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CM312102SB Datasheet(PDF) 9 Page - California Micro Devices Corp

Part # CM312102SB
Description  Dual Linear Voltage Regulator for DDR-I and DDR-II Memory
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Manufacturer  CALMIRCO [California Micro Devices Corp]
Direct Link  http://www.calmicro.com
Logo CALMIRCO - California Micro Devices Corp

CM312102SB Datasheet(HTML) 9 Page - California Micro Devices Corp

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© 2004 California Micro Devices Corp. All rights reserved.
11/12/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.calmicro.com
9
CM3121
PRELIMINARY
Application Information
Other Applications
The CM3121 can be used without any external resis-
tors if a VDDQ voltage of 2.5V is required by connecting
the SENSE_VDDQ pin to GND.
Also in applications where a reference voltage (VREF)
is required, a PCB trace directly from the VTT pin can
be used. The VTT output pin has an error relative to
VDDQ/2 of up to +/-25mV, which is well within most
DDR system specs of +/-50mV. This is because the
VTT output internally tracks the VDDQ output very
closely due to the matched on-chip resistors R that tap
down from the VDDQ rail, and the low offset voltage of
the VTT regulator. It is recommended that the VREF
trace be connected directly to the VTT pin, to eliminate
noise and ripple on the VTT line caused by current
switching
.
Figure 4. Typical Application for the CM3121
VREF=1.25V
VREF
R
R
FAULT
VTT=1.25V
VDDQ
REGULATOR
VTT
REGULATOR
EN_DDR
VCC
GND
CDDQ
DDR
MEMORY
CPU
CORE
+ I/O
CCC
CTT
Enable DDR
Memory #
2.8V to 3.6V
SENSE VTT
VTT
SENSE VTT
VDDQ
SENSE
VDDQ
CURRENT LIMIT
OVERTEMP
LOW INPUT


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