Features
• High-Voltage Type (20V Rating)
• Retriggerable/Resettable Capability
• Trigger and Reset Propagation Delays Independent of
RX, CX
• Triggering From Leading or Trailing Edge
• Q and Q Buffered Outputs Available
• Separate Resets
• Wide Range of Output-Pulse Widths
• Schmitt-Trigger Input Allows Unlimited Rise and Fall
Times On +TR and -TR Inputs
• 100% Tested For Maximum Quiescent Current at 20V
• Maximum Input Current of 1A at 18V Over Full Package-Temperature Range:
- 100nA at 18V and +25oC
• Noise Margin (Full Package-Temperature Range):
- 1V at VDD = 5V
- 2V at VDD = 10V
- 2.5V at VDD = 15V
• 5V, 10V and 15V Parametric Ratings
• Standardized Symmetrical Output Characteristics
• Meets All Requirements of JEDEC Tentative Standards
No. 13B, “Standard Specifications for Description of “B”
Series CMOS Device’s

Description
CD14538BMS dual precision 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 and accuracy for the circuit. Adjustment of RX and CX provides a
wide range of output pulse widths from the Q and Q terminals. The
time delay from trigger input to output transition (trigger propagation
delay) and the time delay from reset input to output transition (reset
propagation delay) are independent of RX and CX. Precision control of
output pulse widths is achieved through linear CMOS techniques.
Leading-edge-triggering (+TR) and trailing-edge-triggering (-TR) inputs
are 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 pulses when power is
turned on. An unused RESET input should be tied to VDD. However, if
an entire section of the CD14538BMS is not used, its inputs must be
tied to either VDD or VSS. See Table 1.
In normal operation the circuit retriggers (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. The time period (T) for this multivibrator can be
calculated by: T = RXCX.
The minimum value of external resistance, RX is 4K. The minimum
and maximum values of external capacitance, CX, are 0pF and 100F,
respectively.
The CD14538BMS is interchangeable with type MC14538 and is similar to and pin-compatible with the CD4098B* and CD4538B**.
* T = 0.5 RXCX for CX  1000pF.
* T = RXCX; CX min = 5000pF