14.8.15. Ich4-M Decoupling Recommendations - Intel 852GM Design Manual

Platform Design Checklist

14.8.15. ICH4-M Decoupling Recommendations

Pin Name
VCC1.5
VCC3.3
VCCSUS1.5
VCCSUS3.3
VCCLAN1.5
VCCLAN3.3
VCC5REF
VCC5REFSUS
VCC_CPU_IO
VCCPLL
VCCRTC
VCCHI
All decoupling guidelines are recommendations based on our reference board design. Customers will need
NOTE:
to take their layout and PCB board design into consideration when deciding on their overall decoupling
solution. Capacitors should be place less than 100 mils from the package.
266
Configuration Value
Connect to Vcc1_5 0.1 µF
Connect to Vcc3_3 0.1 µF
Connect to 0.1 µF
V1_5ALWAYS
Connect to 0.1 µF
V3ALWAYS
Connect to 0.1 µF
VccSus1_5
Connect to 0.1 µF
VccSus3_3
4.7 µF
Connect to Vcc5 0.1 µF
through 1K Ω
1 µF
Connect to 0.1 µF
V5ALWAYS through
1 µF
1K Ω
Connect to VCCP 0.1 µF
1 µF
Connect to Vcc1_5 0.1 µF
0.01 µF
Connect to VccRTC 0.1 µF
Connect to Vcc1_5 0.1 µF
Q Notes
2 Low frequency decoupling is dependent on
layout and power supply design. CRB uses
one 22 µF and one 100 µF.
6 Low frequency decoupling is dependent on
layout and power supply design. CRB uses
two 22 µF.
2 Low frequency decoupling is dependent on
layout and power supply design. CRB uses
one 10 µF.
2 Low frequency decoupling is dependent on
layout and power supply design. CRB uses
one 22 µF.
2 Low frequency decoupling is dependent on
layout and power supply design. CRB uses
one 22 µF.
2 Low frequency decoupling is dependent on
layout and power supply design. CRB uses
1
one 22 µF.
1 Caps from VCC5REF to ground. Also connect
diode from VCC5REF to Vcc3_3.
1
1 Caps from VCC5REFSUS to ground. Also
connect diode from VCC5REFSUS to
1
V3ALWAYS.
1
1
1
1
1
2 Low frequency decoupling is dependent on
layout and power supply design. CRB uses
one 22 µF.
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Intel 852GM Chipset Platform Design Guide
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