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CM3107

2 Amp Source/ Sink Bus Termination Regulator for DDR Memory and Front Side Bus Applications

California Micro Devices Corp 

CM3107

2 Amp Source/ Sink Bus Termination Regulator

for DDR Memory and Front Side Bus Applications

Features

• Ideal for Intel 865 Front Side Bus VTT and DDR

VTT applications

• Sinks and sources 2 Amps

• Over current protection

• Over temperature protection

• Integrated power MOSFETs

• Excellent accuracy (0.5% load regulation)

• Selectable output (1.225V/1.45V or VDDQ/2)

• 8-lead SOIC and PSOP packages

• Lead-free versions available

Applications

• Intel 865/845 Front Side Bus termination

• Single and dual DDR memory termination

• Active termination buses

• Graphics card DDR memory termination

Product Description

The CM3107 is a sinking and sourcing regulator specif-

ically designed for series-parallel bus termination for

high-speed chip set busses as well as DDR memory

systems. It can source and sink current up to 2.0A with

a load regulation of 0.5%. The VTT output voltage is

selectable by VDDQSEL and FSBSEL pins. The

VDDQSEL pin controls whether the CM3107 is in DDR

memory mode with VTT=VDDQ/2, or in FSB mode. In

FSB mode, FSBSEL controls whether VTT is 1.225V or

1.45V. This allows the same chip to be used in two dif-

ferent circuits on an Intel 865-based motherboard.

The CM3107 provides over current and over tempera-

ture protection, which protect the chip from excessive

heating due to high current and high temperature. A

shutdown capability using an external transistor

reduces power consumption and provides a high

impedance output.

The CM3107 is housed in 8-lead SOIC and PSOP

packages and is available with optional lead-free finish-

ing.

Simplified Electrical Schematic

VCC

VDDQSEL FSBSEL

VDDQ

Over Temp

Over Current

Reference

VREF

OUT IN

Buffer

Output

Select

Driver

VTT

VSENSE

GND

© 2004 California Micro Devices Corp. All rights reserved.

02/02/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214 L Fax: 408.263.7846 L www.calmicro.com

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