The HCF4538B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages.
The HCF4538B dual precision monostable multivibrator provides stable retriggerable/resettable one-shot operation for any fixed voltage 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) and the time delay from reset input to output transition (reset propagation delay) are independent of RX and CX. Precision control of output pulse width 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 +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 mF and 5nF, respectively.
| 订购型号 | 产品状态 | 美金价格 | 数量 | 封装 | 包装形式 | 温度范围 | 材料声明 |
| HCF4538BEY | Active | 1000 | PDIP 16 | Tube | HCF4538BEY | ||
| HCF4538M013TR | Active | 1000 | SO-16 | Tape And Reel | HCF4538M013TR |
| 描述 | 版本 | 大小 |
| HCF4538 : DS0388: DUAL MONOSTABLE MULTIVIBRATOR | 1 | 305KB |
