SN54LS243

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 NC A1 A2 A3 A4 GND 1 2 3 4 5 6 7 14 VCC 13 GBA 12 NC 11 B1 10 B2 9 B3 8 B4 FUNCTION TABLE (EACH TRANSCEIVER) INPUTS GAB GBA LL HH HL LH 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 VCC 17 kΩ INPUT EQUIVALENT OF EACH INPUT 50 Ω NOM VCC 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. PRODUCTION DATA information is current as of publication date. Products conform to spec...