74HCT4538N,112

Multivibrators Overview

The NXP USA Inc. 74HCT4538N,112 is a dual retriggerable-resettable monostable multivibrator implemented in high-speed Si-gate CMOS technology. It operates within a supply voltage range of 2.0 V to 6.0 V and supports an ambient temperature range from -40 °C to +125 °C. The device features two independent multivibrators, each with separate reset inputs (nCD) and trigger/retrigger inputs (nA, nB). Output pulse width is determined by external timing components REXT and CEXT using the equation TW = 0.7 × REXT × CEXT. Propagation delays vary between 24 ns and 80 ns depending on supply voltage.

Multivibrators Feature Summary

• Dual precision monostable multivibrators with retriggerable functionality
• Triggering from both positive and negative input edges
• Schmitt-trigger action for tolerance to slow rise and fall times
• Separate direct reset inputs for immediate pulse termination

Multivibrators Applications

• Pulse generation and shaping circuits
• Timing delay applications
• Debouncing switches or contacts
• Frequency division circuits

Multivibrators Procurement Notes

Verify that the ordering suffix ',112' corresponds to the PDIP-16 package variant as specified in official Nexperia documentation. Confirm the specific revision level of the datasheet matches the production batch requirements. Ensure compatibility with standard DIP-16 footprint layouts during PCB design validation.

Multivibrators Selection Notes

Select this component when precise pulse width control is required over wide temperature variations. The HCT logic family ensures TTL-compatible input levels while maintaining CMOS low power dissipation. Verify that the external timing resistor and capacitor values selected align with the recommended operating conditions for the target supply voltage.

Multivibrators Part Context

This device belongs to the 74HC/HCT4538 series of dual retriggerable monostable multivibrators. It is pin compatible with the CD4528 and CD4538 devices from the 4000B series. The product complies with JEDEC standards JESD8C and JESD7A, ensuring broad interoperability within standard digital logic systems.

Multivibrators Replacement Considerations

The MM74HC4538 is documented as a pin-compatible alternative. Verify functional equivalence regarding trigger edge sensitivity and output characteristics before substitution.