74161 데이터 시트보기 (PDF) - Philips Electronics
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74161 Datasheet PDF : 12 Pages
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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
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
MR
CP
CEP
Dn
CET
PE
UNIT LOAD COEFFICIENT
0.95
1.10
0.25
0.25
0.75
0.30
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
SYMBOL PARAMETER
74HCT
+25
−40 to +85
min. typ. max. min. max.
tPHL/ tPLH
tPHL/ tPLH
propagation delay
CP to Qn
propagation delay
CP to TC
23 43
54
28 48
60
tPHL
propagation delay
MR to Qn
tPHL
propagation delay
MR to TC
29 46
58
30 51
64
tPHL/ tPLH propagation delay
CET to TC
17 35
44
tTHL/ tTLH output transition time
7 15
19
TEST CONDITIONS
−40 to +125
UNIT
VCC
(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
tW
clock pulse width
16 7
HIGH or LOW
20
24
ns 4.5 Fig.8
tW
master reset pulse 20 10
25
30
ns 4.5 Fig.9
width; LOW
trem
removal time
MR to CP
20 6
25
30
ns 4.5 Fig.9
December 1990
9
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