SN54LS243 Datasheet, PDF (1/14 Pages) Texas Instruments – QUADRUPLE BUS TRANSCEIVERS

SN54LS243, SN74LS243
www.ti.com ............................................................................................................................................................. SDLS145A – APRIL 1985 – REVISED JULY 2008
QUADRUPLE BUS TRANSCEIVERS
FEATURES
1
• Two-Way Asynchronous Communication
Between Data Buses
• PNP Inputs Reduce D-C Loading
• Hysteresis (Typically 400 mV) at Inputs
Improves Noise Margin
SN54LS243 . . . J OR W PACKAGE
SN74LS243 . . . D, N, OR NS PACKAGE
(TOP VIEW)
GAB 1
NC 2
A1 3
A2 4
A3 5
A4 6
GND 7
14 ^V_CC
13 GBA
12 NC
11 B1
10 B2
9 B3
8 B4
FUNCTION TABLE
(EACH TRANSCEIVER)
INPUTS
GAB
GBA
L
L
H
H
H
L
L
H
SNxxLS243
A to B
B to A
Isolation
Latch A and B
(A = B)
DESCRIPTION
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
TYPICAL OF ALL OUTPUTS
V_CC
17 kΩ
INPUT
EQUIVALENT OF EACH INPUT
V_CC
50 Ω NOM
OUTPUT
GND
1
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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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1985–2008, Texas Instruments Incorporated