LMC6953
www.ti.com SNVS132D – APRIL 1998 – REVISED APRIL 2013 LMC6953 PCI Local Bus Power Supervisor
Check for Samples: LMC6953 FEATURES DESCRIPTION The LMC6953 is a voltage supervisory chip designed
to meet PCI (Peripheral Component Interconnect)
Specifications Revision 2.1. It monitors 5V and 3.3V
power supplies. In cases of power-up, power-down,
brown-out, power failure and manual reset interrupt,
the LMC6953 provides an active low reset. RESET
holds low for 100 ms after both 5V and 3.3V powers
recover, or after manual reset signal returns to high
state. The external capacitor on pin 8 adjusts the
reset delay. 1 2 Compliant to PCI Specifications Revision 2.1.
Under and Over Voltage Detectors for 5V and
3.3V
Power Failure Detection (5V Falling Under 3.3V
by 300 mV Max)
Manual Reset Input Pin
Specified RESET Assertion at VDD = 1.5V
Integrated Reset Delay Circuitry
Open Drain Output
Adjustable Reset Delay
Response Time for Over and Under Voltage
Detection: 490 ns Max …
