CD74HC4538 - 高速 CMOS 逻辑双路可重触发精密单稳多频振荡器

CD74HC4538是TI德州仪器公司的一款单稳多频振荡器产品，CD74HC4538是高速 CMOS 逻辑双路可重触发精密单稳多频振荡器，本站介绍了CD74HC4538的封装应用图解、特点和优点、功能等，并给出了与CD74HC4538相关的TI元器件型号供参考。

CD74HC4538 - 高速 CMOS 逻辑双路可重触发精密单稳多频振荡器 - 单稳多频振荡器 - 特殊逻辑 - 德州仪器

产品描述

The ’HC4538 and ’HCT4538 are dual retriggerable/resettable monostable precision multivibrators for fixed voltage timing applications. An external resistor (RX) and an external capacitor (CX) control the timing and the accuracy for the circuit. Adjustment of RX and CX provides a wide range of output pulse widths from the Q and Q\ terminals. The propagation delay from trigger input-to-output transition and the propagation delay from reset input-to-output transition are independent of RX and CX.

Leading-edge triggering (A) and trailing edge triggering (B)\ inputs are provided for triggering from either edge of the input pulse. An unused "A" input should be tied to GND and an unused B\ should be tied to VCC. On power up the IC is reset. Unused resets and sections must be terminated. In normal operation the circuit retriggers on the application of each new trigger pulse. To operate in the non-triggerable mode Q\ is connected to B\ when leading edge triggering (A) is used or Q is connected to A when trailing edge triggering (B)\ is used. The period (. CMIN is 0pF.

产品特性

Retriggerable/Resettable Capability
Trigger and Reset Propagation Delays Independent of RX, CX
Triggering from the Leading or Trailing Edge
Q and Q\ Buffered Outputs Available
Separate Resets
Wide Range of Output Pulse Widths
Schmitt Trigger Input on A and B\ Inputs
Retrigger Time is Independent of CX
Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
Wide Operating Temperature Range . . . –55°C to 125°C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il 1µA at VOL, VOH

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