MP55C datasheet(2/3 Pages) SEMTECH

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MP55C

PENTIUM

PROCESSOR P55C

VOLTAGE REGULATOR MODULE

October 27, 1997

652 MITCHELL ROAD NEWBURY PARK CA 91320

VOLTAGE REGULATOR MODULE CONNECTOR PIN REFERENCE

Pin Name

I/O

Function

Notes

+3.3V

Input

+3.3V Supply

Connected directly to V

I/O.

MP55C-3.3: Main Power Input

+5.0V

Input

+5.0V Supply

MP55C-5: Main power input

MP55C-3.3: Bias for regulator control

CORE

Output

Voltage Regulator Module Output

2.8V output for CPU core

I/O

Output

CPU I/O power connection.

Tied to 3.3V input (V

CC3)

Input

Ground Reference

Ground

DISABLE

Input

When driven high, this input will disable the

Voltage Regulator Module output and the

output of the module will float.

Not connected

PWR GOOD

Output

Power Good is driven low when the VRM

output is not within valid levels.

Not connected

SENSE

Input

Sense is provided for the regulator to correct

for voltage drops across the connector and

motherboard powerplane.

MP55C-5: Not connected

MP55C-3.3: Connected

RES

Input

Formerly UPVRM#

Tied to output.

Not connected

INPUT AND OUTPUT CONNECTIONS

Pin No.

Row A

Row B

Pin No.

I/O

+3.3V

CORE

PWR GOOD

RES

SENSE

DISABLE

+5.0V

VRM

PCB

End view of VRM connector

(viewed from motherboard side)

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