MC74LCX646DW 查看數據表（PDF） - Motorola => Freescale

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MC74LCX646DW

Low−Voltage CMOS Octal Transceiver/Registered Transceiver

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Low-Voltage CMOS Octal

Transceiver/Registered

Transceiver

With 5V-Tolerant Inputs and Outputs

(3-State, Non-Inverting)

The MC74LCX646 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

MC74LCX646 inputs to be safely driven from 5V 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 2.7 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 OE B0 B1 B2 B3 B4 B5 B6 B7

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

Pinout: 24–Lead Package (Top View)

MC74LCX646

LOW–VOLTAGE CMOS

OCTAL TRANSCEIVER/

REGISTERED TRANSCEIVER

24

1

24

1

24

1

DW SUFFIX

PLASTIC SOIC

CASE 751E–04

SD SUFFIX

PLASTIC SSOP

CASE 940D–03

DT SUFFIX

PLASTIC TSSOP

CASE 948H–01

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

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

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

11/96

© Motorola, Inc. 1996

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REV 2

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