NXP Semiconductors
74HC123; 74HCT123
Dual retriggerable monostable multivibrator with reset
6. Functional description
Table 3.
Input
nRD
L
X
X
H
H
↑
[1]
Function table
Output
nA
X
H
X
L
↓
L
nB
X
X
L
↑
H
H
nQ
L
L
L
nQ
H
H
H
H = HIGH voltage level; L = LOW voltage level; X = don’t care;
↑
= LOW-to-HIGH transition;
↓
= HIGH-to-LOW transition;
= one HIGH level output pulse;
= one LOW level output pulse.
[2]
If the monostable was triggered before this condition was established, the pulse will continue as programmed.
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
DIP16 package
SO16 package
SSOP16 package
TSSOP16 package
DHVQFN16 package
[1]
[2]
[3]
[4]
For DIP16 package: P
tot
derates linearly with 12 mW/K above 70
°C.
For SO16 package: P
tot
derates linearly with 8 mW/K above 70
°C.
For SSOP16 and TSSOP16 packages: P
tot
derates linearly with 5.5 mW/K above 60
°C.
For DHVQFN16 package: P
tot
derates linearly with 4.5 mW/K above 60
°C.
Conditions
V
I
<
−0.5
V or V
I
> V
CC
+ 0.5 V
V
O
<
−0.5
V or V
O
> V
CC
+ 0.5 V
except for pins nREXT/CEXT;
V
O
=
−0.5
V to (V
CC
+ 0.5 V)
Min
−0.5
-
-
-
-
-
−65
-
-
-
-
-
Max
+7
±20
±20
±25
50
−50
+150
750
500
500
500
500
Unit
V
mA
mA
mA
mA
mA
°C
mW
mW
mW
mW
mW
74HC_HCT123_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 13 July 2009
5 of 24
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