Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary
counter; asynchronous reset
74HC/HCT161
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
UNIT LOAD COEFFICIENT
MR
CP
0.95
1.10
0.25
0.25
0.75
0.30
CEP
Dn
CET
PE
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
74HCT
TEST CONDITIONS
SYMBOL PARAMETER
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85
−40 to +125
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
CP to Qn
23
28
29
30
17
7
43
48
46
51
35
15
54
60
58
64
44
19
65
72
69
77
53
22
ns
ns
ns
ns
ns
ns
ns
ns
ns
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
Fig.8
t
PHL/ tPLH propagation delay
CP to TC
Fig.8
tPHL
propagation delay
MR to Qn
Fig.9
tPHL
propagation delay
MR to TC
Fig.9
tPHL/ tPLH propagation delay
CET to TC
Fig.10
Figs 8 and 10
Fig.8
t
THL/ tTLH output transition time
tW
clock pulse width
HIGH or LOW
16
20
20
7
20
25
25
24
30
30
tW
master reset pulse
width; LOW
10
6
Fig.9
trem
removal time
MR to CP
Fig.9
December 1990
9
NXP [ NXP ]
