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參數(shù)資料
| 型號： | 933669460652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計數(shù)器 |
| 英文描述： | HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDIP16 |
| 封裝： | SOT-38-1, DIP-16 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 102K |
| 代理商： | 933669460652 |
December 1990
5
Philips Semiconductors
Product specication
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
FUNCTION TABLE
TC AND RC FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
I
= LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
X = don’t care
↑ = LOW-to-HIGH CP transition
= one LOW level pulse
= TC goes LOW on a LOW-to-HIGH CP transition
OPERATING MODE
INPUTS
OUTPUTS
PL
U/D
CE
CP
Dn
Qn
parallel load
L
X
L
H
L
H
count up
H
L
I
↑
X
count up
count down
H
I
↑
X
count down
hold (do nothing)
HXHX
X
no change
INPUTS
TERMINAL COUNT STATE
OUTPUTS
U/D
CE
CP
Q0
Q1
Q2
Q3
TC
RC
H
L
H
L
H
L
X
H
L
H
L
H
L
H
L
H
L
H
Fig.4 Functional diagram.
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