MC74LCX543 Datasheet, PDF (1/9 Pages) Motorola, Inc – LOW-VOLTAGE CMOS OCTAL LATCHING TRANSCEIVER

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Advance Information
Low-Voltage CMOS Octal
Latching Transceiver
With 5V-Tolerant Inputs and Outputs
(3-State, Non-Inverting)
The MC74LCX543 is a high performance, non–inverting octal latching
transceiver operating from a 2.7 to 3.6V supply. High impedance TTL
compatible inputs significantly reduce current loading to input drivers
while TTL compatible outputs offer improved switching noise
performance. A VI specification of 5.5V allows MC74LCX543 inputs to be
safely driven from 5V devices. The MC74LCX543 is suitable for memory
address driving and all TTL level bus oriented transceiver applications.
For data flow from A to B with the EAB LOW, the A–to–B Output
Enable (OEAB) must be LOW in order to enable data to the B bus, as
indicated in the Function Table. With EAB LOW, a LOW signal on the
A–to–B Latch Enable (LEAB) input makes the A–to–B latches
transparent; a subsequent LOW–to–HIGH transition of the LEAB signal
will latch the A latches, and the outputs no longer change with the A
inputs. With EAB and OEAB both LOW, the 3–State B output buffers are
active and reflect the data present at the output of the A latches. Control
of data flow from B to A is symetric to that above, but uses the EBA,
LEBA, and OEBA inputs.
MC74LCX543
LOW–VOLTAGE CMOS
OCTAL LATCHING
TRANSCEIVER
24
1
DW SUFFIX
PLASTIC SOIC
CASE 751E–04
• Designed for 2.7 to 3.6V VCC Operation
• 5V Tolerant — Interface Capability With 5V TTL Logic
• Supports Live Insertion and Withdrawal
• IOFF Specification Guarantees High Impedance When VCC = 0V
• LVTTL Compatible
• LVCMOS Compatible
• 24mA Balanced Output Sink and Source Capability
• Near Zero Static Supply Current in All Three Logic States (10µA)
Substantially Reduces System Power Requirements
• Latchup Performance Exceeds 500mA
• ESD Performance: Human Body Model >2000V; Machine Model >200V
Pinout: 24–Lead Package (Top View)
VCC EBA B0 B1 B2 B3 B4 B5 B6 B7 LEAB OEAB
24 23 22 21 20 19 18 17 16 15 14 13
24
1
24
1
SD SUFFIX
PLASTIC SSOP
CASE 940D–03
DT SUFFIX
PLASTIC TSSOP
CASE 948H–01
PIN NAMES
Pins
Function
OExx
Exx
LExx
A0–A7
B0–B7
Output Enable Inputs
Enable Inputs
Latch Enable Inputs
3–State Inputs/Outputs
3–State Inputs/Outputs
1 2 3 4 5 6 7 8 9 10 11 12
LEBA OEBA A0 A1 A2 A3 A4 A5 A6 A7 EAB GND
This document contains information on a new product. Specifications and information herein are subject to
change without notice.
11/96
© Motorola, Inc. 1996
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