Page 1
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds ANSI Standards
EIA/TIA-422-B and RS-485 and ITU
Recommendation V.11
D
High-Speed Advanced Low-Power Schottky
Circuitry
D
Designed for 20-MBaud Operation in Both
Serial and Parallel Applications
D
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
D
Low Supply-Current Requirements:
55 mA Max
D
Wide Positive and Negative Input/Output
Bus-Voltage Ranges
D
Driver Output Capacity...±60 mA
D
Thermal Shutdown Protection
D
Driver Positive and Negative Current
Limiting
D
Logically Interchangeable With SN75172
description
The SN75ALS172A comprises four line drivers
with 3-state differential outputs. They are
designed to meet the requirements of ANSI
Standards EIA/TIA-422-B and RS-485 and ITU
Recommendation V.11. This device is optimized
for balanced multipoint bus transmission at rates
of up to 20 Mbaud. Each driver features wide
positive and negative common-mode output
voltage ranges, making it suitable for party-line
applications in noisy environments.
The SN75ALS172A provides positive- and negative-current limiting and thermal shutdown for protection from
line-fault conditions on the transmission bus line. Shutdown occurs at a junction temperature of
approximately 150°C.
The SN75ALS172A is characterized for operation from 0°C to 70°C.
Copyright 1998, 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.
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.
DW PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1A
1Y
NC
1Z
G
2Z
NC
2Y
2A
GND
V
CC
4A
4Y
NC
4Z
G
3Z
NC
3Y
3A
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1A
1Y
1Z
G
2Z
2Y
2A
GND
V
CC
4A
4Y
4Z
G
3Z
3Y
3A
N PACKAGE
(TOP VIEW)
NC – No internal connection
Page 2
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE
(each driver)
INPUT
ENABLES OUTPUTS
A
G G Y Z
H H X H L
L H XLH
H XLHL
L XLLH
X LHZZ
H = high level, L = low level, X = irrelevant,
Z = high impedance (off)
logic symbol
†
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the N package.
3Y
10
3Z
11
4Y
14
4Z
13
9
3A
15
4A
1Y
2
1Z
3
2Y
6
2Z
5
1
1A
7
2A
4
G
12
≥1
G
EN
logic diagram (positive logic)
1
7
12
9
15
2
3
6
5
10
11
14
13
4
1A
2A
3A
4A
G
G
1Y
1Z
2Y
2Z
3Y
3Z
4Y
4Z
Pin numbers shown are for the N package.
Page 3
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematics of inputs and outputs
Input
V
CC
Output
GND
V
CC
EQUIVALENT OF EACH INPUT TYPICAL OF ALL OUTPUTS
35 kΩ NOM
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
–9 V to 14 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–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 are with respect to network ground terminal.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING
FACTOR
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
DW 1125 mW 9 mW/°C 720 mW 585 mW
N 1150 mW 9.2 mW/°C 736 mW 598 mW
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
2 V
Low-level input voltage, V
IL
0.8 V
Common-mode output voltage, V
OC
12
–7
V
High-level output current, I
OH
–60 mA
Low-level output current, I
OL
60 mA
Operating free-air temperature, T
A
0 70 °
C
Page 4
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IK
Input clamp voltage II = –18 mA –1.5 V
V
O
Output voltage IO = 0 0 6 V
|V
OD1
| Differential output voltage IO = 0 1.5 6 V
p
VCC = 5 V, RL = 100 Ω, See Figure 1 1/2 V
OD1
or 2
‡
|V
OD2
|
Differential output voltage
RL = 54 Ω, See Figure 1 1.5 2.5 5
V
|V
OD3
| Differential output voltage See Note 2 1.5 5 V
∆|VOD|
Change in magnitude of
differential output voltage
§
RL = 54 Ω or 100 Ω, See Figure 1 ±0.2 V
V
OC
Common-mode output voltage
¶
RL = 54 Ω or 100 Ω, See Figure 1
3
–1
V
∆|VOC|
Change in magnitude of
common-mode output voltage
§
RL = 54 Ω or 100 Ω, See Figure 1 ±0.2 V
I
O
Output current with power off VCC = 0, VO = –7 V to 12 V ±100 µA
I
OZ
High-impedance-state
output current
VO = –7 V to 12 V ±100 µA
I
IH
High-level input current VI = 2.7 V 20 µA
I
IL
Low-level input current VI = 0.4 V –100 µA
I
OS
Short-circuit output current VO = –7 V to 12 V ±250 mA
pp
Outputs enabled 36 55
ICCSupply current (all drivers)
No load
Outputs disabled 15 30
mA
†
All typical values are at VCC = 5 V and TA = 25°C.
