74F161A 查看數據表（PDF） - Philips Electronics

零件编号

产品描述 (功能)

比赛名单

74F161A

4-bit binary counter

Philips Electronics 

Philips Semiconductors

4-bit binary counters

Product specification

74F161A, 74F163A

74F163A MODE SELECT – FUNCTION TABLE

INPUTS

OUTPUTS

OPERATING MODE

SR

CP

CEP

CET

PE

Dn

Qn

TC

l

↑

X

X

X

X

L

L

Reset (clear)

h

↑

X

X

l

l

L

L

Parallel load

h

↑

X

X

l

h

H

(2)

h

↑

h

h

h

X

count

(2)

Count

h

h

H=

h=

L=

l=

qn =

X=

↑=

(1) =

(2) =

X

l

X

h

X

qn

(2)

Hold (do nothing)

X

X

l

h

X

qn

L

High voltage level

High voltage level one setup prior to the Low-to-High clock transition

Low voltage level

Low voltage level one setup prior to the Low-to-High clock transition

Lower case letters indicate the state of the referenced output prior to the Low-to-High clock transition

Don’t care

Low-to-High clock transition

The TC output is High when CET is High and the counter is at Terminal Count (HHHH for 74F161A)

The TC output is High when CET is High and the counter is at Terminal Count (HHHH for 74F163A)

74F161A LOGIC DIAGRAM

2

CP

1

MR

9

PE

10

CET

7

CEP

3

D0

D RQ

CP Q

4

D1

D RQ

CP Q

5

D2

D RQ

CP Q

6

D3

D RQ

CP Q

VCC = Pin 16

GND = Pin 8

1996 Jan 29

5

14

Q0

13

Q1

12

Q2

11

Q3

15

TC

SF00662

Share Link: