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BUS TRANSCEIVERS. SN75ALS171 Datasheet

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BUS TRANSCEIVERS. SN75ALS171 Datasheet
















SN75ALS171 TRANSCEIVERS. Datasheet pdf. Equivalent













Part

SN75ALS171

Description

TRIPLE DIFFERENTIAL BUS TRANSCEIVERS



Feature


SN75ALS171, SN75ALS171A TRIPLE DIFFERENT IAL BUS TRANSCEIVERS D Three Bidirecti onal Transceivers D Driver Meets or Exc eeds the Requirements of ANSI EIA/TIA-4 22-B and RS-485 and ITU Recommendation V.11 D Two Skew Limits Available D Desi gned to Operate Up to 20 Million Data T ransfers per Second (FAST-20 SCSI) D Hi gh-Speed Advanced Low-Power Schottky Ci rcuitry D Low Puls.
Manufacture

Texas Instruments

Datasheet
Download SN75ALS171 Datasheet


Texas Instruments SN75ALS171

SN75ALS171; e Skew . . . 5 ns Max D Designed for Mul tipoint Transmission on Long Bus Lines in Noisy Environments D Features Indepe ndent Driver Enables and Combined Recei ver Enables D Wide Positive and Negativ e Input/Output Bus Voltages Ranges D Dr iver Output Capacity . . . ± 60 mA D T hermal Shutdown Protection D Driver Pos itive- and Negative-Current Limiting D Receiver Input Impe.


Texas Instruments SN75ALS171

dances . . . 12 kΩ Min D Receiver Inpu t Sensitivity . . . ± 300 mV Max D Rec eiver Input Hysteresis . . . 60 mV Typ D Operates From a Single 5-V Supply D G litch-Free Power-Up and Power-Down Prot ection SLLS056D – AUGUST 1987 – RE VISED SEPTEMBER 1995 DW OR J PACKAGE (T OP VIEW) 1R 1 1DE 2 1D 3 GND 4 GND 5 2 R 6 2DE 7 2D 8 3R 9 3DE 10 20 1B 19 1A 18 RE 17 CDE 16 VCC 15 2.


Texas Instruments SN75ALS171

B 14 2A 13 3B 12 3A 11 3D description T he SN75ALS171 and the SN75ALS171A tripl e differential bus transceivers are mon olithic integrated circuits designed fo r bidirectional data communication on m ultipoint bus transmission lines. They are designed for balanced transmission lines, and each driver meets ANSI Stand ards EIA/TIA-422-B and RS-485 and both the drivers and re.





Part

SN75ALS171

Description

TRIPLE DIFFERENTIAL BUS TRANSCEIVERS



Feature


SN75ALS171, SN75ALS171A TRIPLE DIFFERENT IAL BUS TRANSCEIVERS D Three Bidirecti onal Transceivers D Driver Meets or Exc eeds the Requirements of ANSI EIA/TIA-4 22-B and RS-485 and ITU Recommendation V.11 D Two Skew Limits Available D Desi gned to Operate Up to 20 Million Data T ransfers per Second (FAST-20 SCSI) D Hi gh-Speed Advanced Low-Power Schottky Ci rcuitry D Low Puls.
Manufacture

