HCC4538B Datasheet, PDF (2/14 Pages) STMicroelectronics – DUAL MONOSTABLE MULTIVIBRATOR

HCC/HCF4538B
prevent output pulses when power is turned on. An
unused RESET input should be tied to VDD. How-
ever, if an entire section of the HCC/HCF4538B is
not used, its inputs must be tied to either V_DD or V_SS
(see table 1). In normal operation the circuit triggers
(extends the output pulse one period) on the appli-
cation of each new trigger pulse. For operation in the
non-retriggerable mode, Q is connected to – TR
when leading-edge triggering (+ TR) is used or Q is
connected to + TR when trailingedge triggering (–
TR) is used. The time period (T) for this multivibrator
can be calculated by : T = R_X C_X. The min. value of
external resistance, RX, is 4KΩ. The max. and min.
values of external capacitance, CX, are 100µF and
5nF, respectively.
FUNCTIONAL DIAGRAM
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
Unit
V_DD *
Supply Voltage: HCC Types
HCF Types
-0.5 to +20
V
-0.5 to +18
V
V_i
Input Voltage
-0.5 to V_DD + 0.5
V
II
DC Input Current (any one input)
± 10
mA
Ptot Total Power Dissipation (per package)
200
mW
Dissipation per Output Transistor
for Top = Full Package Temperature Range
100
mW
Top Operating Temperature: HCC Types
HCF Types
-55 to +125
o_C
-40 to +85
o_C
T_stg Storage Temperature
-65 to +150
o_C
Stresses above those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress ratingonly and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure
to absolute maximum rating conditions for external periods may affect device reliability.
* All voltage values are referred to VSS pin voltage.
RECOMMENDED OPERATING CONDITIONS
Symbol
V_DD
V_I
Top
Parameter
Supply Voltage: HCC Types
HCF Types
Input Voltage
Operating Temperature: HCC Types
HCF Types
Value
Unit
3 to 18
V
3 to 15
V
0 to V_DD
V
-55 to +125
o_C
-40 to +85
o_C
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