SN55ALS194, SN75ALS194

QUADRUPLE DIFFERENTIAL LINE DRIVERS

SLLS009D – OCTOBER 1985 – REVISED MAY 1995

D Meet or Exceed the Requirements of ANSI SN55ALS194 . . . J OR W PACKAGE

Standard EIA/TIA-422-B and ITU SN75ALS194 . . . D OR N PACKAGE
(TOP VIEW)
Recommendation V.11
D Designed to Operate Up to 20 Mbaud 1A 1 16 VCC
D 3-State TTL - Compatible Outputs 1Y 2 15 4A
D Single 5-V Supply Operation 1Z 3 14 4Y
D High Output Impedance in Power-Off 1, 2EN 4 13 4Z
Condition 2Z 5 12 3, 4EN
D Two Pairs of Drivers, Independently 2Y 6 11 3Z
Enabled 2A 7 10 3Y

D GND 8 9 3A
Designed as Improved Replacements for
the MC3487

description SN55ALS194 . . . FK PACKAGE

(TOP VIEW)
These four differential line drivers are designed

V CC
for data transmission over twisted-pair or

NC
1Y
1A

4A
parallel-wire transmission lines. They meet the
requirements of ANSI Standard EIA/TIA-422-B
3 2 1 20 19
and ITU Recommendation V.11 and are 1Z 4 18 4Y
compatible with 3-state TTL circuits. Advanced 1, 2EN 5 17 4Z
low-power Schottky technology provides high NC 6 16 NC
speed without the usual power penalty. Standby 2Z 7 15 3, 4EN
supply current is typically only 26 mA. Typical 2Y 8 14 3Z
propagation delay time is less than 10 ns, and 9 10 11 12 13
enable/disable times are typically less than

2A

3A
3Y
NC
GND
16 ns.
High-impedance inputs keep input currents low:
less than 1 µA for a high level and less than NC – No internal connection

100 µA for a low level. The driver circuits can be

enabled in pairs by separate active-high enable
inputs. The SN55ALS194 and SN75ALS194 are
capable of data rates in excess of 20 megabits
per second and are designed to operate with the
SN55ALS195 and SN75ALS195 quadruple line
receivers.
The SN55ALS194 is characterized for operation over the full military temperature range of – 55°C to 125°C. The
SN75ALS194 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each driver)
INPUTS OUTPUT OUTPUTS
A EN Y Z
H H H L
L H L H
X L Z Z
H = high level, L = low level, X = irrelevant,
Z = high impedance

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Copyright  1995, Texas Instruments Incorporated
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 1

SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

logic symbol† logic diagram (positive logic)

4 4
1, 2EN EN 1, 2EN

2
1 1Y 2
1A 1Y
3 1
1Z 1A
3
1Z
6
7 2Y
2A 5 6
2Z 2Y
7
2A
5
2Z
12
3, 4EN EN

12
10 3, 4EN
9 3Y
3A 11
3Z 10
3Y
9
14 3A
15 4Y 11
3Z
4A 13
4Z
14
4Y
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and 15
4A
IEC Publication 617-12. 13
4Z
Pin numbers shown are for the D, J, N, and W packages.

schematics of inputs and outputs

EQUIVALENT OF EACH EQUIVALENT OF EACH EQUIVALENT OF EACH
DATA (A) INPUT ENABLE INPUT OUTPUT
VCC VCC VCC

Input Input

Output

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 SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

absolute maximum ratings over operating free-air temperature range (unless otherwise noted) †
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Output voltage, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA: SN55ALS194 . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN75ALS194 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Case temperature for 60 seconds, TC: FK package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D, N, or W package . . . . . . . . . . . . . 260°C
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . . . . . . . . . . . . . . . . . . . . 300°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 are with respect to network ground terminal

