Texas Instruments SN54ALS243AJ, SN74ALS243A-1N, SN74ALS243AD, SN74ALS243ADR, SN74ALS243AN Datasheet
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SN54ALS243A, SN74ALS243A
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994
Copyright 1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• Two-Way Asynchronous Communication
Between Data Buses
• pnp Inputs Reduce dc Loading
• Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
These quadruple bus transceivers are designed
for asynchronous two-way communication
between data buses. The control-function
implementation allows for maximum flexibility in
timing. These devices allow data transmission
from the A bus to the B bus or from the B bus to the
A bus depending upon the logic levels at the
output-enable (OEBA and OEAB
) inputs. The
output-enable inputs can be used to disable the
device so that the buses are effectively isolated.
The dual-enable configuration gives the
quadruple bus transceivers the capability to store
data by simultaneously enabling OEBA and
OEAB
. Each output reinforces its input in this
transceiver configuration. When both control
inputs are enabled and all other data sources to
the two sets of bus lines are at high impedance,
both sets of bus lines (eight in all) retain their
states. The 4-bit codes appearing on the two sets
of buses are identical.
The SN54ALS243A is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74ALS243A is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OEAB
OEBA
FUNCTION
L L A to B
H H B to A
H L Isolation
L H
Latch A and B
(A = B)
SN54ALS243A ...J PACKAGE
SN74ALS243A ...D OR N PACKAGE
(TOP VIEW)
SN54ALS243A . . . FK PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
NC
NC
B1
NC
B2
A1
NC
A2
NC
A3
NC
OEAB
NC
B4
B3
V
OEBA
A4
GND
NC
CC
NC – No internal connection
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OEAB
NC
A1
A2
A3
A4
GND
V
CC
OEBA
NC
B1
B2
B3
B4
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.
SN54ALS243A, SN74ALS243A
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
logic diagram (positive logic)
B4
B3
B2
B1
OEBA
8
9
10
11
13
A4
A3
A2
A1
OEAB
6
5
4
3
1
3
A1
B1
11
EN2
1
EN1
13
OEBA
5
A3
6
A4
4
A2
B2
10
B3
9
B4
8
OEAB
1
2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54ALS243A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS243A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°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.
recommended operating conditions
SN54ALS243A SN74ALS243A
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
I
OH
High-level output current –12 –15 mA
I
OL
Low-level output current 12 24 mA
T
A
Operating free-air temperature –55 125 0 70 °C
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