MC74LCX646 查看數據表（PDF） - ON Semiconductor

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MC74LCX646

Low−Voltage CMOS Octal Transceiver/Registered Transceiver

ON Semiconductor 

ON Semiconductort

Low−Voltage CMOS Octal

Transceiver/Registered

Transceiver

With 5 V−Tolerant Inputs and Outputs

(3−State, Non−Inverting)

The MC74LCX646 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

MC74LCX646 inputs to be safely driven from 5 V devices. The

MC74LCX646 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 (OE) and DIR pins 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. The direction control (DIR) determines

which bus will receive data when the enable OE is active LOW. In the

isolation mode (OE HIGH), A data may be stored in the B register or B

data may be stored in the A register. Only one of the two buses, A or B,

may be driven at one time.

• 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

MC74LCX646

LOW−VOLTAGE CMOS

OCTAL TRANSCEIVER/

REGISTERED TRANSCEIVER

DT SUFFIX

24−LEAD PLASTIC TSSOP PACKAGE

CASE 948H

DW SUFFIX

24−LEAD PLASTIC SOIC PACKAGE

CASE 751E

PIN NAMES

Pins

Function

A0−A7

B0−B7

CAB, CBA

SAB, SBA

DIR, OE

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. 5

Publication Order Number:

MC74LCX646/D

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