74HC191 查看數據表（PDF） - Philips Electronics
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74HC191 Datasheet PDF : 14 Pages
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Philips Semiconductors
Presettable synchronous 4-bit binary
up/down counter
Product specification
74HC/HCT191
SYMBOL
PARAMETER
trem
removal time
PL to CP
tsu
set-up time
U/D to CP
tsu
set-up time
Dn to PL
tsu
set-up time
CE to CP
th
hold time
U/D to CP
th
hold time
Dn to PL
th
hold time
CE to CP
fmax
maximum clock pulse
frequency
Tamb (°C)
TEST CONDITIONS
+25
min. typ. max.
74HC
−40 to +85
−40 to +125
UNIT
VCC
(V)
min. max. min. max.
WAVEFORMS
35 8
45
55
ns 2.0 Fig.15
73
9
11
4.5
62
8
9
6.0
205 50
255
310
ns 2.0 Fig.17
41 18
51
62
4.5
35 14
43
53
6.0
100 19
125
150
ns 2.0 Fig.16
20 7
25
30
4.5
17 6
21
26
6.0
140 44
175
210
ns 2.0 Fig.17
28 16
35
42
4.5
24 13
30
36
6.0
0 −39
0
0 −14
0
0 −11
0
0 −11
0
0 −4
0
0 −3
0
0 −28
0
0 −10
0
0 −8
0
4.0 11
3.2
20 33
16
24 39
19
0
ns 2.0 Fig.17
0
4.5
0
6.0
0
ns 2.0 Fig.16
0
4.5
0
6.0
0
ns 2.0 Fig.17
0
4.5
0
6.0
2.6
MHz 2.0 Fig.10
13
4.5
15
6.0
December 1990
9
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