SE809

3-Pin Microprocessor Reset Monitor (Preliminary) Description The SE809 is a cost-effective system supervisor Integrated Circuit (IC) designed to monitor VCC in digital and mixed signal systems and provide a warning signal when the system power supply is out of working range, and a reset signal to the host processor when necessary. No external components are required. The reset output is driven active within 20μsec of VCC falling through the reset voltage threshold. Reset is maintained active for a minimum of 140msec after VCC rises above the reset threshold. The SE809 has an active-low RESET output. The output of the SE809 is guaranteed valid down to VCC=1V. Both devices are available in a SOT-23 package. ¾ The SE809 is optimized to reject fast transient glitches on the VCC line. Low supply current of 18μA (VCC=3.3V) makes these devices suitable for battery powered applications. ¾ ¾ ¾ Computers Embedded systems Battery powered equipment ¾ ¾ ¾ ¾ ¾ ¾ ¾ SE809 Features ¾ Precision VCC Monitor for 2.8V, 3.0V, 3.3V, and 5.0V Supplies 140msec Guaranteed Minimum RESET Output Duration RESET Output Guaranteed to VCC=1.0V Low 18μA Supply Current VCC Transient Immunity Small SOT-23 Package No External Components Wide Operating Temperature: 0°C to 85°C Application Critical µP power supply monitoring Pin Configuration Application Diagram Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2005. www.seawardinc.com 1 3-Pin Microproc...