74VHC221ASJ Fairchild Semiconductor, 74VHC221ASJ Datasheet - Page 2
![MULTIVIBRATOR DUAL MONO 16SOP](/photos/6/56/65606/16-sop_pkg_sml.jpg)
74VHC221ASJ
Manufacturer Part Number
74VHC221ASJ
Description
MULTIVIBRATOR DUAL MONO 16SOP
Manufacturer
Fairchild Semiconductor
Series
74VHCr
Datasheet
1.74VHC221AMTCX.pdf
(12 pages)
Specifications of 74VHC221ASJ
Logic Type
Monostable
Independent Circuits
2
Schmitt Trigger Input
No
Propagation Delay
8.1ns
Current - Output High, Low
8mA, 8mA
Voltage - Supply
2 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (5.3mm Width), 16-SO, 16-SOEIIJ
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
Connection Diagram
Logic Symbol
Truth Table
H
L
X = Don’t Care
A
X
H
X
L
L
LOW Voltage Level
HIGH Voltage Level
HIGH-to-LOW Transition
LOW-to-HIGH Transition
Inputs
B
H
X
H
X
L
CLR
H
H
H
H
L
IEEE/IEC
Outputs
Q
L
L
L
Q
H
H
H
Output Enable
Inhibit
Inhibit
Output Enable
Output Enable
Reset
Function
2
Block Diagrams
Note A: Cx, Rx, Dx are external Capacitor, Resistor, and
Diode, respectively.
Note B: External clamping diode, Dx;
External capacitor is charged to V
state, i.e. when no trigger is applied.
If the supply voltage is turned off, Cx discharges mainly
through the internal (parasitic) diode. If Cx is sufficiently
large and V
ity of damaging the IC through in rush current or latch-
up. If the capacitance of the supply voltage filter is large
enough and V
automatically limited and damage to the IC is avoided.
The maximum value of forward current through the para-
sitic diode is ±20 mA. In the case of a large Cx, the limit
of fall time of the supply voltage is determined as follows:
t
(t
supply voltage reaching 0.4 V
In the event a system does not satisfy the above condi-
tion, an external clamping diode (Dx) is needed to
protect the IC from rush current.
f
f
is the time between the supply voltage turn off and the
(V
CC
– 0.7) Cx / 20mA
CC
drops rapidly, there will be some possibil-
CC
drops slowly, the in rush current is
CC
)
CC
level in the wait
www.fairchildsemi.com