SP810 Datasheet Text
February 2011
SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
Rev. 2.0.0
GENERAL 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 ponents. 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 parator 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.
APPLICATIONS
- Portable Electronic Devices
- Electrical Power Meters
- Digital Still Cameras
- µP Power Monitoring
Features
- Ultra Low Supply Current 1µA (typ)
- Guaranteed Reset valid to VCC = 0.9V
- 140ms Power-On Reset Pulse Width
- Internally Fixed Threshold
2.3V, 2.6V, 2.9V, 3.1V, 4.4V, 4.6V
- 1.5% Voltage Threshold Tolerance
- 3 Pin SOT-23 Package
Part Number
SP809N SP809 SP810
Output Type
Open Drain Active Low Push-Pull Low
Push-Pull Active High
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP809 / SP810 Application Diagram
Exar Corporation 48720 Kato Road, Fremont CA 94538, USA...
