74HCT4518 查看數據表（PDF） - Philips Electronics
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74HCT4518 Datasheet PDF : 7 Pages
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Philips Semiconductors
Dual synchronous BCD counter
Product specification
74HC/HCT4518
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
nCP0, nCP1
nMR
UNIT LOAD COEFFICIENT
0.80
1.50
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH
tPHL
tTHL/ tTLH
propagation delay
nCP0, nCP1 to nQn
propagation delay
nMR to nQn
output transition time
28 53
66
17 35
44
7 15
19
80 ns 4.5 Fig.9
53 ns 4.5 Fig.8
22 ns 4.5 Fig.9
tW
clock pulse width
20 11
25
30
HIGH or LOW
tW
master reset pulse width 20 11
25
30
HIGH
trem
removal time
0 −11
0
0
nMR to nCP0, nCP1
tsu
set-up time
nCP1 to nCP0;
nCP0 to nCP1
16 5
20
24
fmax
maximum clock pulse 25 50
20
17
frequency
nCP0, nCP1
ns 4.5 Fig.8
ns 4.5 Fig.8
ns 4.5 Fig.8
ns 4.5 Fig.7
MHz 4.5 Fig.8
December 1990
6
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