© Semiconductor Components Industries, LLC, 2000

March, 2000 – Rev. 8

1

Publication Order Number:

MC74HC161A/D

MC74HC161A,

MC74HC163A

Presettable Counters

High–Performance Silicon–Gate CMOS

The MC74HC161A and HC163A are identical in pinout to the

LS161 and LS163. The device inputs are compatible with standard

CMOS outputs; with pullup resistors, they are compatible with

LSTTL outputs.

The HC161A and HC163A are programmable 4–bit binary counters

with asynchronous and synchronous reset, respectively.

No. 7A

Device

Count

Mode

Reset Mode

HC161A

Binary

Asynchronous

HC163A

Binary

Synchronous

LOGIC DIAGRAM

PIN 16 = VCC

PIN 8 = GND

11

12

13

14

Q0

Q1

Q2

Q3

15

RIPPLE

CARRY

OUT

BCD OR

BINARY

OUTPUT

3

4

5

6

P0

P1

P2

P3

2

CLOCK

RESET

LOAD

ENABLE P

ENABLE T

COUNT

ENABLES

PRESET

DATA

INPUTS

1

9

7

10

Inputs

Output

Clock

Reset*

Load

Enable P

Enable T

Q

L

X

X

X

Reset

H

L

X

X

Load Preset Data

H

H

H

H

Count

H

H

L

X

No Count

H

H

X

L

No Count

FUNCTION TABLE

*HC163A only. HC161A is an Asynchronous Reset Device

H = high level, L = low level, X = don’t care

PIN ASSIGNMENT

13

14

15

16

9

10

11

12

5

4

3

2

1

8

7

6

RESET

P0

CLOCK

GND

Q1

Q0

RIPPLE

CARRY OUT

VCC

P1

P2

P3

ENABLE P

Q2

Q3

ENABLE T

LOAD

SO–16

D SUFFIX

CASE 751B

http://onsemi.com

1

16

PDIP–16

N SUFFIX

CASE 648

1

16

MARKING

DIAGRAMS

1

16

MC74HC16xAN

AWLYYWW

1

16

HC16xA

AWLYWW

A

= Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

Device

Package

Shipping

ORDERING INFORMATION

MC74HC16xAN

PDIP–16

2000 / Box

MC74HC16xAD

SOIC–16

48 / Rail

MC74HC16xADR2

SOIC–16

2500 / Reel