AM26LS31C QUADRUPLE DIFFERENTIAL LINE DRIVER

AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER

• Meets or Exceeds the Requirements of SLLS114C – JANUARY 1979 – REVISED MAY 1995

ANSI EIA / TIA-422-B and ITU D OR N PACKAGE
Recommendation V.11 (TOP VIEW)

• Operates From a Single 5-V Supply 1A 1 16 VCC
• TTL Compatible 1Y 2 15 4A
• Complementary Outputs 1Z 3 14 4Y
• High Output Impedance in Power-Off G 4 13 4Z
2Z 5 12 G
Conditions 2Y 6 11 3Z
2A 7 10 3Y
• Complementary Output Enable Inputs GND 8 9 3A

description FUNCTION TABLE
(each driver)
The AM26LS31C is a quadruple complementary-
output line driver designed to meet the INPUT ENABLES OUTPUTS
requirements of ANSI EIA / TIA-422-B and ITU A
(formerly CCITT) V.11. The 3-state outputs have GG YZ
high-current capability for driving balanced lines H
such as twisted-pair or parallel-wire transmission L HX HL
lines, and they provide a high-impedance state in H HX LH
the power-off condition. The enable function is L XL HL
common to all four drivers and offers the choice of X XL LH
an active-high or active-low enable input. LH ZZ
Low-power Schottky circuitry reduces power H = high level
consumption without sacrificing speed. L = low level X = irrelevant
Z = high impedance (off)
The AM26LS31C is characterized for operation
from 0°C to 70°C. logic diagram (positive logic)

logic symbol† 4
G
4 ≥1
G EN 12
G
12 2
G 1 1Y
1A
1 2 3
1A 1Y 7 1Z
2A
7 3 6
2A 1Z 9 2Y
3A
9 6 5
3A 2Y 15 2Z
4A
15 5 10
4A 2Z 3Y

10 11
3Y 3Z

11 14
3Z 4Y

14 13
4Y 4Z

13
4Z

† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.

PRODUCTION DATA information is current as of publication date. Copyright © 1995, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments 2–1
standard warranty. Production processing does not necessarily include
testing of all parameters.

•POST OFFICE BOX 655303 DALLAS, TEXAS 75265

AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER

SLLS114C – JANUARY 1979 – REVISED MAY 1995

schematic (each driver)

Input A

V 22 kΩ

9Ω
Output Y

VCC Common to All Four Drivers

V 22 kΩ To Three
22 kΩ 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 DERATING FACTOR TA = 70°C
POWER RATING ABOVE TA = 25°C POWER RATING
D
N 950 mW 7.6 mW/°C 608 mW
1150 mW 9.2 mW/°C 736 mW

recommended operating conditions MIN NOM MAX UNIT
4.75 5 5.25 V
Supply voltage, VCC
High-level input voltage, VIH 2V
Low-level input voltage, VIL 0.8 V
High-level output current, IOH – 20 mA
Low-level output current, IOL 20 mA
Operating free-air temperature, TA
0 70 °C

electrical characteristics over operating free-air temperature range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP† MAX UNIT
– 1.5 V
VIK Input clamp voltage VCC = 4.75 V, II = – 18 mA 2.5 V
VOH High-level output voltage VCC = 4.75 V, IOH = – 20 mA – 30 0.5 V
VOL Low-level output voltage VCC = 4.75 V, IOL = 20 mA – 20
VO = 0.5 V µA
IOZ Off-state (high-impedance-state) output current VCC = 4.75 V VO = 2.5 V 20
VI = 7 V 0.1 mA
II Input current at maximum input voltage VCC = 5.25 V, VI = 2.7 V 20 µA
IIH High-level input current VCC = 5.25 V, VI = 0.4 V – 0.36 mA
IIL Low-level input current VCC = 5.25 V, – 150 mA
IOS Short-circuit output current‡ VCC = 5.25 V 80 mA

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.

