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AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS114C – JANUARY 1979 – REVISED MAY 1995
•
•
•
•
•
•
Meets or Exceeds the Requirements of
ANSI EIA / TIA-422-B and ITU
Recommendation V.11
Operates From a Single 5-V Supply
TTL Compatible
Complementary Outputs
High Output Impedance in Power-Off
Conditions
Complementary Output Enable Inputs
D OR N PACKAGE
(TOP VIEW)
1A
1Y
1Z
G
2Z
2Y
2A
GND
description
The AM26LS31C is a quadruple complementaryoutput line driver designed to meet the
requirements of ANSI EIA / TIA-422-B and ITU
(formerly CCITT) V.11. The 3-state outputs have
high-current capability for driving balanced lines
such as twisted-pair or parallel-wire transmission
lines, and they provide a high-impedance state in
the power-off condition. The enable function is
common to all four drivers and offers the choice of
an active-high or active-low enable input.
Low-power Schottky circuitry reduces power
consumption without sacrificing speed.
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
4A
4Y
4Z
G
3Z
3Y
3A
FUNCTION TABLE
(each driver)
ENABLES
INPUT
A
H
L
H
L
X
H = high level
L = low level
OUTPUTS
G
G
Y
Z
H
H
X
X
L
X
X
L
L
H
H
L
H
L
Z
L
H
L
H
Z
X = irrelevant
Z = high impedance (off)
The AM26LS31C is characterized for operation
from 0°C to 70°C.
logic symbol†
G
G
4
12
logic diagram (positive logic)
≥1
G
EN
G
1A
1A
2A
3A
4A
1
7
9
15
2
3
6
5
10
11
14
13
4
12
1
1Y
1Z
2A
7
2Y
2Z
3A
9
2
3
6
5
10
11
3Y
3Z
4Y
4A
15
14
13
1Y
1Z
2Y
2Z
3Y
3Z
4Y
4Z
4Z
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Copyright  1995, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–1
AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS114C – JANUARY 1979 – REVISED MAY 1995
schematic (each driver)
Input A
V
22 kΩ
9Ω
Output Y
Common to All Four Drivers
VCC
V
22 kΩ
22 kΩ
To Three
Other
Drivers
Enable G
Enable G
GND
All resistor values are nominal.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Output off-state voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values, except differential output voltage VOD, are with respect to network GND.
2–2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS114C – JANUARY 1979 – REVISED MAY 1995
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
D
N
950 mW
1150 mW
7.6 mW/°C
9.2 mW/°C
608 mW
736 mW
recommended operating conditions
Supply voltage, VCC
High-level input voltage, VIH
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
2
V
Low-level input voltage, VIL
High-level output current, IOH
Low-level output current, IOL
Operating free-air temperature, TA
0
0.8
V
– 20
mA
20
mA
70
°C
electrical characteristics over operating free-air temperature range (unless otherwise noted)
PARAMETER
VIK
VOH
Input clamp voltage
VOL
TEST CONDITIONS
High-level output voltage
VCC = 4.75 V,
VCC = 4.75 V,
II = – 18 mA
IOH = – 20 mA
Low-level output voltage
VCC = 4.75 V,
IOL = 20 mA
VO = 0.5 V
IOZ
Off-state (high-impedance-state) output current
VCC = 4
4.75
75 V
II
IIH
Input current at maximum input voltage
High-level input current
VCC = 5.25 V,
VCC = 5.25 V,
IIL
Low-level input current
VCC = 5.25 V,
IOS
Short-circuit output current‡
VCC = 5.25 V
MIN
TYP†
MAX
UNIT
– 1.5
V
2.5
V
0.5
– 20
VO = 2.5 V
VI = 7 V
20
VI = 2.7 V
VI = 0.4 V
– 30
ICC
Supply current
VCC = 5.25 V, All outputs disabled
32
† All typical values are at VCC = 5 V and TA = 25°C.
