SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
D
D
D
D
D
D
D
D
D
D
N PACKAGE
(TOP VIEW)
Meets or Exceeds ANSI Standards
EIA/TIA-422-B and RS-485 and ITU
Recommendation V.11
High-Speed Advanced Low-Power Schottky
Circuitry
Designed for 20-MBaud Operation in Both
Serial and Parallel Applications
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
Low Supply-Current Requirements:
55 mA Max
Wide Positive and Negative Input/Output
Bus-Voltage Ranges
Driver Output Capacity . . . ±60 mA
Thermal Shutdown Protection
Driver Positive and Negative Current
Limiting
Logically Interchangeable With SN75172
1A
1Y
1Z
G
2Z
2Y
2A
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
4A
4Y
4Z
G
3Z
3Y
3A
DW PACKAGE
(TOP VIEW)
1A
1Y
NC
1Z
G
2Z
NC
2Y
2A
GND
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.
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
4A
4Y
NC
4Z
G
3Z
NC
3Y
3A
NC – No internal connection
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.
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.
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
FUNCTION TABLE
(each driver)
INPUT
A
ENABLES
OUTPUTS
G
G
Y
H
H
X
H
Z
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†
G
G
4
≥1
12
EN
2
1A
1
3
6
2A
7
5
10
3A
9
11
14
4A
15
13
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the N package.
logic diagram (positive logic)
4
G
G
12
2
1A
1
7
6
5
2A
9
10
11
3A
4A
3
15
14
13
1Y
1Z
2Y
2Z
3Y
3Z
4Y
4Z
Pin numbers shown are for the N package.
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1Y
1Z
2Y
2Z
3Y
3Z
4Y
4Z
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
TYPICAL OF ALL OUTPUTS
VCC
VCC
35 kΩ NOM
Input
Output
GND
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 voltage range, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –9 V to 14 V
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
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 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
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
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
70
°C
Operating free-air temperature, TA
0
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• DALLAS, TEXAS 75265
3
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
VIK
VO
Input clamp voltage
|VOD1|
Differential output voltage
Output voltage
TEST CONDITIONS
MIN
II = –18 mA
IO = 0
IO = 0
VCC = 5 V,
RL = 100 Ω,
RL = 54 Ω,
See Figure 1
|VOD2|
Differential output voltage
|VOD3|
Differential output voltage
See Note 2
∆|VOD|
Change in magnitude of
differential output voltage§
RL = 54 Ω or 100 Ω,
VOC
Common-mode output voltage¶
∆|VOC|
See Figure 1
TYP†
MAX
UNIT
–1.5
V
0
6
V
1.5
6
V
1/2 VOD1 or 2‡
1.5
2.5
V
5
V
See Figure 1
±0.2
V
RL = 54 Ω or 100 Ω,
See Figure 1
3
–1
V
Change in magnitude of
common-mode output voltage§
RL = 54 Ω or 100 Ω,
See Figure 1
±0.2
V
IO
Output current with power off
VCC = 0,
VO = –7 V to 12 V
±100
µA
IOZ
High-impedance-state
output current
VO = –7 V to 12 V
±100
µA
20
µA
–100
µA
±250
mA
IIH
IIL
High-level input current
Low-level input current
VI = 2.7 V
VI = 0.4 V
IOS
Short-circuit output current
VO = –7 V to 12 V
ICC
Supply current (all drivers)
No load
1.5
5
Outputs enabled
36
55
Outputs disabled
15
30
mA
† All typical values are at VCC = 5 V and 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.
¶ 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, CL = 50 pF
PARAMETER
TEST CONDITIONS
TYP†
MAX
UNIT
td(OD)
tPZH
Differential-output delay time
RL = 54 Ω,
See Figure 2
9
15
22
ns
Output enable time to high level
RL = 110 Ω,
See Figure 3
30
45
70
ns
tPZL
tPHZ
Output enable time to low level
RL = 110 Ω,
See Figure 4
25
40
65
ns
Output disable time from high level
RL = 110 Ω,
See Figure 3
10
20
35
ns
RL = 110 Ω,
See Figure 4
10
30
45
ns
tPLZ
Output disable time from low level
† All typical values are at VCC = 5 V and TA = 25°C.
4
MIN
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
PARAMETER MEASUREMENT INFORMATION
RL
2
VOD2
RL
2
VOC
Figure 1. Differential and Common-Mode Output Voltages
Y
CL
Generator
(see Note A)
50 Ω
3V
3V
RL =
54 Ω
Input
1.5 V
1.5 V
0V
Z
td(ODL)
td(ODH)
CL = 50 pF
(see Note B)
Output Z
Output Y
TEST CIRCUIT
VOLTAGE WAVEFORMS
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
3V
Output
S1
0 V or 3 V
Generator
(see Note A)
Input
CL = 50 pF
(see Note B)
50 Ω
1.5 V
1.5 V
0V
RL = 110 Ω
Output
3V
(see Note C)
tPZH
0.5 V
VOH
2.3 V
Voff ≈ 0
tPHZ
TEST CIRCUIT
VOLTAGE WAVEFORMS
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.
Figure 3. Test Circuit and Voltage Waveforms, tPZH and tPHZ
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
SN75ALS172A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS121D – AUGUST 1990 – REVISED APRIL 1998
PARAMETER MEASUREMENT INFORMATION
5V
RL = 110 Ω
S1
0 V or 3 V
Generator
(see Note A)
Output
3V
Input
1.5 V
1.5 V
0V
tPZL
CL = 50 pF
(see Note B)
50 Ω
2.3 V
Output
tPLZ
5V
VOL
3V
(see Note C)
0.5 V
TEST CIRCUIT
VOLTAGE WAVEFORMS
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.
Figure 4. Test Circuit and Voltage Waveforms, tPZL and tPLZ
6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN75ALS172ADW
ACTIVE
SOIC
DW
20
25
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75ALS172A
SN75ALS172ADWR
ACTIVE
SOIC
DW
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75ALS172A
SN75ALS172AN
ACTIVE
PDIP
N
16
25
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN75ALS172AN
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of