240pin DDR2 SDRAM Unbuffered DIMMs based on 2Gb A version
This Hynix unbuffered Dual In-Line Memory Module (DIMM) series consists of 2Gb A version DDR2
SDRAMs in Fine Ball Grid Array (FBGA) packages on a 240pin glass-epoxy substrate. This Hynix 2Gb
version A based DDR2 Unbuffered DIMM series provide a high performance 8 byte interface in 133.35mm
width form factor of industry standard. It is suitable for easy interchange and addition.
FEATURES
•
JEDEC standard Double Data Rate2
Synchronous DRAMs (DDR2 SDRAMs) with
1.8V +/- 0.1V Power Supply
•
All inputs and outputs are compatible with
SSTL_1.8 interface
•
•
•
•
•
•
8 Bank architecture
•
Posted CAS
•
Programmable CAS Latency 3,4,5, 6
OCD (Off-Chip Driver Impedance Adjustment)
ODT (On-Die Termination)
•
•
DDR2 SDRAM Package:
60ball FBGA(256Mx8)
133.35 x 30.00 mm form factor
RoHS compliant
Serial presence detect with EEPROM
8192 refresh cycles / 64ms
•
•
•
Fully differential clock operations (CK & CK)
Programmable Burst Length 4 / 8 with both
sequential and interleave mode
Auto refresh and self refresh supported
ORDERING INFORMATION
# of
DRAM
s
16
18
# of
ranks
2
2
Part Name
HMP351U6AFR8C - Y5/S5/S6
HMP351U7AFR8C - Y5/S5/S6
Density
4GB
4GB
Org.
512Mx64
512Mx72
Materials
Halogen-free
Halogen-free
ECC
None
ECC
This document is a general product description and is subject to change without notice. Hynix Semiconductor does not assume any
responsibility for use of circuits described. No patent licenses are implied.
Rev. 0.1 / Mar 2009
1
1240pin
DDR2 SDRAM Unbuffered DIMMs
Input/Output Functional Description
Symbol
CK[2:0], CK[2:0]
Type
SSTL
Polarity
Differential
Crossing
Pin Description
CK and /CK are differential clock inputs. All the DDR2 SDRAM addr/cntl inputs are sam-
pled on the crossing of positive edge of CK and negative edge of /CK. Output(read) data
is reference to the crossing of CK and /CK (Both directions of crossing)
Activates the DDR2 SDRAM CK signal when high and deactivates the CK signal when
low. By deactivating the clocks, CKE low initiates the Power Down mode or the Self
Refresh mode.
Enables the associated DDR2 SDRAM command decoder when low and disables the
CKE[1:0]
SSTL
Active High
S[1:0]
SSTL
Active Low
command decoder when high. When the command decoder is disabled, new commands
are ignored but previous operations continue. Rank 0 is selected by S0; Rank 1 is
selected by S1
RAS, CAS,
WE
ODT[1:0]
SSTL
SSTL
Supply
Supply
SSTL
Active Low
Active High
/RAS,/CAS and /WE(ALONG WITH S) define the command being entered.
Asserts on-die termination for DQ, DM, DQS and DQS signals if enabled via the DDR2
SDRAM mode register.
Reference voltage for SSTL18 inputs
Power supplies for the DDR2 SDRAM output buffers to provide improved noise immu-
nity. For all current DDR2 unbuffered DIMM designs, V
DDQ
shares the same power plane
as V
DD
pins.
Vref
V
DDQ
BA[2:0]
-
Selects which DDR2 SDRAM internal bank of four or eight is activated.
During a Bank Activate command cycle, Address input defines the row
address(RA0~RA15)
During a Read or Write command cycle, Address input defines the column address when
sampled at the cross point of the rising edge of CK and falling edge of CK. In addition to
A[9:0], A10/AP,
A[13:11]
SSTL
-
the column address, AP is used to invoke autoprecharge operation at the end of the
burst read or write cycle. If AP is high., autoprecharge is selected and BA0-BAn defines
the bank to be precharged. If AP is low, autoprecharge is disabled. During a Precharge
command cycle., AP is used in conjunction with BA0-BAn to control which bank(s) to
precharge. If AP is high, all banks will be precharged regardless of the state of BA0-BAn
inputs. If AP is low, then BA0-BAn are used to define which bank to precharge.
DQ[63:0],
CB[7:0]
SSTL
-
Data and Check Bit Input/Output pins.
DM is an input mask signal for write data. Input data is masked when DM is sampled
DM[8:0]
SSTL
Active High
High coincident with that input data during a write access. DM is sampled on both edges
of DQS. Although DM pins are input only, the DM loading matches the DQ and DQS
loading.
Power and ground for the DDR2 SDRAM input buffers, and core logic. V
DD
and V
DDQ
pins are tied to V
DD
/V
DDQ
planes on these modules.
Data strobe for input and output data. For Rawcards using x16 organized DRAMs,
DQ0~7 connect to the LDQS pin of the DRAMs and DQ8~15 connect to the UDQS pin of
the DRAM
These signals are tied at the system planar to either V
SS
or V
DD
to configure the serial
SPD EEPROM.
This is a bidirectional pin used to transfer data into or out of the SPD EEPROM. A
resister must be connected to V
DD
to act as a pull up.
This signal is used to clock data into and out of the SPD EEPROM. A resistor may be
connected from SCL to V
DD
to act as a pull up on the system board.
Power supply for SPD EEPROM. This supply is separate from the VDD/VDDQ power
plane. EEPROM supply is operable from 1.7V to 3.6V.
V
DD
,V
SS
DQS[8:0],
DQS[8:0]
SA[2:0]
SDA
SCL
VDDSPD
Supply
Differential
crossing
-
-
-
Supply
SSTL
Rev. 0.1 / Mar 2009
3
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