Apacer Memory Product Specification
• JEDEC standard 1.8V ± 0.1V Power Supply
• VDDQ = 1.8V ± 0.1V
• Internal Bank:8 Bank
• Posted CAS
• Programmable CAS Latency: 3, 4, 5
• Programmable Additive Latency: 0, 1 , 2 , 3 and 4
• Write Latency(WL) = Read Latency(RL) -1
• Burst Length: 4 , 8(Interleave/nibble sequential)
• Programmable Sequential / Interleave Burst Mode
• Bi-directional Differential Data-Strobe (Single-ended data-strobe is an optional feature)
• Off-Chip Driver(OCD) Impedance Adjustment
• On Die Termination
• Refresh and Self Refresh
Average Refesh Period 7.8us
• Serial presence detect with EEPROM
• DDR2 SDRAM Package: 60ball FBGA - 128Mx8
2048MB DDR2 DIMM
2048M DDR2 DIMM based on 128
MX8
, 8Banks, 1.8V DDR2 DIMM with SPD
Features
.Performance range ( Bandwidth: 6.4 GB/sec )
Part No.
Max Freq. (Clock)
78.A1GAR.XX4 400MHz(2.5ns@CL6)
Pin Description
*The VDD and VDDQ pins are tied to the single power-plane on PCB.
Pin Name Description Pin Name Description
A0-A13 DDR2 SDRAM address bus CK0, CK1, CK2 DDR2 SDRAM clocks (positive line of differential pair)
BA0-BA2 DDR2 SDRAM bank select CK
0, CK1, CK2 DDR2 SDRAM clocks (negative line of differential pair)
RAS
DDR2 SDRAM row address strobe SCL
I
2
C serial bus clock for EEPROM
CAS
DDR2 SDRAM column address strobe SDA
I
2
C serial bus data line for EEPROM
WE
DDR2 SDRAM wirte enable SA0-SA2
I
2
C serial address select for EEPROM
S
0, S1 DIMM Rank Select Lines
V
DD
*
DDR2 SDRAM core power supply
CKE0,CKE1 DDR2 SDRAM clock enable lines
V
DDQ
*
DDR2 SDRAM I/O Driver power supply
ODT0, ODT1 On-die termination control lines
V
REF
DDR2 SDRAM I/O reference supply
DQ0 - DQ63 DIMM memory data bus
V
SS
Power supply return (ground)
CB0 - CB7 DIMM ECC check bits
V
DD
SPD
Serial EEPROM positive power supply
DQS0 - DQS8 DDR2 SDRAM data strobes NC Spare Pins(no connect)
DM(0-8) DDR2 SDRAM data masks RESET Not used on UDIMM
DQS
0-DQS8 DDR2 SDRAM differential data strobes TEST
Used by memory bus analysis tools (unused on memory
DIMMs)
• Compliance with CE
• Compliance with RoHS
Speed Grade
800 Mbps
• Operating Temperature Rang TC(case) 0~85 degree
