MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

1

REV 1

3/97

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.

Substantially Reduces System Power Requirements

Figure 1. 24–Lead Pinout (Top View)

23

24

22

21

20

19

18

2

1

3456

7

VCC

17

8

16

9

15

10

A7

A6

A5

A4

A3

A2

A1

A0 OEBA

B7

B6

B5

B4

B3

B2

B1

B0 OEAB CAB

14

11

13

12

CBA CEBA

CEAB GND

DW SUFFIX

24–LEAD PLASTIC SOIC WIDE PACKAGE

CASE 751E–04

DT SUFFIX

24–LEAD PLASTIC TSSOP PACKAGE

CASE 948H–01

SD SUFFIX

24–LEAD PLASTIC SSOP PACKAGE

CASE 940D–03

MC74LCX2952

LOW–VOLTAGE CMOS

OCTAL REGISTERED

TRANSCEIVER

PIN NAMES

Function

Side A Inputs/Outputs

Side B Inputs/Outputs

Clock Pulse Inputs

Clock Enable Inputs

Output Enable Inputs

Pins

A0–A7

B0–B7

CAB, CBA

CEAB, CEBA

OEAB, OEBA