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MC74LCX652DT

Low–Voltage CMOS Octal Transceiver/Registered Transceiver With Dual Enable

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Low-Voltage CMOS Octal

Transceiver/Registered

Transceiver With Dual Enable

With 5V-Tolerant Inputs and Outputs

(3-State, Non-Inverting)

The MC74LCX652 is a high performance, non–inverting octal

transceiver/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

MC74LCX652 inputs to be safely driven from 5V devices. The

MC74LCX652 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. Two Output

Enable pins (OEBA, OEAB) 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 (SBA, SAB) 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).

• 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 CBA SBA OEBA B0 B1 B2 B3 B4 B5 B6 B7

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

MC74LCX652

LOW–VOLTAGE CMOS

OCTAL TRANSCEIVER/

REGISTERED TRANSCEIVER

WITH DUAL ENABLE

DW SUFFIX

24–LEAD PLASTIC SOIC PACKAGE

CASE 751E–04

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

SAB, SBA

OEBA, OEAB

Function

Side A Inputs/Outputs

Side B Inputs/Outputs

Clock Pulse Inputs

Select Control Inputs

Output Enable Inputs

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

CAB SAB OEAB A0 A1 A2 A3 A4 A5 A6 A7 GND

Figure 1. 24–Lead Pinout (Top View)

3/97

© Motorola, Inc. 1997

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