74HC161 Datasheet, PDF (9/12 Pages) NXP Semiconductors – Presettable synchronous 4-bit binary counter; asynchronous reset

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