Technical Data

3-Pin Microprocessor Reset Circuits

Data Sheet N1589 Rev. -

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SSR809N

SSR809P/SSR810P

Description:

SSR809P/SSR810P 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.

These devices perform as valid signals in applications with Vcc ranging from 6.0V down to 0.9V. The

reset signal lasts for a minimum period of 140ms whenever VCC supply voltage falls below preset

threshold. Both SSR809P and SSR810P 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

R E SET

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output and active-high RESET output, respectively.

Low supply current (1μA) makes SSR809P/SSR810P ideal for portable equipment. The devices are

available in SOT-23 package.

Features:

•

Ultra Low Supply Current 1μA(typ.)

•

Guaranteed Reset Valid to Vcc=0.9V

•

Available in Three Output Type: Open-Drain Active Low (SSR809N), Push-Pull Active Low

(SSR809P), Push-Pull Active High (SSR810P)

•

140ms Min. Power-On Reset Pulse Width

•

Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V, 4.2V, 4.4V, 4.6V

•

Tight Voltage Threshold Tolerance: 1.5%

•

Tiny Package in SOT-23

Applications:

•

Notebook Computers

•

Digital Still Cameras

•

PDAs

•

Critical Microprocessor Monitoring

Typical application circuit: