3-Pin Microprocessor
Reset Monitor
CYT809
(Preliminary)
Description
Features
The CYT809 is
a
cost-effective system
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Precision VCC Monitor for 2.8V, 3.0V, 3.3V, and
5.0V Supplies
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.
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140msec Guaranteed Minimum RESET Output
Duration
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RESET Output Guaranteed to VCC=1.0V
Low 18µA Supply Current
VCC Transient Immunity
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 CYT809 has an active-low RESET output. The
output of the CYT809 is guaranteed valid down to
VCC=1V. Both devices are available in a SOT-23
package.
Small SOT-23 Package
No External Components
Wide Operating Temperature: 0°C to 85°C
Application
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Computers
The CYT809 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.
Embedded systems
Battery powered equipment
Critical µP power supply monitoring
Application Diagram
Pin Configuration
Vcc
Vcc
Vcc
PROCESSOR
CYT809
RESET
INPUT
RESET
GND
GND
Preliminary and all contents are subject to change without prior notice.
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