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 kΩ;
Fig.10
t
PLH
propagation delay (trigger)
nB to nQ
24 42 53 63 ns 4.5 C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PHL
propagation delay (trigger)
nA to nQ
26 44 55 66 ns 4.5 C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PHL
propagation delay (trigger)
nB to nQ
21 35 44 53 ns 4.5 C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PHL
propagation delay (trigger)
nR
D
to nQ
26 43 54 65 ns 4.5 C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.10
t
PHL
propagation delay (reset)
nR
D
to nQ
26 43 54 65 ns 4.5 C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.11
t
PLH
propagation delay (reset)
nR
D
to nQ
31 51 64 77 ns 4.5 C
EXT
= 0 pF;
R
EXT
=5 kΩ;
Fig.11
t
THL
/ t
TLH
output transition time 7 15 19 22 ns 4.5 Fig.10
t
W
trigger pulse width
nA = LOW
20 13 25 30 ns 4.5 Fig.10
t
W
trigger pulse width
nB = HIGH
20 13 25 30 ns 4.5 Fig.10
t
W
pulse width
nR
D
= LOW
22 13 28 33 ns 4.5 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
t
W
trigger pulse width
nQ or nQ
140 −− ns 4.5 C
EXT
= 28 pF;
R
EXT
=2 kΩ;
Fig.10
t
W
trigger pulse width
nQ or nQ
1.5 −− µs 4.5 C
EXT
= 1 nF;
R
EXT
= 2 kΩ;
Fig.10
