Datasheet

1998 Jul 08 8
Philips Semiconductors Product specification
Dual retriggerable monostable
multivibrator with reset
74HC/HCT123
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
=t
f
= 6 ns; C
L
=50pF
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS/
NOTES
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
propagation delay
nR
D
, nA, nB to nQ
30 51 64 77 ns 4.5
C
EXT
= 0 pF;
R
EXT
=5kΩ
t
PLH
propagation delay
nR
D
, nA, nB to nQ
28 51 64 77 ns 4.5
C
EXT
= 0 pF;
R
EXT
=5kΩ
t
PHL
propagation delay
nR
D
to nQ (reset)
27 46 58 69 ns 4.5
C
EXT
= 0 pF;
R
EXT
=5kΩ
t
PLH
propagation delay
nR
D
to nQ (reset)
23 46 58 69 ns 4.5
C
EXT
= 0 pF;
R
EXT
=5kΩ
t
THL
/ t
TLH
output transition time 7 15 19 22 ns 4.5
t
W
trigger pulse width
nA = LOW
20 3 25 30 ns 4.5 Fig.7
t
W
trigger pulse width
nB = HIGH
20 5 25 30 ns 4.5 Fig.7
t
W
reset pulse width
nR
D
= LOW
20 7 25 30 ns 4.5 Fig.8
t
W
output pulse width
nQ = HIGH
nQ = LOW
450 −− µs 5.0
C
EXT
= 100 nF;
R
EXT
=10kΩ;
Figs 7 and 8
t
W
output pulse width
nQ = HIGH
nQ = LOW
75 −− ns 5.0
C
EXT
= 0 pF;
R
EXT
=5kΩ;
note 1; Figs 7 and 8
t
rt
retrigger time
nA, nB
110 −− ns 5.0
C
EXT
= 0 pF;
R
EXT
=5kΩ;
note 2; Fig.7
R
EXT
external timing
resistor
2 1000 −− kΩ5.0 Fig.9
C
EXT
external timing
capacitor
no limits pF 5.0 Fig.9; note 3