5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
The unconnected VTTs
are left unconnected
to remain compatible
with the
Celeron(tm).
Spare Decoupling Caps: Do Not Populate
VREF decoupling:
* Intel recommends four or more 0.1uF
caps in a 0603 package placed near
VREF pins within 500 mils.
* Make MREF short/wide 24 mils minimum
4.7uF decoupling capacitors must be place within
the socket cavity and mounted directly on the
primary side of the board. The traces must be as
short and wide as possible. Use 1206 package.
4.7uF 4.7uF 4.7uF1uF 1uF 1uF 1uF 1uF
Intel(R) 440BX Scalable Performance Board A3
S370-256 Power
Embedded Intel Architecture Division
Intel Corporation
5000 W. Chandler Blvd
Chandler AZ, 85044
C
512Wednesday, April 26, 2000
Title
Size Document Number Rev
Date: Sheet
of
VCCCORE
VCCCORE
VTTVCC_CMOS
VGTLREF_CPU
VCCCORE
V2_5
VCCCOREVCCCORE
VGTLREF_CPU
C39
4.7uF
10V
X7R
C4
0.1uF
C3
0.1uF
C6
0.1uF
C5
0.1uF
Power Supply
U1B
S370-25 6
AL3
AM10
AM14
AM18
AM22
AM26
AM30
AM34
AM6
AN3
B12
B16
B20
B24
B28
B32
B4
B8
D18
D2
D22
D26
D30
D34
D4
E11
E15
E19
E7
F20
F24
F28
F32
F36
G5
D20
D24
D28
D32
D36
D6
E13
E17
E5
E9
F14
F2
F22
F26
F30
F34
F4
H32
H36
J5
K2
K34
M32
N5
P2
P34
R32
R36
S5
T2
T34
V32
AN21
E23
G35
S33
S37
U35
U37
H2
H34
K36
K32
A37
AB32
AC33
AC5
AD2
AD34
AF32
AF36
AG5
AH2
AH34
AA37
AA5
AB2
AB34
AD32
AE5
AF2
AF34
AH24
AH32
AH36
AJ13
AJ17
AJ21
AJ25
AJ29
AJ5
AA33
AA35
AH20
AK16
AL13
AL21
AN11
AN15
AJ3
AJ11
AJ15
AJ19
AJ23
AJ27
AJ7
AK36
AK4
AL1
L5
M2
M34
P32
P36
Q5
R34
T32
T36
U5
V2
V34
X32
X36
Y37
Y5
Z2
Z34
AJ9
AK2
AK34
AM12
AM16
AM20
AM24
AM28
AM32
AM4
AM8
B10
B14
B18
B22
B26
B30
B34
B6
C3
V36
W5
X34
Y35
Z32
AD36
Z36
AB36
E33
F18
K4
R6
V6
AD6
AK12
AK22
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VTT
VTT
VTT
VTT
VTT
VTT
VTT
GND
GND
GND
VCC_CORE
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VTT
VTT
VTT
VTT
VTT
VTT
VTT
VTT
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_CORE
VCC_15
VCC_25
VCC_CMOS
VREF0
VREF1
VREF2
VREF3
VREF4
VREF5
VREF6
VREF7
C40
EMPTY
10V
X7R
C41
EMPTY
10V
X7R
C44
EMPTY
10V
X7R
C43
EMPTY
10V
X7R
C42
EMPTY
10V
X7R
C7
0.1uF
C8
0.1uF
C9
0.1uF
C149
0.1uF
C25
4.7uF
10V
X7R
C26
4.7uF
10V
X7R
C29
4.7uF
10V
X7R
C28
4.7uF
10V
X7R
C27
4.7uF
10V
X7R
C45
EMPTY
10V
X7R
C46
EMPTY
10V
X7R
C47
EMPTY
10V
X7R
C36
4.7uF
10V
X7R
C35
4.7uF
10V
X7R
C37
4.7uF
10V
X7R
C38
4.7uF
10V
X7R
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