Decoupling Recommendations; Vccp (I/O); Vcca (Pll); Vcc (Core) - Intel 855GME Design Manual

®
Intel 855GME Chipset and Intel
12.1.3

Decoupling Recommendations

12.1.3.1

VCCP (I/O)

Table 117
Table 117. VCCP (I/O) Decoupling Recommendations
Description
Low Frequency Decoupling
(Polymer Covered Tantalum -
POSCAP, Neocap, KO Cap)
High Frequency Decoupling
(0603 MLCC, >= X7R)
12.1.3.2

VCCA (PLL)

Table 118
Table 118. VCCA (PLL) Decoupling Recommendations
Mid Frequency Decoupling
(Polymer Covered Tantalum -
POSCAP, Neocap, KO Cap)
High Frequency Decoupling
(0603 MLCC, >= X7R). Place
next to Pentium M processor.
12.1.3.3

VCC (CORE)

Table 119
Table 119. VCC (CORE) Decoupling Recommendations (Sheet 1 of 2)
Option
#1
#2
NOTES:
1. Decoupling guidelines are recommendations based on Intel reference board design. The Intel Customer
Reference Board uses option #4. This is the preferred recommendation for decoupling.
2. When deciding on overall decoupling solution, customers may need to take layout and PCB board design
into consideration.
3. Option #4 is to be used with small footprint (100 mm
presents the VCCP (I/O) decoupling recommendations.
C, μ F
2 x 150 μ F
10 x 0.1 μ F
presents the VCCA (PLL) decoupling recommendations.
Description
4 x 0.01 μ F
presents the VCC (CORE) decoupling recommendations.
Description
Low-Frequency Decoupling (Polymer
Covered Tantalum – POSCAP,
Neocap, KO Cap)
Mid-Frequency Decoupling
(0612 MLCC, X5R or better)
Low-Frequency Decoupling
(1206 MLCC, X5R or better)
Mid-Frequency Decoupling
(0612 MLCC, X5R or better)
January 2007
®
6300ESB ICH Embedded Platform Design Guide
ESR, m Ω
ESL, nH
42 m Ω (typ)/2
2.5 nH/2
16 m Ω (typ)/10
0.6 nH/10
C, μ F
Place one 10 μ F and one 0.01 μ F for each
4 x 10 μ F
VCCA pin.
Place one 10 μ F and one 0.01 μ F for each
VCCA pin.
C, μ F
12 x 150 μ F
15 x 2.2 μ F
40x10 μ F
15 x 2.2 μ F
2
or less) 0.36 µH ± 20% inductors.
Schematic Checklist Summary
Notes
Refer to Section 4.4.4
implementation of
recommended decoupling.
Notes
ESR, m Ω
ESL, nH
36 m Ω (typ)/12
2.5 nH/12
5 m Ω (typ)/15
0.2 nH/15
5 m Ω (typ)/40
1.2 nH/40
5 m Ω (typ)/15
0.2 nH/15
√
for
√
√
269