DISSIPATION RATING TABLE

TA ≤ 25°C DERATING FACTOR TA = 70°C TA = 125°C
PACKAGE
POWER RATING ABOVE TA = 25°C POWER RATING POWER RATING
D 950 mW 7.6 mW/°C 608 mW N/A
FK 1375 mW 11.0 mW/°C 880 mW 275 mW
J 1375 mW 11.0 mW/°C 880 mW 275 mW
N 1150 mW 9.2 mW/°C 736 mW N/A
W 1000 mW 8.0 mW/°C 640 mW 200 mW

recommended operating conditions‡

SN55ALS194 SN75ALS194
UNIT
MIN NOM MAX MIN NOM MAX
Supply voltage, VCC 4.5 5 5.5 4.75 5 5.25 V
All inputs, TA = 25°C 2 2
High-level input voltage, VIH A inputs, TA = Full range 2 2 V
EN inputs, TA = Full range 2.1 2
Low-level input voltage, VIL 0.8 0.8 V
High-level output current, IOH – 20 – 20 mA
TA = 25°C 48 48
Low level output current,
Low-level current IOL mA
TA = Full range 20 48
Operating free-air temperature, TA – 55 125 0 70 °C
‡ Full range is TA = – 55°C to 125°C for SN55ALS194 and TA = 0°C to 70°C for SN75ALS194.

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SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS† MIN TYP‡ MAX UNIT
VIK Input clamp voltage VCC = MIN, II = – 18 mA – 1.5 V
VCC = MIN,, SN55ALS194 2.4
VOH High level output voltage
High-level V
IOH = –20 mA SN75ALS194 2.5
VOL Low-level output voltage VCC = MIN, IOL = MAX 0.5 V
VO Output voltage IO = 0 0 6 V
|VOD1| Differential output voltage IO = 0 1.5 6 V
1/2 VOD1
|VOD2| Differential output voltage V
or 2§
Change in magnitude of
∆|VOD| ± 0.4 V
differential output voltage¶ RL = 100 Ω, See Figure 1
VOC Common-mode output voltage ±3 V
Change in magnitude of
∆|VOC| ± 0.4 V
common-mode output voltage¶
VO = 6 V 100
IO Output current with power off VCC = 0 µA
VO = – 0.25 V – 100
VO = 2.7 V 100
VCC = MAX
MAX,
IOZ High-impedance-state output current µA
Output enables at 0.8 V VO = 0.5 V – 100

II Input current at maximum input voltage VCC = MAX, VI = 5.5 V 100 µA

IIH High-level input current VCC = MAX, VI = 2.7 V 50 µA
IIL Low-level input current VCC = MAX, VI = 0.5 V – 200 µA
IOS Short-circuit output current# VCC = MAX, VI = 2 V – 40 – 140 mA
ICC Supply current (all drivers) VCC = MAX, All outputs disabled 26 45 mA
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2 V, whichever is greater.
¶ ∆ | VOD | and ∆ | VOC | are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to
a low level.
# 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

TEST SN55ALS194 SN75ALS194
PARAMETER UNIT
CONDITIONS MIN TYP MAX MIN TYP MAX
tPLH Propagation delay time, low- to high-level output 6 13 6 13 ns
CL = 15 pF,
F
tPHL Propagation delay time, high- to low-level output 9 14 9 14 ns
See Figure 2
Output-to-output skew 3.5 6 3.5 6 ns
CL = 15 pF,
tt(OD) Differential output transition time 8 14 8 14 ns
See Figure 3
tPZH Output enable time to high level 9 12 9 12 ns
tPZL Output enable time to low level CL = 15 pF, 12 20 12 20 ns
tPHZ Output disable time from high level See Figure 4 9 15 9 14 ns
tPLZ Output disable time from low level 12 15 12 15 ns

4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

 SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

SYMBOL EQUIVALENTS
RL
DATA SHEET PARAMETER EIA/TIA-422-B
2
VO Voa, Vob VOD2
| VOD1 | Vo RL
VOC
| VOD2 | Vt (RL = 100 Ω) 2
∆ | VOD | | |Vt| – |Vt| |
VOC | Vos | Figure 1. Driver VOD and VOC
∆ | VOC | | Vos – Vos |
IOS |Isa|, |Isb|
IO |Ixa| , |Ixb|

PARAMETER MEASUREMENT INFORMATION

3V
Input 1.5 V 1.5 V

0V
5V tPHL
tPLH VOH
S1 200 Ω
Y Output 1.5 V 1.5 V
Generator
(see Note A) 50 Ω VOL
CL = 15 pF Skew Skew
(see Note B)
tPHL tPLH
3V
VOH
See Note C
Z Output 1.5 V 1.5 V
VOL

TEST CIRCUIT VOLTAGE WAVEFORM

NOTES: A. The input pulse is supplied by a generator having the following characteristics: tr ≤ 5 ns, tf ≤ 5 ns, PRR ≤ 1 MHz, duty cycle ≤ 50%,
ZO ≈ 50 Ω .
B. CL includes probe and stray capacitance.
C. All diodes are 1N916 or 1N3064.

