MC14468P

Sensor And Detector Interfaces Overview

The MC14468P is a low-power CMOS ionization smoke detector IC designed for fire alarm systems complying with UL217 and UL268 specifications. It integrates an on-chip FET input comparator, piezoelectric horn driver, and internal reverse battery protection. The device operates within a supply voltage range of 6.0 V to 12 V, with a typical operating current of 5.0 µA at 9.0 V. It features an oscillator period of 1.67 seconds in standby and 40 ms during smoke detection. The IC supports interconnecting up to 40 units via the I/O pin for common signaling and includes power-on reset functionality to prevent false alarms.

Sensor And Detector Interfaces Feature Summary

• Ionization type detection with on-chip FET input comparator
• Piezoelectric horn driver for audible alarm output
• Active guard outputs on both sides of detect input to minimize leakage currents
• I/O pin allows connection of up to 40 units for common signaling

Sensor And Detector Interfaces Applications

• Smoke detector systems compliant with UL217 specifications
• Fire alarm systems compliant with UL268 specifications
• Multi-unit interconnected smoke detection networks

Sensor And Detector Interfaces Procurement Notes

Verify that the component matches the specific Freescale Semiconductor part number MC14468P. Confirm the package type is the 16-lead plastic DIP (Case 648-08). Ensure the temperature range meets the requirement of -10°C to +60°C. Check for any suffix codes indicating Pb-free packaging if required by environmental regulations.

Sensor And Detector Interfaces Selection Notes

Select this IC when designing ionization smoke detectors requiring UL217/UL268 compliance. Consider the low operating current for battery-powered applications. Evaluate the need for multi-unit interconnect capability, as the I/O pin supports up to 40 units. Verify external component compatibility, such as timing capacitors and resistors, to meet specific threshold requirements.

Sensor And Detector Interfaces Part Context

The MC14468 is a specialized integrated circuit developed by Freescale Semiconductor for safety-critical fire detection applications. It is part of a family of low-power CMOS devices designed to replace discrete component solutions in smoke detectors. The MC14468P variant specifically denotes the standard plastic DIP package version suitable for through-hole mounting in traditional alarm housing designs.

Sensor And Detector Interfaces Replacement Considerations

The MC14468ED is a Pb-free version of the same device with identical functionality. No other direct cross-model replacements are documented in the provided datasheet.