‡ Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second.
V
µA
0.1
mA
20
µA
– 0.36
mA
– 150
mA
80
mA
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER
tPLH
tPHL
TEST CONDITIONS
Propagation delay time, low-to-high-level output
Propagation delay time, high-to-low-level output
MIN
TYP
MAX
14
20
UNIT
ns
14
20
ns
CL = 30 pF
pF,
See Figure 1
S1 and S2 open,
open
1
6
ns
RL = 75 Ω,
25
40
ns
Output-to-output skew
tPZH
Output enable time to high level
CL = 30 pF,
See Figure 1
tPZL
Output enable time to low level
CL = 30 pF,
See Figure 1
RL = 180 Ω,
37
45
ns
tPHZ
tPLZ
Output disable time from high level
CL = 10 p
pF,,
See Figure 1
S1 and S2 closed,,
21
30
ns
23
35
ns
Output disable time from low level
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–3
AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS114C – JANUARY 1979 – REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
Test Point
3V
VCC
180 Ω
Input A
(see Notes B
and C)
S1
1.3 V
1.3 V
0V
tPHL
tPLH
VOH
Output Y
From Output
Under Test
1.5 V
Skew
75 Ω
CL
(see Note A)
Skew
tPLH
tPHL
S2
VOH
1.5 V
Output Z
TEST CIRCUIT
Enable G
(see Note D)
VOL
PROPAGATION DELAY TIMES AND SKEW
3V
1.5 V
1.5 V
See Note D
0V
Enable G
tPLZ
tPZL
≈ 4.5 V
Waveform 1
(see Note E)
VOL
S1 Closed
S2 Open
S1 Closed
S2 Closed
≈ 1.5 V
VOL
1.5 V
0.5 V
tPHZ
tPZH
Waveform 2
(see Note E)
S1 Open
S2 Closed
0.5 V
VOH
≈ 1.5 V
1.5 V
≈0 V
S1 Closed
S2 Closed
ENABLE AND DISABLE TIME WAVEFORMS
NOTES: A.
B.
C.
D.
E.
CL includes probe and jig capacitance.
All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO ≈ 50 Ω, tr ≤ 15 ns, and tf ≤ 6 ns.
When measuring propagation delay times and skew, switches S1 and S2 are open.
Each enable is tested separately.
Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
Figure 1. Test Circuit and Voltage Waveforms
2–4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS114C – JANUARY 1979 – REVISED MAY 1995
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE
vs
ENABLE G INPUT VOLTAGE
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
Load = 470 Ω to GND
See Note A
TA = 25°C
VO – Y Output Voltage – V
3
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎÎÎÎ ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
4
VCC = 5 V
Load = 470 Ω to GND
See Note A
VCC = 5.25 V
VCC = 5 V
VO – Y Output Voltage – V
4
OUTPUT VOLTAGE
vs
ENABLE G INPUT VOLTAGE
VCC = 4.75 V
2
1
0
3
TA = 0°C
TA = 25°C
2
1
0
0
1
2
VI – Enable G Input Voltage – V
3
0
1
2
VI – Enable G Input Voltage – V
Figure 2
ÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
VCC = 5 V
VCC = 4.75 V
4
3
2
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
6
VCC = 5 V
Load = 470 Ω to VCC
See Note B
5
VO – Output Voltage – V
VO – Output Voltage – V
5
OUTPUT VOLTAGE
vs
ENABLE G INPUT VOLTAGE
Load = 470 Ω to VCC
See Note B
TA = 25°C
VCC = 5.25 V
3
Figure 3
OUTPUT VOLTAGE
vs
ENABLE G INPUT VOLTAGE
6
TA = 70°C
4
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
TA = 70°C
3
TA = 25°C
2
ÎÎÎÎ
TA = 0°C
1
1
0
0
1
2
VI – Enable G Input Voltage – V
3
0
0
Figure 4
1
2
VI – Enable G Input Voltage – V
3
Figure 5
NOTES: A. The A input is connected to V CC during the testing of the Y outputs and to ground during testing of the Z outputs.
