CD4538BCWM

Multivibrators Overview

The CD4538BCWM is a dual precision monostable multivibrator manufactured by Fairchild Semiconductor, housed in a 16-lead Small Outline Integrated Circuit (SOIC) package with JEDEC MS-013 wide body dimensions. It operates on a wide supply voltage range of 3.0V to 15V DC and features independent trigger and reset controls with internally latched inputs. The device supports both rising and falling edge triggering via separate A and B inputs, while active LOW clear inputs inhibit triggering when asserted. Pulse width is determined by external components RX and CX using the formula PWOUT = RC.

Multivibrators Feature Summary

• Dual precision monostable multivibrators with retriggerable and resettable functionality
• Separate latched reset inputs that prevent triggering while active
• Symmetrical output sink and source capability for versatile interfacing
• High noise immunity with low standby current consumption

Multivibrators Applications

• Pulse generation and timing circuits
• Debouncing switches and contacts
• Frequency division and pulse stretching

Multivibrators Procurement Notes

Verify the specific ordering code suffix against manufacturer documentation to confirm package type and tape/reel availability. Ensure the component meets required operating temperature ranges and electrical specifications for the intended application environment before procurement.

Multivibrators Selection Notes

Select this component for applications requiring precise pulse width control with linear CMOS techniques. Consider the wide supply voltage range and TTL compatibility when designing interfaces. Verify external timing component leakage characteristics as they influence maximum usable resistance values.

Multivibrators Part Context

This device belongs to the CD4538 family of dual precision monostables. It is pin compatible with the CD4528BC. The SOIC-16 wide body package facilitates surface mount assembly while maintaining standard pinout configurations for easy integration into existing designs.

Multivibrators Replacement Considerations

CD4538BCM

Multivibrators FAQ

How does the device handle retriggering during an active pulse?

The CD4538BC is retriggerable; if a valid trigger occurs before the Q output returns to its quiescent state, the output pulse width extends from the time of the last valid trigger.

Is an external protection resistor required for the timing pin?

No external protection resistor is required in series with the timing pin because the device does not allow the timing capacitor to discharge through the timing pin during power-down conditions.