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| CAT808 Datasheet, PDF (3/7 Pages) Catalyst Semiconductor – Low-Power Precision Voltage Detector | |||
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OPERATION â 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, ¯O¯U¯T¯ is
held active low until the supply voltage (VDD) rises
above VDET. While VDD is above VDET, ¯O¯U¯T¯ stays high
until VDD drops below VDET, then ¯O¯U¯T¯ once again
goes low.
BLOCK DIAGRAM
VDD
VOLTAGE
REFERENCE
TIMING DIAGRAM
GND
VDET(MAX)
VDET
VDET(MIN)
TPLH
VDD*
VOH
VDET(MAX)
VDET
VDET(MIN)
TPHL
OUT
OUT Slews with VDD
* Voltage of VDD below 1 volt will not be able to maintain low output.
PIN FUNCTIONS
Pin
VDD
GND
¯O¯U¯T¯
NC
Function
Voltage Input and Power Supply
Ground Pin
Active Low Open Drain output
No Connect, the pin is electrically open
CAT808
OUT
© 2010 SCILLC. All rights reserved.
3
Characteristics subject to change without notice
Doc. No. MD-3024 Rev. F
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