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MC74LCX2952DW

Low-Voltage CMOS Octal Registered Transceiver With Dual Output and Clock Enables

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Low-Voltage CMOS Octal

Registered Transceiver With

Dual Output and Clock

Enables

With 5V-Tolerant Inputs and Outputs

(3-State, Non-Inverting)

The MC74LCX2952 is a high performance, non–inverting octal

registered 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 MC74LCX2952 inputs to

be safely driven from 5V devices. The MC74LCX2952 is suitable for

memory address driving and all TTL level bus oriented transceiver

applications.

Two 8–bit back to back registers store data from either of two

bidirectional buses. Data applied to the inputs is entered and stored on

the rising edge of the Clock (CAB, CBA) provided that the Clock Enable

(CEAB, CEBA) is Low. The data is then presented at the 3–state output

buffers, but is only accessible when the Output Enable (OEAB, OEBA) is

Low. The operation of the MC74LCX2952 is symmetrical — A inputs to B

outputs occurs in the same manner as B inputs to A outputs.

MC74LCX2952

LOW–VOLTAGE CMOS

OCTAL REGISTERED

TRANSCEIVER

DW SUFFIX

24–LEAD PLASTIC SOIC WIDE PACKAGE

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

VCC A7 A6 A5 A4 A3 A2 A1 A0 OEBA CBA CEBA

24 23 22 21 20 19 18 17 16 15 14 13

SD SUFFIX

24–LEAD PLASTIC SSOP PACKAGE

CASE 940D–03

DT SUFFIX

24–LEAD PLASTIC TSSOP PACKAGE

CASE 948H–01

PIN NAMES

Pins

A0–A7

B0–B7

CAB, CBA

CEAB, CEBA

OEAB, OEBA

Function

Side A Inputs/Outputs

Side B Inputs/Outputs

Clock Pulse Inputs

Clock Enable Inputs

Output Enable Inputs

1 2 3 4 5 6 7 8 9 10 11 12

B7 B6 B5 B4 B3 B2 B1 B0 OEAB CAB CEAB GND

Figure 1. 24–Lead Pinout (Top View)

3/97

© Motorola, Inc. 1997

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