參數(shù)資料
型號： 935187530118
廠商： NXP SEMICONDUCTORS
元件分類： 諧振器
英文描述： HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16
封裝： PLASTIC, TSSOP-16
文件頁數(shù)： 12/13頁
文件大小： 142K
代理商： 935187530118
September 1993
8
Philips Semiconductors
Product specication
Dual retriggerable precision monostable
multivibrator
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.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
INPUT
UNIT LOAD COEFFICIENT
nA0,nA1
nRD
0.50
0.65
SYMBOL
PARAMETER
Tamb (°C)
UNIT
TEST CONDITIONS
74HCT
VCC
(V)
OTHER
+25
40 to +85
40 to +125
min.
typ.
max.
min.
max.
min.
max.
tPLH
propagation delay
nA0,nA1 to nQ
35
60
75
90
ns
4.5
Fig.8
tPHL
propagation delay
nA0,nA1 to nQ
35
60
75
90
ns
4.5
Fig.8
tPHL
propagation delay
nRD to nQ
35
60
75
90
ns
4.5
Fig.8
tPLH
propagation delay
nRD to nQ
35
60
75
90
ns
4.5
Fig.8
tTHL/ tTLH
output transition time
7
15
19
21
ns
4.5
Fig.8
tW
nA0 pulse width
LOW
20
11
25
30
ns
4.5
Fig.8
tW
nA1 pulse width
HIGH
16
5
20
24
ns
4.5
Fig.8
tW
nRD pulse width
LOW
20
11
25
30
ns
4.5
Fig.8
tW
nQ, nQ pulse width
HIGH or LOW
0.63 0.70
0.77
0.602 0.798 0.595 0.805 ms
5.0
Fig.8; Rt = 10 k;
Ct = 0.1 F
trem
removal time
RD to nA0, nA1
7
2
9
11
ns
4.5
Fig.8
trt
retrigger time
nA0,nA1
80+X
ns
4.5
Fig.8
X=CEXT /
(4.5
× VCC)
REXT
external timing
resistor
2
1000
k
5.0
CEXT
external timing
capacitor
no limits
pF
5.0
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