SN54ALS243A_15 Datasheet, PDF (1/11 Pages) Texas Instruments – QUADRUPLE BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

SN54ALS243A, SN74ALS243A
QUADRUPLE BUS TRANSCEIVERS
WITH 3ĆSTATE OUTPUTS
SDAS069B − DECEMBER 1982 − REVISED DECEMBER 1994
• 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.
SN54ALS243A . . . J PACKAGE
SN74ALS243A . . . D OR N PACKAGE
(TOP VIEW)
OEAB 1
NC 2
A1 3
A2 4
A3 5
A4 6
GND 7
14 V_CC
13 OEBA
12 NC
11 B1
10 B2
9 B3
8 B4
SN54ALS243A . . . FK PACKAGE
(TOP VIEW)
A1
3 2 1 20 19
4
18
NC
NC ₅
17 ^NC
A2 6
16 B1
NC 7
15 NC
A3 8
14 B2
9 10 11 12 13
NC − No internal connection
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
Latch A and B
L
H
(A = B)
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.
Copyright  1994, Texas Instruments Incorporated
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