MC74VHC244 查看數據表（PDF） - Motorola => Freescale

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MC74VHC244

Octal Bus Buffer

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Octal Bus Buffer

The MC74VHC244 is an advanced high speed CMOS octal bus buffer

fabricated with silicon gate CMOS technology. It achieves high speed

operation similar to equivalent Bipolar Schottky TTL while maintaining

CMOS low power dissipation.

The MC74VHC244 is a noninverting 3–state buffer, and has two

active–low output enables. This device is designed to be used with 3–state

memory address drivers, etc.

The internal circuit is composed of three stages, including a buffer output

which provides high noise immunity and stable output. The inputs tolerate

voltages up to 7V, allowing the interface of 5V systems to 3V systems.

• High Speed: tPD = 3.9ns (Typ) at VCC = 5V

• Low Power Dissipation: ICC = 4µA (Max) at TA = 25°C

• High Noise Immunity: VNIH = VNIL = 28% VCC

• Power Down Protection Provided on Inputs

• Balanced Propagation Delays

• Designed for 2V to 5.5V Operating Range

• Low Noise: VOLP = 0.9V (Max)

• Pin and Function Compatible with Other Standard Logic Families

• Latchup Performance Exceeds 300mA

• ESD Performance: HBM > 2000V; Machine Model > 200V

• Chip Complexity: 136 FETs or 34 Equivalent Gates

A1 2

A2 4

A3 6

DATA

INPUTS

A4 8

B1 11

B2 13

B3 15

B4 17

LOGIC DIAGRAM

18 YA1

16 YA2

14 YA3

12 YA4

NONINVERTING

9 YB1 OUTPUTS

7 YB2

5 YB3

3 YB4

OUTPUT OEA 1

ENABLES OEB 19

MC74VHC244

DW SUFFIX

20–LEAD SOIC PACKAGE

CASE 751D–04

DT SUFFIX

20–LEAD TSSOP PACKAGE

CASE 948E–02

M SUFFIX

20–LEAD SOIC EIAJ PACKAGE

CASE 967–01

ORDERING INFORMATION

MC74VHCXXXDW SOIC

MC74VHCXXXDT TSSOP

MC74VHCXXXM

SOIC EIAJ

PIN ASSIGNMENT

OEA 1

A1 2

YB4 3

A2 4

YB3 5

A3 6

YB2 7

A4 8

YB1 9

GND 10

20 VCC

19 OEB

18 YA1

17 B4

16 YA2

15 B3

14 YA3

13 B2

12 YA4

11 B1

FUNCTION TABLE

INPUTS

OEA, OEB

A, B

L

L

L

H

H

X

6/97

© Motorola, Inc. 1997

OUTPUTS

YA, YB

L

H

Z

1

REV 1

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