A5349

• Low average standby current
• Interconnect up to 125 detectors
• Piezoelectric horn driver
• Guard outputs for detector input
• Pulse testing for low supply
• Power-on reset (POR)
• Internal reverse battery protection
• Timer (Hush) mode for enabling reduced sensitivity period
• Built-in hysteresis reduces false triggering

The A5349 is a low-current, CMOS circuit providing all of the required features for an ionization-type smoke detector. A networking capability allows as many as 125 units to be interconnected so that if any unit senses smoke all units will sound their alarm. In addition, special features are incorporated to facilitate alignment and test of the finished smoke detector.

The internal oscillator and timing circuitry keep standby power to a minimum by powering down the device for 1.66 seconds and sensing for smoke for only 10 ms. Every 24 on-off cycles, a check is made for a low supply condition. By substituting other types of sensors or a switch for the ionization detector, this very-lowower device can be used in numerous other safety/security applications.

The A5349 is supplied in a low-cost 16-pin dual in-line plastic package (DIP). It is rated for continuous operation over the temperature range of -10°C to 60°C. The Pb (lead) free version (suffix ) has 100% matte tin leadframe plating.

Description

The A5349 is a low-current, CMOS circuit providing all of the required features for an ionization-type smoke detector. A networking capability allows as many as 125 units to be interconnected so that if any unit senses smoke all units will sound their alarm. In addition, special features are incorporated to facilitate alignment and test of the finished smoke detector.

The internal oscillator and timing circuitry keep standby power to a minimum by powering down the device for 1.66 seconds and sensing for smoke for only 10 ms. Every 24 on-off cycles, a check is made for a low supply condition. By substituting other types of sensors or a switch for the ionization detector, this very-low ower device can be used in numerous other safety/security applications.

The A5349 is supplied in a low-cost 16-pin dual in-line plastic package (DIP). It is rated for continuous operation over the temperature range of -10°C to 60°C. The Pb (lead) free version has 100% matte tin leadframe plating.