.5
5.2
ns
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not tested.
5
IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
V CC
SWITCH POSITION
7.0V
500W
V OUT
VIN
Pulse
Generator
D.U.T
.
50pF
RT
500W
Test
Switch
Open Drain
Disable Low
Enable Low
Closed
All Other Tests
Open
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
CL
Octal Link
Test Circuits for All Outputs
DATA
INPUT
tH
tSU
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
tREM
tSU
3V
1.5V
0V
3V
1.5V
0V
LOW-HIGH-LOW
PULSE
1.5V
tW
3V
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
3V
1.5V
0V
tH
Pulse Width
Octal Link
Octal Link
Set-Up, Hold, and Release Times
ENABLE
SAME PHASE
INPUT TRANSITION
tPLH
tPHL
OUTPUT
tPLH
OPPOSITE PHASE
INPUT TRANSITION
tPHL
3V
1.5V
0V
VOH
1.5V
VOL
DISABLE
3V
1.5V
0V
CONTROL
INPUT
tPZL
OUTPUT
NORMALLY
LOW
3V
1.5V
0V
SWITCH
CLOSED
tPLZ
3.5V
1.5V
tPZH
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
3.5V
0.3V
VOL
tPHZ
0.3V
1.5V
0V
Octal Link
VOH
0V
Octal Link
Propagation Delay
Enable and Disable Times
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
6
IDT54/74FCT245T/AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
ORDERING INFORMATION
XXXX
XX
FCT
Device
Type
Temp. Range
XX
Package
X
Process
Blank
B
Industrial
MIL-STD-883, Class B
SOG
PYG
QG
PGG
Industrial Options
Small Outline IC - Green
Shrink Small Outline Package - Green
Quarter-size Small Outline Package - Green
Thin Shrink Small Outline Package - Green
D
L
Military Options
CERDIP
Leadless Chip Carrier
245T
245AT
245CT
54
74
Fast CMOS Octal Bidirectional Transceiver
55 C to +125 C
40 C to +85 C
Datasheet Document History
09/29/09 Pg. 7
Updated the ordering information by removing the "IDT" notation and non RoHS part.
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
7
for Tech Support:
[email protected]