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參數資料
| 型號： | 933783380005 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計數器 |
| 英文描述： | HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, UUC |
| 封裝： | DIE |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 80K |
| 代理商： | 933783380005 |
December 1990
4
Philips Semiconductors
Product specication
Presettable synchronous 4-bit binary
counter; asynchronous reset
74HC/HCT161
FUNCTION TABLE
Note
1. The TC output is HIGH when CET is HIGH and the counter is at terminal count (HHHH).
H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
q = lower case letters indicate the state of the referenced output one set-up time prior to the
LOW-to-HIGH CP transition
X = don’t care
↑ = LOW-to-HIGH CP transition
OPERATING MODE
INPUTS
OUTPUTS
MR
CP
CEP
CET
PE
Dn
Qn
TC
reset (clear)
L
X
L
parallel load
H
↑
X
I
h
L
H
L
(1)
count
H
↑
h
X
count
(1)
hold
(do nothing)
H
X
I
X
I
h
X
qn
(1)
L
Fig.4 Functional diagram.
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