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參數(shù)資料
| 型號： | 933897000623 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計數(shù)器 |
| 英文描述： | F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16 |
| 封裝： | 3.90 MM, PLASTIC, MS-012AC, SOT-109-1, SO-16 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 104K |
| 代理商： | 933897000623 |
Philips Semiconductors
Product specification
74F191
Up/Down binary counter with reset and ripple clock
1995 Jul 17
4
MODE SELECT — FUNCTION TABLE
INPUTS
OUTPUTS
OPERATING MODE
PL
U/D
CE
CP
Dn
Qn
L
X
L
H
L
H
Parallel load
H
L
l
↑
X
Count up
H
l
↑
X
Count down
H
X
H
X
No change
Hold (do nothing)
TC AND RC FUNCTION TABLE
INPUTS
TERMINAL COUNT STATE
OUTPUTS
U/D
CE
CP
Q0
Q1
Q2
Q3
TC
RC
H
X
H
L
H
L
H
X
H
L
H
L
H
X
L
H
X
L
H
L
H
H = High voltage level steady state
L = Low voltage level steady state
X = Don’t care
= Low pulse
↑ = Low-to-High clock transition
l
= Low voltage level one set-up time prior to the Low-to-High clock transition
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