74LVC169(2009) 查看數據表（PDF） - NXP Semiconductors.

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74LVC169
(Rev.:2009)

Presettable synchronous 4-bit up/down binary counter

NXP Semiconductors. 

NXP Semiconductors

74LVC169

Presettable synchronous 4-bit up/down binary counter

6. Functional description

Table 3. Function table[1]

Operating modes

Input

CP

U/D

CEP

CET

PE

Dn

Parallel load (Dn to Qn)

↑

X

X

X

I

I

↑

X

X

X

l

h

Count up (increment)

↑

h

I

I

h

X

Count down (decrement) ↑

I

I

I

h

X

Hold (do nothing)

↑

X

h

X

h

X

↑

X

X

X

h

X

[1] H = HIGH voltage level steady state

h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition

L = LOW voltage level steady state

l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition

qn = Lower case letters indicate state of 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)

Output

Qn

TC

L

*

H

*

count up

*

count down *

qn

*

qn

H

Fig 6. State diagram

0

1

2

15

14

13

12 11 10

count down

count up

3

4

5

6

7

9

8

001aaa647

74LVC169_5

Product data sheet

Rev. 05 — 8 June 2009

© NXP B.V. 2009. All rights reserved.

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