CD74HCT221 - 具有复位功能的高速 CMOS 逻辑双路单稳多频振荡器

CD74HCT221是TI德州仪器公司的一款单稳多频振荡器产品，CD74HCT221是具有复位功能的高速 CMOS 逻辑双路单稳多频振荡器，本站介绍了CD74HCT221的封装应用图解、特点和优点、功能等，并给出了与CD74HCT221相关的TI元器件型号供参考。

CD74HCT221 - 具有复位功能的高速 CMOS 逻辑双路单稳多频振荡器 - 单稳多频振荡器 - 特殊逻辑 - 德州仪器

产品描述

The ’HC221 and CD74HCT221 are dual monostable multivibrators with reset. 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. Pulse triggering on the B input occurs at a particular voltage level and is not related to the rise and fall time of the trigger pulse.

Once triggered, the outputs are independent of further trigger inputs on A\ and B. The output pulse can be terminated by a LOW level on the Reset (R)\ pin. Trailing Edge triggering (A)\ and leading-edge-triggering (B) inputs are provided for triggering from either edge of the input pulse. On power up, the IC is reset. If either Mono is not used each input (on the unused device) must be terminated either high or low.

The minimum value of external resistance, RX, is typically 500. The minimum value of external capacitance, CX, is 0pF. The calculation for the pulse width is tW = 0.7 RXCX at VCC = 4.5V.

产品特性

Overriding RESET Terminates Output Pulse
Triggering from the Leading or Trailing Edge
Q and Q\ Buffered Outputs
Separate Resets
Wide Range of Output-Pulse Widths
Schmitt Trigger on B Inputs
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

Data sheet acquired from Harris Semiconductor

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