5-1

FACT DATA

Octal DType Latch

with 3State Outputs

The MC74AC573/74ACT573 is a high-speed octal latch with buffered common

Latch Enable (LE) and buffered common Output Enable (OE) inputs.

The MC74AC573/74ACT573 is functionally identical to the MC74AC373/

74ACT373 but has inputs and outputs on opposite sides.

• Inputs and Outputs on Opposite Sides of Package

Allowing Easy Interface with Microprocessors

• Useful as Input or Output Port for Microprocessors

• Functionally Identical to MC74AC373/74ACT373

• 3-State Outputs for Bus Interfacing

• Outputs Source/Sink 24 mA

• ′ACT573 Has TTL Compatible Inputs

19

20

18

17

16

15

14

2

1

3

4

5

6

7

VCC

13

8

12

9

11

10

O0

O1

O2

O3

O4

O5

O6

O7

LE

OE

D0

D1

D2

D3

D4

D5

D6

D7

GND

PIN NAMES

D0–D7

Data Inputs

LE

Latch Enable Input

OE

3-State Output Enable Input

O0–O7

3-State Latch Outputs

TRUTH TABLE

Inputs

Outputs

OE

LE

Dn

On

L

H

H

H

L

H

L

H

L

L

X

O0

H

X

X

Z

H = HIGH Voltage Level

L = LOW Voltage Level

Z = High Impedance

X = Immaterial

O0 = Previous O0 before LOW-to-HIGH Transition of Clock

MC74AC573

MC74ACT573

OCTAL D-TYPE

LATCH WITH

3-STATE OUTPUTS

N SUFFIX

CASE 738-03

PLASTIC

DW SUFFIX

CASE 751D-04

PLASTIC

LOGIC SYMBOL

D0 D1 D2 D3 D4 D5 D6 D7

LE

O1 O2 O3 O4 O5 O6 O7

OE

O0