74LVC169D View Datasheet(PDF) - Philips Electronics

Part Name

Description

MFG CO.

74LVC169D

Presettable synchronous 4-bit up/down binary counter

Philips Electronics 

Philips Semiconductors

Presettable synchronous 4-bit up/down

binary counter

Product specification

74LVC169

STATE DIAGRAM

0

1

2

3

4

15

5

14

6

13

7

12

11

10

9

8

COUNT DOWN

COUNT UP

SF00788

FUNCTION TABLE

OPERATING

INPUTS

OUTPUTS

MODES CP U/D CEP CET PE Dn Qn TC

Parallel load

(Dn→Qn)

↑

X

X

X ll

L

*

↑X

X

X XX H

*

Count Up

(increment)

↑

h

l

Count Down

(decrement)

↑

l

l

l

h

X

Count

Up

*

l

h

X

Count

Down

*

Hold

(do nothing)

↑

X

h

X

h X qn

*

↑X

X

X h X qn H

H = High voltage level steady state

h = High voltage level one setup time prior to the Low-to-High

clock transition

L = Low voltage level steady state

l = Low voltage level one setup time prior to the Low-to-High

clock transition

q = Lower case letters indicate the state of the referenced output

prior to the Low-to-High clock transition

X = Don’t care

↑ = Low-to-High clock transition

* = The TC is Low when CET is Low and the counter is at

Terminal Count.

Terminal Count Up is (HHHH) and Terminal Count Down is

(LLLL).

TYPICAL TIMING SEQUENCE

MR

PE

D0

D1

D2

D3

CP

CEP

CET

Q0

Q1

Q2

Q3

TC

12 13 14 15 0 1 2

RESET PRESET

COUNT

INHIBIT

SY00069

Typical timing sequence: reset outputs to zero; preset to binary

twelve; count to thirteen, fourteen, fifteen, zero, one, and two;

inhibit

1998 May 20

4

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