Datasheet

December 1990 8
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications” .
Output capability: standard
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
=50pF
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
CP to Q
n
72
26
21
220
44
37
275
55
47
330
66
56
ns 2.0
4.5
6.0
Fig.10
t
PHL
/ t
PLH
propagation delay
CP to TC
83
30
24
255
51
43
320
64
54
395
77
65
ns 2.0
4.5
6.0
Fig.10
t
PHL
/ t
PLH
propagation delay
CP to RC
47
17
14
150
30
26
190
38
33
225
45
38
ns 2.0
4.5
6.0
Fig.11
t
PHL
/ t
PLH
propagation delay
CE to RC
33
12
10
130
26
22
165
33
28
195
39
33
ns 2.0
4.5
6.0
Fig.11
t
PHL
/ t
PLH
propagation delay
D
n
to Q
n
61
22
18
220
44
37
275
55
47
330
66
56
ns 2.0
4.5
6.0
Fig.12
t
PHL
/ t
PLH
propagation delay
PL to Q
n
61
22
18
220
44
37
275
55
47
330
66
56
ns 2.0
4.5
6.0
Fig.13
t
PHL
/ t
PLH
propagation delay
U/D to TC
44
16
13
190
38
32
240
48
41
285
57
48
ns 2.0
4.5
6.0
Fig.14
t
PHL
/ t
PLH
propagation delay
U/D to RC
50
18
14
210
42
36
265
53
45
315
63
54
ns 2.0
4.5
6.0
Fig.14
t
THL
/ t
TLH
output transition time 19
7
6
75
15
13
95
19
16
110
22
19
ns 2.0
4.5
6.0
Fig.15
t
W
clock pulse width
HIGH or LOW
125
25
21
28
10
8
155
31
26
195
39
33
ns 2.0
4.5
6.0
Fig.10
t
W
parallel load pulse width
LOW
100
20
17
22
8
6
125
25
21
150
30
26
ns 2.0
4.5
6.0
Fig.15