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74HC_HCT423_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 24 July 2008
5 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
6.
Functional description
[1]
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 multivibrator was triggered before this condition was established, the pulse will continue as programmed.
7.
Limiting values
[1]
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2]
For DIP16 packages: above 70
°C the value of P
tot derates linearly at 12 mW/K.
[3]
For SO16 packages: above 70
°C the value of P
tot derates linearly at 8 mW/K;
For SSOP16 and TSSOP16 packages: above 60
°C the value of P
tot derates linearly at 5.5 mW/K;
For DHVQFN16 packages: above 60
°C the value of P
tot derates linearly at 4.5 mW/K.
Table 3.
Function table[1]
Input
Output
nRD
nA
nB
nQ
nQ
L
XXL
H
XH
XL[2]
H[2]
XXL
L[2]
H[2]
HL
H
H
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
Parameter
Conditions
Min
Max
Unit
VCC
supply voltage
−0.5
+7
V
IIK
input clamping current
VI < −0.5 V or VI >VCC + 0.5 V
[1] -
±20
mA
IOK
output clamping current
VO < −0.5 V or VO >VCC + 0.5 V
[1] -
±20
mA
IO
output current
−0.5 V < V
O < VCC + 0.5 V
-
±25
mA
ICC
supply current
-
50
mA
IGND
ground current
−50
-
mA
Tstg
storage temperature
−65
+150
°C
Ptot
total power dissipation
DIP16 package
[2] -
750
mW
SO16, SSOP16, TSSOP16 and
DHVQFN16 packages
[3] -
500
mW


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