‡
The minimum V
OD2
with a 100-Ω load is either 1/2 V
OD1
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.
¶
In ANSI Standard EIA/TIA-422-B, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage,
VOS.
NOTE 2: See EIA Standard RS-485, Figure 3-5, Test Termination Measurement 2.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
t
d(OD)
Differential-output delay time RL = 54 Ω, See Figure 2 9 15 22 ns
t
PZH
Output enable time to high level RL = 110 Ω, See Figure 3 30 45 70 ns
t
PZL
Output enable time to low level RL = 110 Ω, See Figure 4 25 40 65 ns
t
PHZ
Output disable time from high level RL = 110 Ω, See Figure 3 10 20 35 ns
t
PLZ
Output disable time from low level RL = 110 Ω, See Figure 4 10 30 45 ns
†
All typical values are at VCC = 5 V and TA = 25°C.
Page 5
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
V
OC
R
L
2
R
L
2
V
OD2
Figure 1. Differential and Common-Mode Output Voltages
VOLTAGE W AVEFORMSTEST CIRCUIT
Output Y
Output Z
Input
0 V
3 V
t
d(ODL)
t
d(ODH)
3 V
Generator
(see Note A)
CL = 50 pF
(see Note B)
C
L
RL =
54 Ω
50 Ω
Y
Z
1.5 V 1.5 V
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, ZO = 50 Ω, duty cycle = 50%, tf ≤ 5 ns,
tr ≤ 5 ns.
B. CL includes probe and stray capacitance.
Figure 2. Differential Output Test Circuit and Voltage Waveforms
t
PZH
0.5 V
RL = 110 Ω
0 V or 3 V
Output
V
OH
Output
VOLTAGE W AVEFORMSTEST CIRCUIT
50 Ω
Input
0 V
3 V
Generator
(see Note A)
t
PHZ
S1
V
off
≈ 0
CL = 50 pF
(see Note B)
1.5 V 1.5 V
2.3 V
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, ZO = 50 Ω, duty cycle = 50%, tf ≤ 5 ns,
tr ≤ 5 ns.
B. CL includes probe and stray capacitance.
C. To test the active-low enable G
, ground G and apply an inverted input waveform to G.
3 V
(see Note C)
Figure 3. Test Circuit and Voltage Waveforms, t
PZH
and t
PHZ
Page 6
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
t
PZL
RL = 110 Ω
0 V or 3 V
Output
V
OL
Output
VOLTAGE W AVEFORMSTEST CIRCUIT
50 Ω
Input
0 V
3 V
Generator
(see Note A)
S1
5 V
CL = 50 pF
(see Note B)
1.5 V 1.5 V
2.3 V
5 V
t
PLZ
0.5 V
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, ZO = 50 Ω, duty cycle = 50%, tf ≤ 5 ns,
tr ≤ 5 ns.
B. CL includes probe and stray capacitance.
C. To test the active-low enable G
, ground G and apply an inverted input waveform to G.
3 V
(see Note C)
Figure 4. Test Circuit and Voltage Waveforms, t
PZL
and t
PLZ
Page 7
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Copyright 1998, Texas Instruments Incorporated
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