Texas Instruments

Datasheet
Download SN75ALS171 Datasheet




 SN75ALS171
SN75ALS171, SN75ALS171A
TRIPLE DIFFERENTIAL BUS TRANSCEIVERS
D Three Bidirectional Transceivers
D Driver Meets or Exceeds the Requirements
of ANSI EIA/TIA-422-B and RS-485 and ITU
Recommendation V.11
D Two Skew Limits Available
D Designed to Operate Up to 20 Million Data
Transfers per Second (FAST-20 SCSI)
D High-Speed Advanced Low-Power Schottky
Circuitry
D Low Pulse Skew . . . 5 ns Max
D Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
D Features Independent Driver Enables and
Combined Receiver Enables
D Wide Positive and Negative Input/Output
Bus Voltages Ranges
D Driver Output Capacity . . . ± 60 mA
D Thermal Shutdown Protection
D Driver Positive- and Negative-Current
Limiting
D Receiver Input Impedances . . . 12 kMin
D Receiver Input Sensitivity . . . ± 300 mV Max
D Receiver Input Hysteresis . . . 60 mV Typ
D Operates From a Single 5-V Supply
D Glitch-Free Power-Up and Power-Down
Protection
SLLS056D – AUGUST 1987 – REVISED SEPTEMBER 1995
DW OR J PACKAGE
(TOP VIEW)
1R 1
1DE 2
1D 3
GND 4
GND 5
2R 6
2DE 7
2D 8
3R 9
3DE 10
20 1B
19 1A
18 RE
17 CDE
16 VCC
15 2B
14 2A
13 3B
12 3A
11 3D
description
The SN75ALS171 and the SN75ALS171A triple differential bus transceivers are monolithic integrated circuits
designed for bidirectional data communication on multipoint bus transmission lines. They are designed for
balanced transmission lines, and each driver meets ANSI Standards EIA/TIA-422-B and RS-485 and both the
drivers and receivers meet ITU Recommendation V.11. The SN75ALS171A is designed for FAST-20 SCSI and
can transmit or receive data pulses as short as 30 ns with a maximum skew of 5 ns.
The SN75ALS171 and the SN75ALS171A operate from a single 5-V power supply. The drivers and receivers
have individual active-high and active-low enables, respectively, which can be externally connected together
to function as a direction control. The driver differential output and the receiver differential input pairs are
connected internally to form differential input/output (I/O) bus ports that are designed to offer minimum loading
to the bus when the driver is disabled or VCC is at 0 V. These ports feature wide positive and negative
common-mode voltage ranges making the device suitable for party-line applications.
The SN75ALS171 and the SN75ALS171A are 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.
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
Copyright © 1995, Texas Instruments Incorporated
1




 SN75ALS171
SN75ALS171, SN75ALS171A
TRIPLE DIFFERENTIAL BUS TRANSCEIVERS
SLLS056D – AUGUST 1987 – REVISED SEPTEMBER 1995
Function Tables
INPUT
D
H
L
X
X
EACH DRIVER
ENABLES
DE
CDE
OUTPUTS
A
B
H
H
H
L
H
H
L
H
L
X
Z
Z
X
L
Z
Z
EACH RECEIVER
DIFFERENTIAL INPUTS
A–B
ENABLE
RE
OUTPUT
R
VID 0.3 V
L
H
– 0.3 V < VID < 0.3 V
L
?
VID – 0.3 V
L
L
X
H
Z
Open
L
H
H = high level, L = low level, ? = indeterminate, X = irrelevant,
Z = high impedance (off)
AVAILABLE OPTIONS
SKEW LIMIT
PART NUMBER
10 ns
SN75ALS171DW SN75ALS171J
5 ns
SN75ALS171ADW
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265




 SN75ALS171
SN75ALS171, SN75ALS171A
TRIPLE DIFFERENTIAL BUS TRANSCEIVERS
logic symbol
SLLS056D – AUGUST 1987 – REVISED SEPTEMBER 1995
logic diagram (positive logic)
17
CDE
2
1DE
7
2DE
10
3DE
18
RE
3
1D
1
1R
8
2D
6
2R
11
3D
9
3R
G5
5EN1
5EN2
5EN3
EN4
1
1
1
4
2
2
1
4
3
3
1
4
19
1A
20
1B
14
2A
15
2B
12
3A
13
3B
CDE 17
2
1DE
1D 3
18
RE
1
1R
7
2DE
8
2D
6
2R
10
3DE
11
3D
9
3R
19 1A
20 1B Bus
14 2A
15 2B Bus
12 3A
13 3B Bus
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
VCC
R(eq)
Input
TYPICAL OF A AND B I/O PORTS
VCC
180 k
NOM
Connected
on A Port
A or B
18 k
NOM
3 k
NOM
TYPICAL OF RECEIVER OUTPUT
85 VCC
NOM
Output
Driver Input: R(eq) = 12 kNOM
Enable Inputs: R(eq) = 8 kNOM
R(eq) = equivalent resistor
180 k
NOM
Connected
on B Port
1.1 k
NOM
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
3




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