AS4C64M8D2 datasheet(20/59 Pages) ALSC

20 / 59 page

AS4C64M8D2

Confidential

Rev. 1.0

Feb. /2014

Table 13. Absolute Maximum DC Ratings

Symbol

Parameter

Rating

Unit Note

VDD

Voltage on VDD pin relative to Vss

-1.0 ~ 2.3

1,3

VDDQ

Voltage on VDDQ pin relative to Vss

-0.5 ~ 2.3

1,3

VDDL

Voltage on VDDL pin relative to Vss

-0.5 ~ 2.3

1,3

VIN, VOUT Voltage on any pin relative to Vss

- 0.5 ~ 2.3

1,4

TSTG

Storage temperature

- 55~100

°C

1,2

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

Unit Note

TOPER

Normal operating temperature

0~85

°C

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.

Typ.

Max.

Unit Note

VDD

Power supply voltage

1.7

1.8

1.9

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

2,3

VTT

Termination voltage

VREF - 0.04

VREF

VREF + 0.04

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

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