B. The A input is connected to ground during the testing of the Y outputs and to VCC during the testing of the Z outputs.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–5
AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS114C – JANUARY 1979 – REVISED MAY 1995
TYPICAL CHARACTERISTICS
HIGH-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
ÁÁ
ÁÁ
ÁÁ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
VCC = 5 V
See Note A
4
VCC = 5.25 V
IOH = – 20 mA
3
IOH = – 40 mA
2
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
4
VOH
V
OH – High-Level Output Voltage – V
V
VOH
OH – High-Level Output Voltage – V
5
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
VCC = 5 V
3
VCC = 4.75 V
2
ÁÁÎÎÎÎÎ
ÁÁ
ÁÁÎÎÎÎÎ
1
0
1
TA = 25°C
See Note A
0
0
10
20
30
40
50
60
70
80
0
TA – Free-Air Temperature – °C
– 20
– 40
– 60
– 80
IOH – High-Level Output Current – mA
Figure 6
Figure 7
LOW-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
ÁÁ
ÁÁ
ÁÁ
0.4
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÁÁÁ
ÁÁÁ
ÁÁÁ
1
VCC = 5 V
IOL = 40 mA
See Note B
TA = 25°C
See Note B
0.9
V
VOL
OL – Low-Level Output Voltage – V
V
VOL
OL – Low-Level Output Voltage – V
0.5
0.3
0.2
0.1
0.8
0.7
0.6
VCC = 4.75 V
0.5
0.4
VCC = 5.25 V
0.3
0.2
0.1
0
0
0
50
25
TA – Free-Air Temperature – °C
75
0
20
40
60
80
100
IOL – Low-Level Output Current – mA
Figure 8
Figure 9
NOTES: A. The A input is connected to VCC during the testing of the Y outputs and to ground during testing of the Z outputs.
B. The A input is connected to ground during the testing of the Y outputs and to VCC during the testing of the Z inputs.
2–6
– 100
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
120
AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS114C – JANUARY 1979 – REVISED MAY 1995
TYPICAL CHARACTERISTICS
Y OUTPUT VOLTAGE
vs
DATA INPUT VOLTAGE
ÎÎÎÎ
ÎÎÎÎ
No Load
TA = 25°C
VO – Y Output Voltage – V
4
5
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
4
VCC = 5.25 V
VCC = 5 V
VCC = 4.75 V
3
ÎÎÎÎ
ÎÎÎÎ
No Load
2
1
VO – Y Output Voltage – V
5
Y OUTPUT VOLTAGE
vs
DATA INPUT VOLTAGE
3
ÎÎÎÎ
ÎÎÎÎ
TA = 25 °C
2
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
TA = 70°C
TA = 0°C
1
0
0
0
1
2
VI – Data Input Voltage – V
3
0
Figure 10
1
2
VI – Data Input Voltage – V
3
Figure 11
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2–7
2–8
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IMPORTANT NOTICE
Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor
product or service without notice, and advises its customers to obtain the latest version of relevant information
to verify, before placing orders, that the information being relied on is current.
TI warrants performance of its semiconductor products and related software to the specifications applicable at
the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are
utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each
device is not necessarily performed, except those mandated by government requirements.
Certain applications using semiconductor products may involve potential risks of death, personal injury, or
severe property or environmental damage (“Critical Applications”).
TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED
TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS.
Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI
products in such applications requires the written approval of an appropriate TI officer. Questions concerning
potential risk applications should be directed to TI through a local SC sales office.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards should be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein. Nor does TI warrant or represent that any license, either
express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property
right of TI covering or relating to any combination, machine, or process in which such semiconductor products
or services might be or are used.
Copyright  1995, Texas Instruments Incorporated