SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
FEATURES
■ Ultra Low Supply Current 1µA (typ.)
■ Guaranteed Reset valid to VCC = 0.9V
■ 140 ms Min. Power-On Reset Pulse Width
■ Internally Fixed Threshold 2.3V, 2.6V, 2.9V,
3.1V, 4.0V, 4.4V, 4.6V
■ Tight Voltage Threshold Tolerance: 1.5%
■ Offered in a 3 Pin SOT-23 Package
VCC
SP809
3 Pin SOT-23
GND
RESET
Now Available in Lead Free Packaging
Part Number
SP809N
SP809
SP810
Output Type
Open-Drain Active Low
Push-Pull Active Low
Push-Pull Active High
APPLICATIONS
■ Portable Electronic Devices
■ Electrical Power Meter
■ Digital Still Camera
■ µP Power Monitoring
DESCRIPTION
The SP809/SP810 are low power microprocessor (µP) supervisory circuits used to monitor
power supplies in µP and digital systems. They provide applications with benefits of circuit
reliability and low cost by eliminating external components. If the VCC supply voltage falls below
preset threshold then a reset signal is asserted for at least 140ms after VCC has risen above the
reset threshold. Both the SP809 and SP810 were designed with a reset comparator to help
identify invalid signals, which last less than 140ms. The only difference between them is that they
have an active-low RESET output and active-high RESET output, respectively. Low supply
current (1µA) makes SP809/SP810 ideal for portable equipment. The devices are available in
3 pin SOT-23 package.
TYPICAL APPLICATION CIRCUIT
VCC
VCC
RESET
(RESET)
VCC
µP
RESET
GND
GND
Push-Pull output
Date: 5/02/06 Rev B
SP809/810, 3 Pin Microprocessor Supervisor Circuit
1
© Copyright 2006 Sipex Corporation