CM3196 Datasheet, PDF (1/13 Pages) California Micro Devices Corp – 2A Sink/Source DDR-I, -II Bus Termination Regulator

CM3196
2A Sink/Source DDR-I, -II Bus Termination Regulator
Features
• Ideal for DDR-I, -II V_TT 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
V_TT = V_REF ± 30mV
V_TT = V_DDQ/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 V_TT bus termination. The
output voltage accurately tracks V_DDQ/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 V_DDQ 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 V_TT.
For boards which support Suspend to RAM (STR)
functionality, the CM3196 provides a Shutdown (SD)
pin. When SD is set low, V_TT 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. V_REF voltage remains V_DDQ/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
AV_IN
V_DDQ
PV_IN
Over Temp
SD
Over Current
Reference
V_REF
OUT IN
Buffer
Driver
V_TT
V_SENSE
GND
© 2004 California Micro Devices Corp. All rights reserved.
04/22/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: [phone] ▲ Fax: [phone] ▲ www.calmicro.com
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