Datasheet

1998 Jul 08 6
Philips Semiconductors Product specification
Dual retriggerable monostable
multivibrator with reset
74HC/HCT123
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
=50pF
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS/
NOTES
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PLH
propagation delay
nR
D
, nA, nB to nQ
83
30
24
255
51
43
320
64
54
385
77
65
ns
2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5kΩ
t
PLH
propagation delay
nR
D
, nA, nB to nQ
83
30
24
255
51
43
320
64
54
385
77
65
ns
2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5kΩ
t
PHL
propagation delay
nR
D
to nQ (reset)
66
24
19
215
43
37
270
54
46
325
65
55
ns
2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5kΩ
t
PLH
propagation delay
nR
D
to nQ (reset)
66
24
19
215
43
37
270
54
46
325
65
55
ns
2.0
4.5
6.0
C
EXT
= 0 pF;
R
EXT
=5kΩ
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
t
W
trigger pulse width
nA = LOW
100
20
17
8
3
2
125
25
21
150
30
26
ns
2.0
4.5
6.0
Fig.7
t
W
trigger pulse width
nB = HIGH
100
20
17
17
6
5
125
25
21
150
30
26
ns
2.0
4.5
6.0
Fig.7
t
W
reset pulse width
nR
D
= LOW
100
20
17
14
5
4
125
25
21
150
30
26
ns
2.0
4.5
6.0
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
10
2
1000
1000
−−kΩ
2.0
5.0
Fig.9
C
EXT
external timing
capacitor
no limits pF 5.0 Fig.9; note 3