switching characteristics, VCC = 5 V, TA = 25°C

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
14 20 ns
tPLH Propagation delay time, low-to-high-level output CL = 30 pF, S1 and S2 open, 14 20 ns
tPHL Propagation delay time, high-to-low-level output See Figure 1 1 6 ns
Output-to-output skew
25 40 ns
tPZH Output enable time to high level CL = 30 pF, RL = 75 Ω,
See Figure 1 37 45 ns

tPZL Output enable time to low level CL = 30 pF, RL = 180 Ω, 21 30 ns
See Figure 1 23 35 ns

tPHZ Output disable time from high level CL = 10 pF, S1 and S2 closed,
tPLZ Output disable time from low level See Figure 1

•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 VCC Input A 1.3 V 1.3 V 3V
(see Notes B tPLH
180 Ω Skew 0V
and C) Skew tPLH tPHL
From Output S1
Under Test Output Y 1.5 V VOH
75 Ω 1.5 V
CL S2 tPHL
(see Note A) VOL
Output Z
VOH

VOL

TEST CIRCUIT PROPAGATION DELAY TIMES AND SKEW

Enable G See Note D 1.5 V 3V
(see Note D) 1.5 V 0V

Enable G tPZL tPLZ S1 Closed ≈ 1.5 V
≈ 4.5 V S2 Closed VOL
Waveform 1 S1 Closed 1.5 V
(see Note E) S2 Open 0.5 V
0.5 V
tPZH tPHZ

Waveform 2 S1 Open 1.5 V VOH
(see Note E) S2 Closed ≈0 V ≈ 1.5 V

S1 Closed
S2 Closed

ENABLE AND DISABLE TIME WAVEFORMS

NOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO ≈ 50 Ω, tr ≤ 15 ns, and tf ≤ 6 ns.
C. When measuring propagation delay times and skew, switches S1 and S2 are open.

D. Each enable is tested separately.

E. 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 OUTPUT VOLTAGE

vs vs

ENABLE G INPUT VOLTAGE ENABLE G INPUT VOLTAGE

4 ÎÎÎÎÎVCC = 5.25 V VO – Y Output Voltage – V 4 TA = 70°C
ÎÎÎÎÎVCC = 5 V TA = 0°C
ÎÎÎÎÎÎLoad = 470 Ω to GND ÎÎÎÎÎÎÎÎÎÎÎÎÎÎVCC = 4.75 V ÎÎÎÎÎÎÎÎÎÎÎÎVCC = 5 V
See Note A Load = 470 Ω to GND

ÎÎÎÎÎÎÎÎÎÎÎÎTA = 25°C ÎÎÎÎÎÎÎÎÎÎÎÎSee Note A
ÎÎÎÎÎÎÎÎ ÎÎÎÎ3
3
ÎÎÎÎÎÎÎÎ ÎÎÎÎTA=25°C
VO – Y Output Voltage – V 2 2

11

0 0
0123 0123
VI – Enable G Input Voltage – V VI – Enable G Input Voltage – V

Figure 2 Figure 3

OUTPUT VOLTAGE OUTPUT VOLTAGE
vs
vs
ENABLE G INPUT VOLTAGE
ENABLE G INPUT VOLTAGE
6 ÎÎÎÎÎÎÎLoad = 470 Ω to VCC 6
See Note B
ÎÎÎÎÎVCC = 5.25 V ÎÎÎÎÎÎÎVCC = 5 V
ÎÎÎÎÎÎÎÎÎ5 VCC = 5 V ÎÎÎÎÎÎÎÎÎÎÎÎÎÎTA = 25°C Load = 470 Ω to VCC
ÎÎÎÎÎVCC = 4.75 V
ÎÎÎÎÎ4 ÎÎÎÎÎÎÎSee Note B
ÎÎÎÎÎÎÎ5

VO– Output Voltage – V 3 VO– Output Voltage – V 4 ÎÎÎÎTA = 0°C
TA = 70°C
2
ÎÎÎÎ3
ÎÎÎÎÎÎÎÎTA = 25°C

2

11

0 0 3
0123 012
VI – Enable G Input Voltage – V VI – Enable G Input Voltage – V

Figure 4 Figure 5

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 outputs.

•POST OFFICE BOX 655303 DALLAS, TEXAS 75265 2–5

AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER

SLLS114C – JANUARY 1979 – REVISED MAY 1995

TYPICAL CHARACTERISTICS

VOOHH – High-Level Output Voltage – V HIGH-LEVEL OUTPUT VOLTAGE HIGH-LEVEL OUTPUT VOLTAGEVOOHH – High-Level Output Voltage – V
vs vs

FREE-AIR TEMPERATURE HIGH-LEVEL OUTPUT CURRENT
4
5
ÎÎÎÎÎVCC = 5.25 V
ÎÎÎÎVCC = 5 V ÎÎÎÎÎÎÎÎÎÎÎÎVCC = 5 V
See Note A
3
ÎÎÎÎ4
ÎÎÎÎÎÎÎÎÎÎÎÎÎIOH = –20 mA ÎÎÎÎÎÎÎÎÎÎVCC = 4.75 V
3
2
ÎÎÎÎÎÎÎÎÎÎIOH = –40 mA
1
2
ÁÁÁÁÎÎÎÎÎTA = 25°C
ÁÁÁÁÁÁ 1 10 20 30 40 50 60 70 80 ÁÁÎÎÎÎÎSee Note A
0 TA – Free-Air Temperature – °C
0 0
0 – 20 – 40 – 60 – 80 – 100
Figure 6 IOH – High-Level Output Current – mA

Figure 7

LOW-LEVEL OUTPUT VOLTAGE LOW-LEVEL OUTPUT VOLTAGE
vs
vs
FREE-AIR TEMPERATURE
LOW-LEVEL OUTPUT CURRENT
0.5
ÎÎÎÎÎÎÎÎ0.91
ÎÎÎÎVCC = 5 V
IOL = 40 mA TA = 25°C
See Note B
VOL – Low-Level Output Voltage – V ÎÎÎÎÎSee Note B VOL – Low-Level Output Voltage – V ÎÎÎÎ0.8
ÎÎÎÎ0.4

0.3 0.7 ÎÎÎÎÎVCC = 4.75 V
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎVCC = 5.25 V
0.2 25 50 0.6 120
TA – Free-Air Temperature – °C 20 40 60 80 100
ÁÁÁÁÁÁ0.1 0.5 IOL – Low-Level Output Current – mA
0 Figure 8
0 0.4

0.3

ÁÁÁ0.2
ÁÁÁÁÁÁ0.1

0
75 0

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 •POST OFFICE BOX 655303 DALLAS, TEXAS 75265

AM26LS31C
QUADRUPLE DIFFERENTIAL LINE DRIVER

SLLS114C – JANUARY 1979 – REVISED MAY 1995

TYPICAL CHARACTERISTICS

Y OUTPUT VOLTAGE Y OUTPUT VOLTAGE

vs vs

DATA INPUT VOLTAGE DATA INPUT VOLTAGE

5 VCC = 5.25 V 5 ÎÎÎÎTÎÎÎÎTAA==ÎÎÎÎ700°°CÎÎÎÎC

ÎÎÎÎNo Load ÎÎÎÎÎVCC = 5 V ÎÎÎÎÎÎÎÎNo Load
ÎÎÎÎTA = 25°C ÎÎÎÎÎÎÎÎÎÎVCC = 4.75 V
4
4 3
3
VO – Y Output Voltage – V ÎÎÎÎÎÎÎÎTA = 25°C
2 VO – Y Output Voltage – V 2

11

0 0
0123 0123
VI – Data Input Voltage – V VI – Data Input Voltage – V

Figure 10 Figure 11

•POST OFFICE BOX 655303 DALLAS, TEXAS 75265 2–7

2–8 •POST OFFICE BOX 655303 DALLAS, TEXAS 75265

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Copyright © 1995, Texas Instruments Incorporated