器件名称: 74HC4538
功能描述: High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator
文件大小: 64.11KB 共11页
简 介:Data sheet acquired from Harris Semiconductor SCHS123
CD54HC4538, CD74HC4538, CD74HCT4538
High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator
Description
The Harris CD54HC4538, CD74HC4538 and CD74HCT4538 are dual retriggerable/resettable monostable precision multivibrators for xed 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 (τ) can be calculated from τ = (0.7) RX, CX; RMIN is 5k. CMIN is 0pF.
June 1998
Features
Retriggerable/Resettable Capability Trigger and Reset Propagation Delays Independent of RX, CX Triggering from the Leading or Trailing Edge Q and Q Bu……
