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 14 VCC NC 2 13 GBA A1 3 12 NC A2 4 11 B1 A3 5 10 B2 A4 6 9 B3 GND 7 8 B4 FUNCTION TABLE
(EACH TRANSCEIVER)
INPUTS SNxxLS243 GAB GBA L L H H B to A H L Isolation L H Latch A and B
(A = B) A to 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 0В°C to 70В°C.
SCHEMATICS OF INPUTS AND OUTPUTS
TYPICAL OF ALL OUTPUTS EQUIVALENT OF EACH INPUT
VCC VCC 50 О© NOM
17 kО© INPUT
OUTPUT GND 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. …
