CM3202 Ver la hoja de datos (PDF) - California Micro Devices Corp

Número de pieza

componentes Descripción

Fabricante

CM3202

DDR VDDQ and Termination Voltage Regulator

California Micro Devices Corp 

PRELIMINARY

CM3202

Pin Description

Pin Descriptions

PIN(S)

TDFN 8

1

2, 4

3

5, 6

7

8

PIN(S)

SOIC 8

1, 2

3

4, 5

6

7, 8

PIN DESCRIPTIONS

NAME DESCRIPTION

VIN

NC

VTT

GND

Input voltage pin, typically 3.3V from the silver box.

VTT regulator output voltage pin, which is preset to 50% of VDDQ.

Ground pin. The back tab is also ground and serves as the package

heatsink. It should be soldered to the circuit board copper to remove

excess heat from the IC.

This pin is for VDDQ output voltage Adjustment. The VDDQ output voltage is

set using an external resistor divider connected to ADJSD. The output

voltage is determined by the following formula

VDDQ

=

1.25V × R-----1----+-----R-----2-

R1

ADJSD

VDDQ

where R1 is the ground-side resistor and R2 is the upper resistor of the

divider. Connect these resistors to the VDDQ output at the point of

regulation.

In addition, functions as a Shutdown pin. Apply a voltage higher than VIN-

0.6V to this pin to simultaneously shutdown both VDDQ and VTT outputs.

The outputs are restored when the voltage is lowered below VIN-0.6V. A

low-leakage diode in series with the Shutdown signal is recommended to

avoid interference with the voltage adjustment setting.

VDDQ regulator output voltage pin.

© 2006 California Micro Devices Corp. All rights reserved.

6 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

05/08/06

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