Features 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 Guaranteed 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 Power failure response time: 90 ns Max Requires minimal external components 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. This part is ideal on PCI motherboards or add-in cards to ensure the integrity of the entire system when there is a fault condition. The active low reset sets the microprocessor or local device in a known state. The LMC6953 has a built-in bandgap reference that accurately determines all the threshold voltages. The internal reset delay circuitry eliminates additional discrete components. Applications Desktop PCs PCI-Based Systems Network servers

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LMC6953 PCI Local Bus Power Supervisor	660 Kbytes	3-Mar-05	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1077: Application Note 1077 Understanding The Analog Requirements of PCI Bus Standard-How to Protect The Digital Components	74 Kbytes	1-May-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMC6953CM/NOPB LMC6953CM RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 760 AVNET-EM Worldwide 214 DIGI-KEY Worldwide 0 MOUSER Worldwide 282 TAYLOR Americas 760	$1.44 each at 1K+ pcs	rail of 95
LMC6953CMX/NOPB LMC6953CMX RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2500 DIGI-KEY Worldwide 0 MOUSER Worldwide 2500 TAYLOR Americas 2500	$1.44 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMC6953.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMC6953 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMC6953CM/NOPB LMC6953CM	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	spice file	NSZXTT LMC69 53CM
LMC6953CMX/NOPB LMC6953CMX	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	N/A	spice file	NSZXTT LMC69 53CM

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMC6953.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMC6953 is located at RoHS Status.

CAD Symbols and Models N/A

Models spice file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMC6953CM	CS100	1	14211	71	0	898000	4	254809951
LMC6953CMX	CS100	1	14211	71	0	898000	4	254809951

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMC6953.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMC6953 is located at RoHS Status.