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