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HCF4538BM1 Datasheet(PDF) 2 Page - STMicroelectronics |
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HCF4538BM1 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 10 page HCF4538B 2/10 from either edge of an input pulse. An unused +TR input 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 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 of each new trigger pulse. For operation in the non-retiggerable 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 calculated by : T = RX CX. The min. value of external resistance, RX, is 4KΩ. The max. and min. values of external capacitance, CX, are 100 µF and 5nF, respectively. IINPUT EQUIVALENT CIRCUIT PIN DESCRIPTION Terminals 1, 8, 15 are electrically connected internally FUNCTIONAL DIAGRAM PIN No SYMBOL NAME AND FUNCTION 4, 12 +TR Trigger Inputs (Low to High, Edge-Triggered) 5, 11 -TR Trigger Inputs (High to Low, Edge-Triggered) 3, 13 RESET Direct Reset Inputs (Active Low) 1, 15 CX1, CX2 External Capacitor Con- nections 2, 14 RXCX1 RXCX2 External Resistor/Capaci- tor Connections 6, 10 Q1, Q2 Pulse Outputs 7, 9 Q1, Q2 Complementary Pulse Outputs 8 VSS Negative Supply Voltage 16 VDD Positive Supply Voltage |
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