T
T
T
S
S
S
3
3
3
2
2
2
M
M
M
M
M
M
Q
Q
Q
6
6
6
4
4
4
V
V
V
5
5
5
M
M
M
214PIN DDR2 533 Micro-DIMM
256MB With 32Mx16 CL4
Absolute Maximum DC Ratings
Parameter Symbol Value Unit Notes
Voltage on VDD relative to Vss VDD -1.0 ~ 2.3 V 1
Voltage on VDDQ pin relative to Vss VDDQ -0.5 ~ 2.3 V 1
Voltage on VDDL pin relative to Vss VDDL -0.5 ~ 2.3 V 1
Voltage on any pin relative to Vss VIN, VOUT -0.5 ~ 2.3 V 1
Storage temperature TSTG -55~+100 °C 1,2
Mean time between failure MTBF Reserved year
Temperature Humidity Burning THB Reserved °C-%
Temperature Cycling Test TC Reserved °C
1.Stress greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the
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.
Note:
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)
Rating
Parameter Symbol
Min Typ. Max
Unit Notes
Supply voltage VDD 1.7 1.8 1.9 V
Supply voltage for DLL VDDL 1.7 1.8 1.9 V 4
Supply voltage for Output VDDQ 1.7 1.8 1.9 V 4
I/O Reference voltage VREF 0.49*VDDQ 0.50*VDDQ 0.51*VDDQ V 1,2
I/O Termination voltage VTT VREF-0.04 VREF VREF+0.04 V 3
DC Input logic high VIH(DC) VREF+0.125 - VDDQ+0.3 V
DC Input logic low VIL(DC) -0.3 - VREF-0.125 V
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.
Note:
4.AC parameters are measured with VDD, VDDQ and VDDDL tied together.
Operating Temperature Condition
Parameter Symbol Rating Unit Note
Operating Temperature TOPER 0 to 95 °C 1,2,3
1.Operating Temperature is the case surface temperature on the center/top side of the DRAM. For the
measurement conditions, please refer to JESD51.2 standard.
2. At 0 - 85°C, operation temperature range are the temperature which all DRAM specification will be supported.
Note:
3. At 85 - 95 °C operation temperature range, doubling refresh commands in frequency to a 32ms period
( tREFI=3.9 us ) is required, and to enter to self refresh mode at this temperature range, an EMRS command is
required to change internal refresh rate.
Transcend Information Inc.
5
(11 pages)
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