Datasheet

1
FEATURES
GAB
NC
A1
A2
A3
A4
GND
1
2
3
4
5
6
7
V
CC
GBA
NC
B1
B2
B3
B4
14
13
12
11
10
9
8
DESCRIPTION
TYPICAL OF ALL OUTPUTS
V
CC
17 k
Ω
50 NOMΩ
GND
V
CC
EQUIVALENT OF EACH INPUT
INPUT
OUTPUT
SN54LS243 , SN74LS243
www.ti.com ............................................................................................................................................................. SDLS145A – APRIL 1985 – REVISED JULY 2008
QUADRUPLE BUS TRANSCEIVERS
FUNCTION TABLE
• Two-Way Asynchronous Communication
(EACH TRANSCEIVER)
Between Data Buses
INPUTS
• PNP Inputs Reduce D-C Loading
SNxxLS243
GAB GBA
• Hysteresis (Typically 400 mV) at Inputs
L L A to B
Improves Noise Margin
H H B to A
SN54LS243 . . . J OR W PACKAGE
H L Isolation
SN74LS243 . . . D, N, OR NS PACKAGE
L H Latch A and B
(TOP VIEW)
(A = B)
These four-data-line transceivers are designed for asynchronous two-way communications between data buses.
SN74LS243 can be used to drive terminated lines down to 133 Ω .
SN54LS243 is characterized for operation over the full military temperature range of – 55 ° C to 125 ° C.
SN74LS243 is characterized for operation from 0 ° C to 70 ° C.
SCHEMATICS OF INPUTS AND OUTPUTS
1
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.
Copyright © 1985 – 2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.