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
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
X
L
H
H
X
L
H
L
L
X
L
L
H
X
L
H
Z
Z
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.
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
VCC
Output
GND
VCC
EQUIVALENT OF EACH INPUT
TYPICAL OF ALL OUTPUTS
35 k
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, VCC
4.75
5
5.25
V
High-level input voltage, VIH
2
V
Low-level input voltage, VIL
0.8
V
Common-mode output voltage, VOC
12
7
V
High-level output current, IOH
60
mA
Low-level output current, IOL
60
mA
Operating free-air temperature, TA
0
70
°
C
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
VIK
Input clamp voltage
II = 18 mA
1.5
V
VO
Output voltage
IO = 0
0
6
V
|VOD1|
Differential output voltage
IO = 0
1.5
6
V
|VOD2|
Differential output voltage
VCC = 5 V,
RL = 100
,
See Figure 1
1/2 VOD1 or 2
V
|VOD2|
Differential output voltage
RL = 54
,
See Figure 1
1.5
2.5
5
V
|VOD3|
Differential output voltage
See Note 2
1.5
5
V
|VOD|
Change in magnitude of
differential output voltage§
RL = 54
or 100
,
See Figure 1
±
0.2
V
VOC
Common-mode output voltage¶
RL = 54
or 100
,
See Figure 1
3
1
V
|VOC|
Change in magnitude of
common-mode output voltage§
RL = 54
or 100
,
See Figure 1
±
0.2
V
IO
Output current with power off
VCC = 0,
VO = 7 V to 12 V
±
100
µ
A
IOZ
High-impedance-state
output current
VO = 7 V to 12 V
±
100
µ
A
IIH
High-level input current
VI = 2.7 V
20
µ
A
IIL
Low-level input current
VI = 0.4 V
100
µ
A
IOS
Short-circuit output current
VO = 7 V to 12 V
±
250
mA
ICC
Supply current (all drivers)
No load
Outputs enabled
36
55
mA
ICC
Supply current (all drivers)
No load
Outputs disabled
15
30
mA
All typical values are at VCC = 5 V and TA = 25
°
C.
The minimum VOD2 with a 100-
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.
¶ 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
td(OD)
Differential-output delay time
RL = 54
,
See Figure 2
9
15
22
ns
tPZH
Output enable time to high level
RL = 110
,
See Figure 3
30
45
70
ns
tPZL
Output enable time to low level
RL = 110
,
See Figure 4
25
40
65
ns
tPHZ
Output disable time from high level
RL = 110
,
See Figure 3
10
20
35
ns
tPLZ
Output disable time from low level
RL = 110
,
See Figure 4
10
30
45
ns
All typical values are at VCC = 5 V and TA = 25
°
C.
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D AUGUST 1990 REVISED APRIL 1998
5
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOC
R
L
2
R
L
2
VOD2
Figure 1. Differential and Common-Mode Output Voltages
VOLTAGE WAVEFORMS
TEST CIRCUIT
Output Y
Output Z
Input
0 V
3 V
td(ODL)
td(ODH)
3 V
Generator
(see Note A)
CL = 50 pF
(see Note B)
CL
RL =
54
50
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
, 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
tPZH
0.5 V
RL = 110
0 V or 3 V
Output
VOH
Output
VOLTAGE WAVEFORMS
TEST CIRCUIT
50
Input
0 V
3 V
Generator
(see Note A)
tPHZ
S1
Voff
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
, 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
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D AUGUST 1990 REVISED APRIL 1998
6
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
tPZL
RL = 110
0 V or 3 V
Output
VOL
Output
VOLTAGE WAVEFORMS
TEST CIRCUIT
50
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
tPLZ
0.5 V
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, ZO = 50
, 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
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TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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Copyright
©
1998, Texas Instruments Incorporated
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