MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

1

REV 0

6/97

Octal D-Type Latch

with 3-State Output

The MC74VHCT373A is an advanced high speed CMOS octal latch with

3–state output fabricated with silicon gate CMOS technology. It achieves

high speed operation similar to equivalent Bipolar Schottky TTL while

maintaining CMOS low power dissipation.

This 8–bit D–type latch is controlled by a latch enable input and an output

enable input. When the output enable input is high, the eight outputs are in a

high impedance state.

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

which provides high noise immunity and stable output.

The VHCT inputs are compatible with TTL levels. This device can be used

as a level converter for interfacing 3.3V to 5.0V, because it has full 5V CMOS

level output swings.

The VHCT373A input and output (when disabled) structures provide

protection when voltages between 0V and 5.5V are applied, regardless of

the supply voltage. These input and output structures help prevent device

destruction caused by supply voltage – input/output voltage mismatch,

battery backup, hot insertion, etc.

• High Speed: tPD = 7.7ns (Typ) at VCC = 5V

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

• TTL–Compatible Inputs: VIL = 0.8V; VIH = 2.0V

• Power Down Protection Provided on Inputs and Outputs

• Balanced Propagation Delays

• Designed for 4.5V to 5.5V Operating Range

• Low Noise: VOLP = 1.6V (Max)

• Pin and Function Compatible with Other Standard Logic Families

• Latchup Performance Exceeds 300mA

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

• Chip Complexity: 196 FETs or 49 Equivalent Gates

LOGIC DIAGRAM

DATA

INPUTS

D0

D1

D2

D3

D4

D5

D6

D7

18

17

14

13

8

7

4

3

1

OE

19

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

16

15

12

9

6

5

2

NONINVERTING

OUTPUTS

11

LE

OE

LE

Q

L

L

L

H

H

H

L

X

H

L

No Change

Z

INPUTS

OUTPUT

FUNCTION TABLE

D

H

L

X

X

MC74VHCT373A

DW SUFFIX

20–LEAD SOIC PACKAGE

CASE 751D–04

ORDERING INFORMATION

MC74VHCTXXXADW

MC74VHCTXXXADT

MC74VHCTXXXAM

SOIC

TSSOP

SOIC EIAJ

DT SUFFIX

20–LEAD TSSOP PACKAGE

CASE 948E–02

PIN ASSIGNMENT

Q2

D1

D0

Q0

OE

GND

Q3

D3

D2

Q1

5

4

3

2

1

10

9

8

7

6

14

15

16

17

18

19

20

11

12

13

Q6

D6

D7

Q7

VCC

LE

Q4

D4

D5

Q5

M SUFFIX

20–LEAD SOIC EIAJ PACKAGE

CASE 967–01