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CM3196

2A Sink/Source DDR-I, -II Bus Termination Regulator

California Micro Devices Corp 

CM3196

2A Sink/Source DDR-I, -II Bus Termination Regulator

Features

• Ideal for DDR-I, -II VTT applications

• Sinks and sources 2A for DDR-I, 0.6A for DDR-II

• Shutdown input to support ACPI states

• Operates down to 1.5V input voltage

• Integrated power MOSFETs

• Overcurrent protection

• Over temperature protection

• Excellent accuracy

VTT = VREF ± 30mV

VTT = VDDQ/2 ± 2%

• 8-pin SOIC or PSOP package

• Lead-free versions available

Applications

• DDR-I, -II memory termination

• Active termination buses

• Graphics card memory termination

Product Description

The CM3196 is a sinking and sourcing regulator specif-

ically designed for DDR-I, -II VTT bus termination. The

output voltage accurately tracks VDDQ/2. For DDR-I it

can source and sink current up to 2A with a load regu-

lation of 0.5%. This current adequately serves both sin-

gle and dual channel DDR-I memory systems. For

power conscious notebook applications, the CM3196

also operates from a VDDQ of 1.5V or 1.8V with less

current drive. For DDR-II applications, the CM3196

provides up to 0.6A at 0.9V to drive the memory con-

troller VTT.

For boards which support Suspend to RAM (STR)

functionality, the CM3196 provides a Shutdown (SD)

pin. When SD is set low, VTT will be in tri-state mode,

causing the output to go high impedance. In this mode,

CM3196 power is saved by significantly reducing the

quiescent current. VREF voltage remains VDDQ/2.

The CM3196 provides overcurrent and over tempera-

ture protection. These features protect the chip from

excessive heating due to high current and high temper-

ature.

The CM3196 is housed in an 8-pin SOIC or PSOP

package and is available with optional lead-free finish-

ing.

Simplified Electrical Schematic

AVIN

VDDQ

PVIN

Over Temp

SD

Over Current

Reference

VREF

OUT IN

Buffer

Driver

VTT

VSENSE

GND

© 2004 California Micro Devices Corp. All rights reserved.

04/22/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com

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