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
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
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 propagation delay
CP to Qn
tPHL/ tPLH propagation delay
CP to TC
72 220
26 44
21 37
83 255
30 51
24 43
275
330 ns 2.0 Fig.10
55
66
4.5
47
56
6.0
320
395 ns 2.0 Fig.10
64
77
4.5
54
65
6.0
tPHL/ tPLH propagation delay
CP to RC
47 150
17 30
14 26
190
225 ns 2.0 Fig.11
38
45
4.5
33
38
6.0
tPHL/ tPLH propagation delay
CE to RC
tPHL/ tPLH propagation delay
Dn to Qn
33 130
12 26
10 22
61 220
22 44
18 37
165
195 ns 2.0 Fig.11
33
39
4.5
28
33
6.0
275
330 ns 2.0 Fig.12
55
66
4.5
47
56
6.0
tPHL/ tPLH propagation delay
PL to Qn
61 220
22 44
18 37
275
330 ns 2.0 Fig.13
55
66
4.5
47
56
6.0
tPHL/ tPLH propagation delay
U/D to TC
tPHL/ tPLH propagation delay
U/D to RC
44 190
16 38
13 32
50 210
18 42
14 36
240
285 ns 2.0 Fig.14
48
57
4.5
41
48
6.0
265
315 ns 2.0 Fig.14
53
63
4.5
45
54
6.0
tTHL/ tTLH output transition time
19 75
7 15
6 13
95
110 ns 2.0 Fig.15
19
22
4.5
16
19
6.0
tW
clock pulse width
125 28
155
195
ns 2.0 Fig.10
HIGH or LOW
25 10
31
39
4.5
21 8
26
33
6.0
tW
parallel load pulse width 100 22
125
150
ns 2.0 Fig.15
LOW
20 8
25
30
4.5
17 6
21
26
6.0
December 1990
8
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