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256MB, 512MB Registered DIMMs

Absolute Maximum DC Ratings

Symbol VDDVDDQ VDDLVIN, VOUT TSTG

Parameter

Voltage on VDD pin relative to VSSVoltage on VDDQ pin relative to VSSVoltage on VDDL pin relative to VSSVoltage on any pin relative to VSSStorage Temperature

Rating- 1.0 V ~ 2.3 V- 0.5 V ~ 2.3 V- 0.5 V ~ 2.3 V- 0.5 V ~ 2.3 V-55 to +100

DDR2 SDRAM

UnitsV V V V

Notes1111

°2

Note :

1. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

2. Storage Temperature is the case surface temperature on the center/top side of the DRAM. For the measurement conditions, please refer to JESD51-2 standard.

AC & DC Operating Conditions

Recommended DC Operating Conditions (SSTL - 1.8)

SymbolVDDVDDLVDDQVREFVTT

Supply VoltageSupply Voltage for DLLSupply Voltage for OutputInput Reference VoltageTermination Voltage

Parameter

Rating

Min.1.71.71.70.49*VDDQVREF-0.04

Typ. 1.81.81.80.50*VDDQ

VREF

Max.1.91.91.90.51*VDDQVREF+0.04

UnitsVVVmVV

441,23Notes

Note : There is no specific device VDD supply voltage requirement for SSTL-1.8 compliance. However under all conditions VDDQ must be less than or equal

to VDD.

1. The value of VREF may be selected by the user to provide optimum noise margin in the system. Typically the value of VREF is expected to be about 0.5 x VDDQ of the transmitting device and VREF is expected to track variations in VDDQ.2. Peak to peak AC noise on VREF may not exceed +/-2% VREF(DC).3. VTT of transmitting device must track VREF of receiving device.

4. AC parameters are measured with VDD, VDDQ and VDDL tied together.