NXP Semiconductors
74HC123; 74HCT123
Dual retriggerable monostable multivibrator with reset
Table 7.
Dynamic characteristics
…continued
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF unless otherwise specified; for test circuit see
Figure 12.
Symbol Parameter
t
rtrig
retrigger time
Conditions
Min
nA, nB; C
EXT
= 0 pF;
R
EXT
= 5 kΩ; V
CC
= 5.0 V;
see
25
°C
Typ
110
Max
-
-
−40 °C
to +85
°C −40 °C
to +125
°C
Unit
Min
-
Max
-
Min
-
Max
-
ns
R
EXT
external timing see
resistor
V
CC
= 2.0 V
V
CC
= 5.0 V
external timing V
CC
= 5.0 V; see
capacitor
power
dissipation
capacitance
HIGH to LOW
propagation
delay
per monostable;
V
I
= GND to V
CC
10
2
-
-
-
-
-
54
1000
1000
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
kΩ
kΩ
pF
pF
C
EXT
C
PD
74HCT123
t
PHL
nRD, nA, nB to nQ or nQ;
C
EXT
= 0 pF; R
=
5 kΩ; see
V
CC
= 4.5 V
V
CC
= 5 V; C
L
= 15 pF
nRD (reset) to nQ or nQ;
C
EXT
= 0 pF;
R
EXT
= 5 kΩ;
see
V
CC
= 4.5 V
V
CC
= 5 V; C
L
= 15 pF
t
PLH
LOW to HIGH
propagation
delay
nRD, nA, nB to nQ or nQ;
C
EXT
= 0 pF;
R
EXT
= 5 kΩ;
see
V
CC
= 4.5 V
V
CC
= 5 V; C
L
= 15 pF
nRD (reset) to nQ or nQ;
C
EXT
= 0 pF; R
EXT
=
5 kΩ; see
V
CC
= 4.5 V
V
CC
= 5 V; C
L
= 15 pF
t
t
output
V
CC
= 4.5 V; see
transition time
-
-
30
26
51
-
-
-
64
-
-
-
77
-
ns
ns
-
-
27
23
46
-
-
-
58
-
-
-
69
-
ns
ns
-
-
28
26
51
-
-
-
64
-
-
-
77
-
ns
ns
-
-
-
23
23
7
46
-
15
-
-
-
58
-
19
-
-
-
69
-
22
ns
ns
ns
74HC_HCT123_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 13 July 2009
9 of 24
PHILIPS [ NXP SEMICONDUCTORS ]
