MC14538BCPG

Multivibrators Overview

The MC14538BCPG is a dual precision retriggerable and resettable monostable multivibrator from the 4000 series logic family, manufactured by onsemi. It operates within a supply voltage range of 3.0 Vdc to 18 Vdc and supports an operating temperature range of -55°C to +125°C. The device generates accurate output pulses with widths ranging from 10 μs to 10 s, determined by external timing components RX and CX using the formula T = RX • CX. It features latched trigger inputs allowing unlimited rise and fall times, and separate latched reset inputs. Propagation delay ranges from 100 ns to 600 ns depending on voltage, with quiescent current typically between 5 μA and 20 μA.

Multivibrators Feature Summary

• Dual precision monostable multivibrator architecture with independent timing networks for each channel
• Retriggerable and resettable functionality allowing pulse width extension or immediate termination
• Latched trigger inputs compatible with both positive-going (A input) and negative-going (B input) edges
• Capable of driving two low-power TTL loads or one low-power Schottky TTL load

Multivibrators Applications

• Timing generation circuits requiring precise pulse width control via external RC components
• Debouncing switches or contacts in digital logic systems
• Pulse stretching applications for signal synchronization
• Frequency division and waveform shaping in oscillator circuits

Multivibrators Procurement Notes

Verify that the ordering suffix 'CPG' corresponds to the PDIP-14 package as specified in distributor catalogs, while noting the primary datasheet emphasizes SOIC/TSSOP variants. Confirm RoHS compliance and Pb-Free status for environmental regulations. Ensure the supplier provides traceability documentation if automotive qualification (NLV prefix) is required, although standard MC14538B lacks this specific prefix. Validate pinout compatibility with existing PCB footprints before procurement.

Multivibrators Selection Notes

Select the MC14538BCPG when dual-channel monostable operation is required with wide pulse width flexibility. Choose this component over the MC14528B if retriggerable functionality is necessary, as the latter is non-retriggerable. Consider the MC54/74HC4538A only if operation below 10 μs pulse widths with supplies up to 6 V is needed. Ensure external timing components are selected to stay within the recommended resistance and capacitance limits to maintain accuracy across the full temperature range.

Multivibrators Part Context

The MC14538B belongs to the 4000 series CMOS logic family, known for high noise immunity and wide supply voltage operation. It is functionally similar to the CD4528B and MC14528B but offers enhanced retriggering capabilities. The device is designed for general-purpose timing applications where precision and reliability are critical. Its pin-for-pin compatibility with legacy designs facilitates easy upgrades in existing systems requiring improved timing stability.

Multivibrators Replacement Considerations

The MC14528B is a direct pin-compatible alternative but lacks retriggerable functionality. The CD4528B is also pin-compatible but may exhibit different electrical characteristics. For applications requiring sub-10 μs pulse widths, the MC54/74HC4538A is a suitable replacement, though it operates at lower voltages. Verify that any substitute maintains the required latched trigger and reset input configurations.