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MC74LCX652DT

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

ON Semiconductor 

ON Semiconductort

Low−Voltage CMOS Octal

Transceiver/Registered

Transceiver With Dual

Enable

With 5 V−Tolerant Inputs and Outputs

(3−State, Non−Inverting)

The MC74LCX652 is a high performance, non−inverting octal

transceiver/registered transceiver operating from a 2.3 to 3.6 V 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 5.5 V allows

MC74LCX652 inputs to be safely driven from 5 V 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 2.3 to 3.6 V VCC Operation

• 5 V Tolerant − Interface Capability With 5 V TTL Logic

• Supports Live Insertion and Withdrawal

• IOFF Specification Guarantees High Impedance When VCC = 0 V

• LVTTL Compatible

• LVCMOS Compatible

• 24 mA Balanced Output Sink and Source Capability

• Near Zero Static Supply Current in All Three Logic States (10 μA)

Substantially Reduces System Power Requirements

• Latchup Performance Exceeds 500 mA

• ESD Performance: Human Body Model >2000 V; Machine Model

>200 V

MC74LCX652

LOW−VOLTAGE CMOS

OCTAL TRANSCEIVER/

REGISTERED TRANSCEIVER

WITH DUAL ENABLE

DT SUFFIX

24−LEAD PLASTIC TSSOP PACKAGE

CASE 948H

DW SUFFIX

24−LEAD PLASTIC SOIC PACKAGE

CASE 751E

Figure 1. PIN NAMES

Pins

Function

A0−A7

B0−B7

CAB, CBA

SAB, SBA

OEBA, OEAB

Side A Inputs/Outputs

Side B Inputs/Outputs

Clock Pulse Inputs

Select Control Inputs

Output Enable Inputs

© Semiconductor Components Industries, LLC, 2006

1

June, 2006 − Rev. 4

Publication Order Number:

MC74LCX652/D

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