74HC/HCT4538 데이터 시트보기 (PDF) - Philips Electronics
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74HC/HCT4538 Datasheet PDF : 14 Pages
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Philips Semiconductors
Dual retriggerable precision monostable
multivibrator
Product specification
74HC/HCT4538
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
nA0, nA1
nRD
0.50
0.65
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 OTHER
(V)
min. typ. max. min. max. min. max.
tPLH
propagation delay
35 60
75
nA0, nA1 to nQ
tPHL
propagation delay
35 60
75
nA0, nA1 to nQ
tPHL
propagation delay
35 60
75
nRD to nQ
tPLH
propagation delay
35 60
75
nRD to nQ
tTHL/ tTLH output transition time
7
15
19
90 ns 4.5 Fig.8
90 ns 4.5 Fig.8
90 ns 4.5 Fig.8
90 ns 4.5 Fig.8
21 ns 4.5 Fig.8
tW
nA0 pulse width
20 11
25
30
ns
LOW
tW
nA1 pulse width
16 5
HIGH
20
24
ns
tW
nRD pulse width
20 11
25
30
ns
LOW
tW
nQ, nQ pulse width 0.63 0.70 0.77 0.602 0.798 0.595 0.805 ms
HIGH or LOW
trem
removal time
72
9
RD to nA0, nA1
trt
retrigger time
− 80+X
−
nA0, nA1
11
ns
−
ns
REXT
external timing
2
1000
kΩ
resistor
CEXT
external timing
capacitor
no limits
pF
September 1993
8
4.5 Fig.8
4.5 Fig.8
4.5 Fig.8
5.0 Fig.8; Rt = 10 kΩ;
Ct = 0.1 µF
4.5 Fig.8
4.5 Fig.8
X = CEXT /
(4.5 × VCC)
5.0
5.0
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