Features: ` RETRIGGERABLE/RESETTABLE
` CAPABILITY TRIGGER AND RESET PROPAGATION DE. LAYS INDEPENDENT OF RX, CX TRIGGERING FROM LEADING OR TRAILING
` EDGE Q ANDQ BUFFERED OUTPUTS AVAILABLE .SEPARATE RESETS .WIDE RANGE OF OUTPUT-PULSE WIDTHS QUIESCENT CURRENT SPECIFIED TO 20V
` FOR HCC DEVICE .5V, 10V, AND 15V PARAMETRIC RATINGS SCHMITT TRIGGER INPUT ALLOWS UNLIMITER RISE ANDFALL TIMES ON+ TR AND
` TR INPUTS INPUT CURRENTOF 100nA AT 18V AND 25
` FOR HCC DEVICE .100% TESTEDFOR QUIESCENT CURRENT MEETSALLREQUIREMENTSOFJEDECTENTATIVESTANDARDN°
13A, "STANDARD SPECIFICATIONS FOR DESCRIPTION OF "B" SERIESCMOS DEVICES"
Pinout
Specifications
|
Symbol |
Parameter |
Value |
Unit |
|
VDD * |
Supply Voltage: HCC Types
HCF Types |
-0.5 to +20
-0.5 to +18 |
V
V |
|
Vi |
Input Voltage |
-0.5 to VDD + 0.5 |
V |
|
II |
DC Input Current (any one input) |
± 10 |
mA |
|
Ptot |
Total Power Dissipation (per package)
Dissipation per Output Transistor
for Top = Full Package Temperature Range |
200
100 |
mW
mW |
|
Top |
Operating Temperature: HCC Types
HCF Types |
-55 to +125
-40 to +85 |
|
|
Tstg |
Storage Temperature |
-65 to +150 |
|
Stressesabove those listedunder "Absolute Maximum Ratings"may cause permanent damage to thedevice. This isa stress ratingonly and functional operation of the device at these or any other conditions above those indicated in theoperational sections of this specification is not implied. Exposure to absolute maximum rating conditions for xternal periods may affect device reliability.
* All voltage values are referred to VSS pin voltage.
DescriptionThe HCC4538B (extended temperature range) and HCF4538B (intermediate temperature range) are monolithic integrated circuit, available in 16-lead dual in-line plastic or-ceramic package and plastic micropackage. The HCC4538B dual precision monostable multivibrator provides stable retriggerable/resettable one-shot operation for any fixedvoltage timing application. An external resistor (RX) and an external capacitor (CX) control the timing and accuracy for the circuit. Adjustment of RX and CX provides a wide range of output pulse widths from the Q and Q terminals. The time delay from trigger input to output transition (trigger propagation delay) and the time delay from reset input to output transition (reset propagation delay) are independent ofRX and CX. Precision control of output pulse widths is achieved through linear CMOS techniques. Leading-edge-triggering (+TR) and trailing-edge-triggering ( TR) inputs are provided for triggering from either edge of an input pulse. An unused + TRinput should be tied to VSS. An unused TR input should be tied to VDD. A RESET (on low level) is provided for immediate termination of the output pulse or to prevent output pulses when power is turned on. An unused RESET input should be tied to VDD. However, if an entire section of the HCC/HCF4538B is not used, its inputs must be tied to either VDD or VSS (see table 1). In normal operation the circuit triggers (extends the output pulse one period) on the application ofeach new trigger pulse. Foroperation 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 HCC4538B multivibrator can be calculated by : T = RX CX. The min. value of external resistance, RX, is4KW. The max. and min.
values of external capacitance, CX, are 100mF and 5nF, respectively.
HCC4538B Data Sheet
