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CAT808

OPERATION – VOLTAGE DETECTOR

The CAT808 has an active low output that asserts

(pulls low) when the supply voltage drops below the

detection threshold voltage (VDET). The open-drain

output requires an external pull-up resistor between

the output pin and the supply voltage (as shown in the

typical application diagram). On power-up, OUT

¯¯¯¯ is

held active low until the supply voltage (VDD) rises

above VDET. While VDD is above VDET, OUT

¯¯¯¯ stays high

until VDD drops below VDET, then OUT

¯¯¯¯ once again

goes low.

BLOCK DIAGRAM

VOLTAGE

REFERENCE

OUT

VDD

TIMING DIAGRAM

TPLH

TPHL

VDET(MIN)

VDET(MAX)

VDET

VDET(MAX)

VDET

OUT Slews with VDD

GND

VOH

VDD*

OUT

* Voltage of VDD below 1 volt will not be able to maintain low output.

PIN FUNCTIONS

Function

VDD

Voltage Input and Power Supply

GND

Ground Pin

OUT

¯¯¯¯

Active Low Open Drain output

No Connect, the pin is electrically open

Doc. No. MD-3024 Rev. F

Characteristics subject to change without notice

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