Figure 2. Test Circuit and Voltage Waveform

3V
Input
CL RL = 100 Ω 0V
Generator 50 Ω Output tt(OD) tt(OD)
(see Note A)
90%
Output
CL CL = 15 pF 10%
3V (see Note B)

TEST CIRCUIT VOLTAGE WAVEFORM

NOTES: A. The input pulse is supplied by a generator having the following characteristics: tr ≤ 5 ns, tf ≤ 5 ns, PRR ≤ 1 MHz, duty cycle ≤ 50%,
ZO ≈ 50 Ω .
B. CL includes probe and stray capacitance.

Figure 3. Differential-Output Test Circuit and Voltage Waveform

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5

SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

PARAMETER MEASUREMENT INFORMATION

Output 5V

S3 S1 200 Ω

0 V or 3 V
1 kΩ See Note C
CL = 15 pF
Generator (see Note B)
(see Note A) 50 Ω

S2

TEST CIRCUIT

Output 3V Output 3V
Enable Enable
Input 1.5 V Input 1.5 V
0V 0V
tPHZ tPZL
Output VOH Output
S1 Closed S1 Closed 1.5 V
0.5 V
S2 Closed S2 Open
≈ 1.5 V VOL
tPLZ tPZH
≈ 1.5 V Output VOH
Output
0.5 V S1 Open 1.5 V
S1 Closed 1.5 V
S2 Closed S2 Closed
VOL

VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: tr ≤ 5 ns, tf ≤ 5 ns, PRR ≤ 1 MHz, duty cycle ≤ 50%,
ZO ≈ 50 Ω .
B. CL includes probe and stray capacitance.
C. All diodes are 1N916 or 1N3064.

Figure 4. Driver Test Circuit and Voltage Waveforms

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 SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

TYPICAL CHARACTERISTICS†

Y OUTPUT VOLTAGE Y OUTPUT VOLTAGE

vs vs
DATA INPUT VOLTAGE DATA INPUT VOLTAGE

5 5
No Load VCC = 5 V
4.5 Outputs Enabled 4.5 Outputs Enabled
TA = 25°C No Load
4 VCC = 5.5 V 4

VO – Y Output Voltage – V
VO – Y Output Voltage – V

TA = 125°C
3.5 VCC = 5 V 3.5

3 VCC = 4.5 V 3
TA = 25°C
2.5 2.5
TA = 70°C TA = 0°C
2 2
TA = – 55°C
1.5 1.5

1 1

0.5 0.5

0 0
0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3

VI – Data Input Voltage – V VI – Data Input Voltage – V

Figure 5 Figure 6

Y OUTPUT VOLTAGE Y OUTPUT VOLTAGE

vs vs
ENABLE G INPUT VOLTAGE ENABLE G INPUT VOLTAGE
4 5
VCC = 5.5 V VCC = 5 V
4.5 VI = 2 V
3.5
RL = 470 Ω to GND
VCC = 5 V 4 See Note A
VO – Y Output Voltage – V

VO – Y Output Voltage – V

3 TA = 125°C
VCC = 4.5 V 3.5
2.5
3
TA = 25°C
2 2.5
TA = 70°C TA = 0°C
1.5 2
TA = – 55°C
1.5
1
VI = 2 V 1
0.5 RL = 470 Ω to GND
See Note A 0.5
TA = 25°C
0 0
0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3
VI – Enable G Input Voltage – V VI – Enable G Input Voltage – V

Figure 7 Figure 8
† Data for temperatures below 0°C and above 70°C are applicable to the SN55ALS194 circuits only.
NOTE A: The A input is connected to VCC during the testing of the Y outputs and to GND during the testing of the Z outputs.

