74HCT191D 查看數據表（PDF） - Philips Electronics
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74HCT191D 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; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
+25
min. typ. max.
74HC
−40 to +85
−40 to +125
UNIT
VCC
(V)
min. max. min. max.
WAVEFORMS
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tTHL/ tTLH
propagation delay
CP to Qn
propagation delay
CP to TC
propagation delay
CP to RC
propagation delay
CE to RC
propagation delay
Dn to Qn
propagation delay
PL to Qn
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
tW
clock pulse width
16 9
20
24
ns 4.5 Fig.10
HIGH or LOW
tW
parallel load pulse width 22 11
28
33
ns 4.5 Fig.15
LOW
trem
removal time
PL to CP
71
9
11
ns 4.5 Fig.15
tsu
set-up time
U/D to CP
41 20
51
62
ns 4.5 Fig.17
tsu
set-up time
Dn to PL
tsu
set-up time
CE to CP
20 9
25
30 18
38
30
ns 4.5 Fig.16
45
ns 4.5 Fig.17
th
hold time
U/D to CP
0 −18
0
0
ns 4.5 Fig.17
th
hold time
Dn to PL
th
hold time
CE to CP
0 −5
0
0 −10
0
0
ns 4.5 Fig.16
0
ns 4.5 Fig.17
fmax
maximum clock pulse 20 33
16
13
MHz 4.5 Fig.10
frequency
December 1990
11
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