MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

1

REV 0.2

11/96

Advance Information

Low-Voltage CMOS 16-Bit

Transceiver/Registered

Transceiver With Dual Enable

With 5V-Tolerant Inputs and Outputs

(3-State, Non-Inverting)

The MC74LCX16652 is a high performance, non–inverting 16–bit

transceiver/registered transceiver operating from a 2.7 to 3.6V supply.

The device is byte controlled. Each byte has separate control inputs

which can be tied together for full 16–bit operation. 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 MC74LCX16652 inputs to

be safely driven from 5V devices. The MC74LCX16652 is suitable for

memory address driving and all TTL level bus oriented transceiver

applications.

Data on the A or B bus will be clocked into the registers as the

appropriate clock pin goes from a LOW–to–HIGH logic level. Output

Enable pins (OEBAn, OEABn) are provided to control the transceiver

outputs. In the transceiver mode, data present at the high impedance port

may be stored in either the A or the B register or in both. The select

controls (SBAn, SABn) can multiplex stored and real–time (transparent

mode) data. In the isolation mode (both outputs disabled), A data may be

stored in the B register or B data may be stored in the A register. When in

the real–time mode, it is possible to store data without using the internal

registers by simultaneously enabling OEAB and OEBA. In this

configuration, each output reinforces its input (data retention is not

guaranteed in this mode).

Substantially Reduces System Power Requirements

This document contains information on a new product. Specifications and information herein are subject to

change without notice.

PIN NAMES

Function

Side A Inputs/Outputs

Side B Inputs/Outputs

Clock Pulse Inputs

Select Control Inputs

Output Enable Inputs

Pins

A0–A15

B0–B15

CABn, CBAn

SABn, SBAn

OEBAn, OEABn

LOW–VOLTAGE CMOS

16–BIT TRANSCEIVER/

REGISTERED TRANSCEIVER

WITH DUAL ENABLE

MC74LCX16652

DT SUFFIX

PLASTIC TSSOP PACKAGE

CASE 1202–01