深圳市中立信电子科技有限公司

SP809EK-L-4-6/TR

监控电路 3 PIN MICROPROCESSOR RESET CIRCUIT 3 Pin Microprocessor Supervisor Circuit

GENERAL DESCRIPTION SP809EK-L-4-6/TR

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.

APPLICATIONS SP809EK-L-4-6/TR

• Portable Electronic Devices

• Electrical Power Meters

• Digital Still Cameras

• μP Power Monitoring

FEATURES SP809EK-L-4-6/TR

• 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