MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

1

REV 0

6/97

Dual 4-Bit Binary Ripple

Counter

The MC74VHC393 is an advanced high speed CMOS dual 4–bit binary

ripple counter fabricated with silicon gate CMOS technology. It achieves high

speed operation similar to equivalent Bipolar Schottky TTL while maintaining

CMOS low power dissipation.

This device consists of two independent 4–bit binary ripple counters with

parallel outputs from each counter stage. A

÷256 counter can be obtained by

cascading the two binary counters.

Internal flip–flops are triggered by high–to–low transitions of the clock

input. Reset for the counters is asynchronous and active–high. State

changes of the Q outputs do not occur simultaneously because of internal

ripple delays. Therefore, decoded output signals are subject to decoding

spikes and should not be used as clocks or as strobes except when gated

with the Clock of the VHC393.

The inputs tolerate voltages up to 7V, allowing the interface of 5V systems

to 3V systems.

• High Speed: fmax = 170MHz (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 = 0.8V (Max)

• Pin and Function Compatible with Other Standard Logic Families

• Latchup Performance Exceeds 300mA

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

• Chip Complexity: 236 FETs or 59 Equivalent Gates

LOGIC DIAGRAM

nQA

nQB

nQC

nQD

CPn

RDn

1, 13

2, 12

3, 11

4, 10

5, 9

6, 8

BINARY

COUNTER

FUNCTION TABLE

Inputs

Clock

Reset

Outputs

XH

L

H

L

No Change

L

L

No Change

↑

L

No Change

↓

L

Next State

MC74VHC393

D SUFFIX

14–LEAD SOIC PACKAGE

CASE 751A–03

DT SUFFIX

14–LEAD TSSOP PACKAGE

CASE 948G–01

ORDERING INFORMATION

MC74VHCXXXD

MC74VHCXXXDT

MC74VHCXXXM

SOIC

TSSOP

SOIC EIAJ

M SUFFIX

14–LEAD SOIC EIAJ PACKAGE

CASE 965–01

PIN ASSIGNMENT

11

12

13

14

8

9

10

5

4

3

2

1

7

6

2QB

2QA

RD2

CP2

VCC

2QD

2QC

1QB

1QA

RD1

CP1

GND

1QC

1QD