CD74HC4538E Datasheet

Monostable Multivibrator


The CD74HC4538E 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-tooutput transition and the propagation delay from reset inputto-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 5kΩ. CMIN is 0pF CD74HC4538E Features • 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


[{"Name":"Propagation Delay Time:","Value":"250 ns, 50 ns, 43 ns"},{"Name":"High Level Output Current:","Value":"- 5.2 mA"},{"Name":"Low Level Output Current:","Value":"5.2 mA"},{"Name":"Supply Voltage - Max:","Value":"6 V"},{"Name":"Supply Voltage - Min:","Value":"2 V"},{"Name":" Maximum Power Dissipation:","Value":"136 mW"},{"Name":" Maximum Operating Temperature:","Value":"125 C"},{"Name":" Minimum Operating Temperature:","Value":"- 55 C"},{"Name":" Operating Supply Voltage:","Value":"2.5 V, 3.3 V, 5 V"},{"Name":"","Value":""}]

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