HCC4098BF_1189033

The HCC/HCF4098B are monolithic integrated circuit, available in 16-lead dual in-line dual in-line plastic or ceramic package and plastic micropackage. The HCC/HCF4098B dualmonostable multivibrator provides stable retrig- gerable/resettable one-shot operation for any fixed- voltage timing application. An external resistor (RX) and an external capacitor (CX) control the timing for the circuit.Adjustment of RX and CX provides a wide range of output pulse widths from the Q and Q ter- minals. The time delay from trigger input to output transition (trigger propagation delay) and the time delay from reset input to output transition (reset pro-pagation delay) are independent of RX and C_X. Leading-edge-triggering (+ TR) and trailing-edge- triggering ( TR) inputs are provided for triggering from either edge of an input pulse. An unused + TR input should be tied to V_SS. An unused TR input should be tied to V_DD. ARESET (on lowlevel) is pro-vided for immediate termination of the output pulse or to prevent output pulses when power is turned on. An unusedRESET input should be tied toVDD. How- ever, if an entire section of the 4098B is not used, its RESET should be tied to V_SS. See table I. In nor- mal operation the circuit triggers (extends the output pulse one period) on the application of each new trigger pulse. For operation in the non-triggerable mode, Q is connected to TR when leading-edge triggering (+ TR) is used or Q is connected to + TR when trailing-edge triggering ( TR) is used.The time period (T) for this multivibrator can be approximated by T_X = 1/2 R_X C_X forC_X 0.01 µF. Time periods as a function of RX for values of C_X and V_DD are given in fig. 8. Values of T vary fromunit to unit and as a func- tionofvoltage, temperature, andR_X C_X. Theminimum value of external resistance, R_X,is5kΩ. The maxi- mum value of external capacitance, C_X, is 100µF. Fig.9 shows timeperiods asafunctionofC_X forvalues of RX and V_DD. The output pulse width has vari-ations of ±  2.5%typically, over the temperature range of 55°C to 125° CforC_X = 1000pF and R_X = 100 kΩ. For power supply variations of ±  5%, the output pulsewidth has variations of   ± 0.5%typically, for V_DD = 10V and 15V and ± 1% typically, for V_DD =5Vat C_X = 1000 pF and R_X =5kΩ.