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SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

TYPICAL CHARACTERISTICS†

Z OUTPUT VOLTAGE Z OUTPUT VOLTAGE

vs vs
ENABLE G INPUT VOLTAGE ENABLE G INPUT VOLTAGE
6 6
VCC = 5.5 V RL = 470 Ω to VCC VCC = 5 V
TA = 25°C RL = 470 Ω to VCC
VCC = 5 V See Note A
5 See Note B
5
VCC = 4.5 V
VO – Z Output Voltage – V

VO – Z Output Voltage – V
4 4
TA = 125°C
TA = 70°C
3 3 TA = 25°C
TA = 0°C
2 2 TA = – 55°C

1 1

0 0
0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3
VI – Enable G Input Voltage – V VI – Enable G Input Voltage – V
Figure 9 Figure 10

HIGH-LEVEL OUTPUT VOLTAGE HIGH-LEVEL OUTPUT VOLTAGE

vs vs
FREE-AIR TEMPERATURE HIGH-LEVEL OUTPUT CURRENT
5
VCC = 5 V 5
TA = 25°C
4.5 IOH = – 20 mA 4.5 See Note A
VOH – High-Level Output Voltage – V

VOH – High-Level Output Voltage – V

See Note A
4 4
3.5 3.5
VCC = 5.5 V
3 3
VCC = 5 V
2.5 2.5
VCC = 4.5 V
2 2
1.5 1.5

1 1

0.5 0.5

0 0
– 75 – 50 – 25 0 25 50 75 100 125 0 – 10 – 20 – 30 – 40 – 50 – 60 – 70 – 80 – 90 – 100
TA – Free-Air Temperature – °C IOH – High-Level Output Current – mA
Figure 11 Figure 12
† Data for temperatures below 0°C and above 70°C are applicable to the SN55ALS194 circuits only.
NOTES: A. The A input is connected to VCC during the testing of the Y outputs and to GND during the 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.

8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

 SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

TYPICAL CHARACTERISTICS†

LOW-LEVEL OUTPUT VOLTAGE LOW-LEVEL OUTPUT VOLTAGE

vs vs
FREE-AIR TEMPERATURE LOW-LEVEL OUTPUT CURRENT
0.5 1
VCC = 5 V TA = 25°C
0.45 IOL= – 20 mA 0.9 See Note A

VOL – Low-Level Output Voltage – V

VOL – Low-Level Output Voltage – V

See Note A VCC = 4.5 V

0.4 0.8

0.35 0.7
VCC = 5 V
0.3 0.6

0.25 0.5

0.2 0.4
VCC = 5.5 V
0.15 0.3

0.1 0.2

0.05 0.1

0 0
– 75 – 50 – 25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 90 100

TA – Free-Air Temperature – °C IOL – Low-Level Output Current – mA

Figure 13 Figure 14
NOTE A: The A input is connected to GND during the testing of the Y outputs and to VCC during the testing of the Z outputs.

SUPPLY CURRENT SUPPLY CURRENT

vs vs
SUPPLY VOLTAGE SUPPLY VOLTAGE
80 40
Outputs Enabled A Inputs Open or Grounded
No Load Outputs Disabled
70 35
TA = 25°C No Load
TA = 25°C
60 30
I CC – Supply Current – mA

I CC – Supply Current – mA

50 25
Inputs Grounded
40 20
Inputs Open
30 15

20 10

10 5

0 0
0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8
VCC – Supply Voltage – V VCC – Supply Voltage – V

Figure 15 Figure 16
† Data for temperatures below 0°C and above 70°C are applicable to the SN55ALS194 circuits only.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9

SN55ALS194, SN75ALS194
QUADRUPLE DIFFERENTIAL LINE DRIVERS
SLLS009D – OCTOBER 1985 – REVISED MAY 1995

TYPICAL CHARACTERISTICS
SUPPLY CURRENT
vs
FREQUENCY
60
VCC = 5 V
Input = 0 to 3 V
50 Duty Cycle = 50%
CL = 30 pF to All Outputs
I CC – Supply Current – mA

40

30

20

10

0
10 k 100 k 1M 10 M 100 M
f – Frequency – Hz

Figure 17

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