參數(shù)資料
型號: 74HC221
廠商: NXP Semiconductors N.V.
英文描述: Dual non-retriggerable monostable multivibrator with reset
中文描述: 雙非retriggerable帶復(fù)位單穩(wěn)態(tài)觸發(fā)器
文件頁數(shù): 9/15頁
文件大?。?/td> 250K
代理商: 74HC221
December 1990
9
Philips Semiconductors
Product specification
Dual non-retriggerable monostable
multivibrator with reset
74HC/HCT221
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
SYMBOL
PARAMETER
T
amb
(
°
C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+
25
40 to
+
85
40 to
+
125
min
typ
max
min
max.
min.
max.
t
PLH
propagation delay (trigger)
nA, nR
D
to nQ
30
50
63
75
ns
4.5
C
EXT
= 0 pF;
R
EXT
= 5 k
;
Fig.10
C
EXT
= 0 pF;
R
EXT
= 5 k
;
Fig.10
C
EXT
= 0 pF;
R
EXT
= 5 k
;
Fig.10
C
EXT
= 0 pF;
R
EXT
= 5 k
;
Fig.10
C
EXT
= 0 pF;
R
EXT
= 5 k
;
Fig.10
C
EXT
= 0 pF;
R
EXT
= 5 k
;
Fig.11
C
EXT
= 0 pF;
R
EXT
= 5 k
;
Fig.11
Fig.10
t
PLH
propagation delay (trigger)
nB to nQ
24
42
53
63
ns
4.5
t
PHL
propagation delay (trigger)
nA to nQ
26
44
55
66
ns
4.5
t
PHL
propagation delay (trigger)
nB to nQ
21
35
44
53
ns
4.5
t
PHL
propagation delay (trigger)
nR
D
to nQ
26
43
54
65
ns
4.5
t
PHL
propagation delay (reset)
nR
D
to nQ
26
43
54
65
ns
4.5
t
PLH
propagation delay (reset)
nR
D
to nQ
31
51
64
77
ns
4.5
t
THL
/ t
TLH
output transition time
7
15
19
22
ns
4.5
t
W
trigger pulse width
nA = LOW
trigger pulse width
nB = HIGH
pulse width
nR
D
= LOW
output pulse width
nQ = LOW
nQ = HIGH
trigger pulse width
nQ or nQ
20
13
25
30
ns
4.5
Fig.10
t
W
20
13
25
30
ns
4.5
Fig.10
t
W
22
13
28
33
ns
4.5
Fig.8
t
W
630
700 770
602
798
595
805
μ
s
5.0
C
EXT
= 100 nF;
R
EXT
= 10 k
;
Fig.10
C
EXT
= 28 pF;
R
EXT
= 2 k
;
Fig.10
C
EXT
= 1 nF;
R
EXT
= 2 k
;
Fig.10
t
W
140
ns
4.5
t
W
trigger pulse width
nQ or nQ
1.5
μ
s
4.5
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