AS4C64M8D2
Table 13. Absolute Maximum DC Ratings
Symbol
Parameter
Rating
-1.0 ~ 2.3
-0.5 ~ 2.3
-0.5 ~ 2.3
- 0.5 ~ 2.3
- 55~100
Unit Note
VDD
Voltage on VDD pin relative to Vss
V
V
V
V
1,3
1,3
1,3
1,4
1,2
VDDQ Voltage on VDDQ pin relative to Vss
VDDL Voltage on VDDL pin relative to Vss
VIN, VOUT Voltage on any pin relative to Vss
TSTG Storage temperature
C
°
NOTE1: Stress greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the
devices. 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.
NOTE2: Storage temperature is the case temperature on the center/top side of the DRAM.
NOTE3: When VDD and VDDQ and VDDL are less than 500mV, Vref may be equal to or less than 300mV.
NOTE4: Voltage on any input or I/O may not exceed voltage on VDDQ
.
Table 14. Operating Temperature Condition
Symbol
Parameter
Rating
0~85
Unit Note
Normal operating temperature
C
°
°
1
TOPER
Extended operating temperature
85~95
C
1,2
NOTE1: Operating temperature is the case surface temperature on center/top of the DRAM.
NOTE2: If TC exceeds 85°C, the DRAM must be refreshed externally at 2x refresh. It is required to set tREFI=3.9μs
in auto refresh mode and to set ‘1’ for EMRS (2) bit A7 in self refresh mode.
Table 15. Recommended DC Operating Conditions (SSTL_1.8)
Symbol
Parameter
Min.
1.7
Typ.
1.8
Max.
1.9
Unit Note
VDD
Power supply voltage
V
V
V
1
5
VDDL Power supply voltage for DLL
1.7
1.8
1.9
VDDQ Power supply voltage for I/O Buffer
1.7
1.8
1.9
1,5
VREF Input reference voltage
0.49 x VDDQ
0.5 x VDDQ
0.51 x VDDQ
mV 2,3
VTT
Termination voltage
VREF - 0.04
VREF
VREF + 0.04
V
4
NOTE1: There is no specific device VDD supply voltage requirement for SSTL_18 compliance. However under all
conditions VDDQ must be less than or equal to VDD.
NOTE2: 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
.
±
NOTE3: Peak to peak ac noise on VREF may not exceed 2 % VREF (dc).
NOTE4: VTT of transmitting device must track VREF of receiving device.
NOTE5: VDDQ tracks with VDD, VDDL tracks with VDD. AC parameters are measured with VDD, VDDQ and VDDL tied
together
Confidential
20
Rev. 1.0
Feb. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
