CM3109-00SH CALMIRCO [California Micro Devices Corp], CM3109-00SH Datasheet - Page 11

• Manufacturer Part Number: CM3109-00SH
• Description: 2A Sink/Source Regulator for Front Side Bus and DDR Memory Bus Termination
• Manufacturer: CALMIRCO [California Micro Devices Corp]

01/15/04
Application Information (cont’d)
The above diagram shows the CM3109 connected to
the Intel 865 GMCH Front Side Bus V
VCCP. The Enable signal GMCH_EN is used to shut
down the output of the CM3109 to save power during
© 2004 California Micro Devices Corp. All rights reserved.
VCC (CPU Core)
GMCHVCCP
Figure 19. Front Side Bus Timing diagram
GMCH_EN
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
GMCH_EN
BOOTSEL
V
DDQ
Figure 18. Typical Front Side Bus with Suspend to RAM Application Circuit
V
SEL
DDQ
R
VDDQ
4.7K
SEL
CV
47uF
DDQ
TT
FSBSEL
0.1uF
pin GMCH-
V
FSBSEL
▲ Tel: [phone]
DDQ
VDDQ
SD
SEL
shutdown periods. The V
the CM3109 is in Front Side Bus mode, and the BOOT-
SEL from the GMCH ensures the right Microprocessor
V
V
VSENSE
GND
V
TT
Open or "0"
Open or "0"
CC
V
CC
DDQ
voltage is applied.
Table 1: V
V
"1"
TT
SEL
▲
Fax: [phone]
Note 1:Assumes V
together in DDR application.
TT
Don’t Care
FSBSEL
Output Selection Truth Table.
CV
47uF
"0"
"1"
CC
CV
220uF
DDQ
TT
GMCHVCCP
DDQ
SEL input ensures that
(see note 1)
V
▲
DDQ
1.225V
1.45V
V
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and V
TT
SEL/2
DDQ
CM3109
SEL are tied
For DDR
For FSB
For FSB
NOTE
11