CD4098BE | Texas Instruments

Dual monostable multi-vibrator, CD4098BE, Texas Instruments

The CD4098BE dual 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 for the circuit. Adjustment of RX and CX provides a wide range of output pulse width from the Q and Q\ terminal. The time delay from trigger input to output transition (trigger propagation delay) and the time delay from set input to output transition (reset propagation delay) is independent of RX and CX.

Leading-edge-triggering (+TR) and trailing-edge-triggering (-TR) input is 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 pulse when power is turned on. An unused RESET input should be tied to VDD. However, if an entire section of the CD4098BE is not used, its RESET should be tied to 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-retriggerable 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.

Features

• Retriggerable/resettable capability
• Trigger and reset propagation delays independent of RX, CX
• Separate resets
• Wide range of output-pulse widths

Applications

• Pulse delay and timing
• Pulse shaping
• Astable multivibrator