Preliminary and all contents are subject to change without prior notice.
1
CYT809
3-Pin Microprocessor
Reset Monitor
(Preliminary)
Description
The
CYT809 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 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.
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.
Features
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
Pin Configuration
Application
Computers
Embedded systems
Battery powered equipment
Critical µP power supply monitoring
Application Diagram
RESET
GND
Vcc
CYT809
RESET
GND
Vcc
PROCESSOR
INPUT
Vcc
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