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LMC6953CM Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMC6953CM Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 12 page  LMC6953 PCI Local Bus Power Supervisor General Description The LMC6953 is a voltage supervisory chip designed to meet PCI (Peripheral Component Interconnect) Specifica- tions 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. This part is ideal on PCI motherboards or add-in cards to en- sure the integrity of the entire system when there is a fault condition. The active low reset sets the microprocessor or lo- cal device in a known state. The LMC6953 has a built-in bandgap reference that accu- rately determines all the threshold voltages. The internal re- set delay circuitry eliminates additional discrete components. Features n Compliant to PCI specifications revision 2.1. n Under and over voltage detectors for 5V and 3.3V n Power failure detection (5V falling under 3.3V by 300 mV max) n Manual reset input pin n Guaranteed RESET assertion at V DD = 1.5V n Integrated reset delay circuitry n Open drain output n Adjustable reset delay n Response time for over and under voltage detection: 490 ns Max n Power failure response time: 90 ns Max n Requires minimal external components Applications n Desktop PCs n PCI-Based Systems n Network servers Typical Application Circuits On Mother Board DS012846-23 On Add-in Cards DS012846-24 April 1998 © 1998 National Semiconductor Corporation DS012846 www.national.com |
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