AMB0480A5 Integrated Device Technology, AMB0480A5 Datasheet - Page 14

• Manufacturer Part Number: AMB0480A5
• Description: Advanced Memory Buffer For Fully Buffered Dimm Modules
• Manufacturer: Integrated Device Technology

NOTES:
1. Refer to JEDEC PC2-4200/5300/6400 DDR2 FULLY BUFFERED DIMM DESIGN SPECIFICATIONS, rev 2.0.
2. Component values for the AMB0480 are summarized in the BIAS COMPONENT table.
BIAS COMPONENTS - RECOMMENDED VALUES AMB0480
MISCELLANEOUS BIAS
IDTAMB0480
ADVANCED MEMORY BUFFER FOR FULLY BUFFERED DIMM
Schematic Diagram
R
R
PLL and Channel
V
3
V
1
Miscellaneous
DD
SS
DDR Bias
R
R
4
2
V
HVM
SS
RPLLTSTO
Reference
R
RSA0
RC
RC
FBDRES
RB
RB
C
C
R
R
R
R
R
L
1
2
3
4
1
2
12
12
18
18
Not loaded
Not loaded
Value
825Ω
121Ω
100Ω
825Ω
10μF
10μF
82Ω
82Ω
51Ω
V
0Ω
0Ω
0Ω
0Ω
SS
TESTLO_AC20
TESTLO_AB20
TESTLO_F8
TESTLO_A13
TESTLO_B13
TESTLO_B17
TESTLO_G16
BFUNC
The impedance of the pull up (PRU) and pull down (PRD) on the AMB DDR Outputs is relatedto RB
& RC
RC
A resistor value of 82Ω results in an impedance at a JEDEC nominal value of 15Ω. The user can adjust
these value to optimize the DDR output impedance for a DIMM raw card configuration.
Resistor R must be 0Ω
Inductor L needs to be replaced with a 0Ω resistor
12
12
= RB
as follows:
12
= 5.3125 * Desired Output Impedance
14
AMB0480
Description
SA0
TEST_F9
TEST_A17
TEST_F21
TEST_F22
COMMERCIAL TEMPERATURE RANGE
R
SA0
NC
NC
NC
NC
Gold Finger
SA0
SPD
12