December 1990 6
Philips Semiconductors Product specification
Dual non-retriggerable monostable
multivibrator with reset
74HC/HCT221
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: standard (except for nR
EXT
/C
EXT
)
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS
+25 −40 to +85 −40 to +125
min typ max. min max. min. max.
t
PLH
propagation delay (trigger)
nA, nB to nQ
72
26
21
220
44
37
275
55
47
330
66
56
ns 2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PLH
propagation delay (trigger)
nR
D
to nQ
80
29
23
245
49
42
305
61
52
370
74
63
ns 2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PHL
propagation delay (trigger)
nA, nB to nQ
58
21
17
180
36
31
225
45
38
270
54
46
ns 2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PHL
propagation delay (trigger)
nR
D
to nQ
63
23
18
195
39
33
245
49
42
295
59
50
ns 2.0
4.5
6,0
C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PLH
propagation delay (reset)
nR
D
to nQ
66
24
19
200
40
34
250
50
43
300
60
51
ns 2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.11
t
PLH
propagation delay (reset)
nR
D
to nQ
58
21
17
180
36
31
225
45
38
270
54
46
ns 2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.11
t
THL
/
t
TLH
output transition time 19
7
6
75
15
13
95
19
16
110
22
19
ns 2.0
4.5
6.0
Fig.10
t
W
trigger pulse width
nA = LOW
75
15
13
25
9
7
95
19
16
110
22
19
ns 2.0
4.5
6.0
Fig.7
t
W
trigger pulse width
nB = HIGH
90
18
15
30
11
9
115
23
20
135
27
23
ns 2.0
4.5
6.0
Fig.7
t
W
trigger pulse width
nR
D
= LOW
75
15
13
25
9
7
95
19
16
110
22
19
ns 2.0
4.5
6.0
Fig.8
t
W
output pulse width
nQ = LOW
nQ = HIGH
630 700 770 602 798 595 805 µs 5.0 C
EXT
= 100 nF;
R
EXT
= 10 kΩ;
Fig.10
