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零件编号
产品描述 (功能)
74HC191 查看數據表(PDF) - Philips Electronics
零件编号
产品描述 (功能)
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74HC191
Presettable synchronous 4-bit binary up/down counter
Philips Electronics
74HC191 Datasheet PDF : 14 Pages
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Philips Semiconductors
Presettable synchronous 4-bit binary
up/down counter
Product specification
74HC/HCT191
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
T
amb
(
°
C)
TEST CONDITIONS
SYMBOL
PARAMETER
+
25
min. typ. max.
74HC
−
40 to
+
85
−
40 to
+
125
UNIT
V
CC
(V)
min. max. min. max.
WAVEFORMS
t
PHL
/ t
PLH
t
PHL
/ t
PLH
t
PHL
/ t
PLH
t
PHL
/ t
PLH
t
PHL
/ t
PLH
t
PHL
/ t
PLH
t
PHL
/ t
PLH
t
PHL
/ t
PLH
t
THL
/ t
TLH
propagation delay
CP to Q
n
propagation delay
CP to TC
propagation delay
CP to RC
propagation delay
CE to RC
propagation delay
D
n
to Q
n
propagation delay
PL to Q
n
propagation delay
U/D to TC
propagation delay
U/D to RC
output transition time
26 48
32 51
19 35
19 33
22 44
27 46
23 45
24 45
7 15
60
72 ns 4.5 Fig.10
64
77 ns 4.5 Fig.10
44
53 ns 4.5 Fig.11
41
50 ns 4.5 Fig.11
55
66 ns 4.5 Fig.12
58
69 ns 4.5 Fig.13
56
68 ns 4.5 Fig.14
56
68 ns 4.5 Fig.14
19
22 ns 4.5 Fig.15
t
W
clock pulse width
16 9
20
24
ns 4.5 Fig.10
HIGH or LOW
t
W
parallel load pulse width 22 11
28
33
ns 4.5 Fig.15
LOW
t
rem
removal time
PL to CP
71
9
11
ns 4.5 Fig.15
t
su
set-up time
U/D to CP
41 20
51
62
ns 4.5 Fig.17
t
su
set-up time
D
n
to PL
t
su
set-up time
CE to CP
20 9
25
30 18
38
30
ns 4.5 Fig.16
45
ns 4.5 Fig.17
t
h
hold time
U/D to CP
0
−
18
0
0
ns 4.5 Fig.17
t
h
hold time
D
n
to PL
t
h
hold time
CE to CP
0
−
5
0
0
−
10
0
0
ns 4.5 Fig.16
0
ns 4.5 Fig.17
f
max
maximum clock pulse 20 33
16
13
MHz 4.5 Fig.10
frequency
December 1990
11
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