Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary
counter; asynchronous reset
74HC/HCT161
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
74HC
SYMBOL PARAMETER
UNIT
VCC
+25
−40 to +85
−40 to +125
WAVEFORMS
(V)
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
CP to Qn
61
22
18
190
38
32
240
48
41
285
57
48
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
2.0
4.5
6.0
Fig.8
t
PHL/ tPLH propagation delay
CP to TC
69
25
20
215
43
37
270
54
46
325
65
55
2.0
4.5
6.0
Fig.8
tPHL
propagation delay
MR to Qn
63
23
18
210
42
36
265
53
45
315
63
54
2.0
4.5
6.0
Fig.9
tPHL
propagation delay
MR to TC
63
23
18
220
44
37
275
55
47
330
66
56
2.0
4.5
6.0
Fig.9
t
PHL/ tPLH propagation delay
CET to TC
33
12
10
150
30
26
190
38
33
225
45
38
2.0
4.5
6.0
Fig.10
Figs 8 and 10
Fig.8
tTHL/ tTLH output transition time
19
7
6
75
15
13
95
19
16
110
22
19
2.0
4.5
6.0
tW
clock pulse width
HIGH or LOW
80
16
14
22
8
6
100
20
17
120
24
20
2.0
4.5
6.0
tW
master reset pulse
width; LOW
80
16
14
19
7
6
100
20
17
120
24
20
2.0
4.5
6.0
Fig.9
trem
tsu
tsu
removal time
MR to CP
100 19
125
25
21
150
30
26
2.0
4.5
6.0
Fig.9
20
17
7
6
set-up time
Dn to CP
80
16
14
25
9
7
100
20
17
120
24
20
2.0
4.5
6.0
Fig.11
Fig.11
set-up time
PE to CP
100 30
125
25
21
150
30
26
2.0
4.5
6.0
20
17
11
9
December 1990
7
NXP [ NXP ]
