EDD2508AKTA-5 datasheet(4/48 Pages) ELPIDA

Part #	EDD2508AKTA-5

Description	256M bits DDR SDRAM (32M words x 8 bits, DDR400)

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Manufacturer	ELPIDA [Elpida Memory]

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EDD2508AKTA-5

Preliminary Data Sheet E0349E60 (Ver. 6.0)

4

Electrical Specifications

• All voltages are referenced to VSS (GND).

• After power up, wait more than 200 µs and then, execute power on sequence and CBR (Auto) refresh before

proper device operation is achieved.

Absolute Maximum Ratings

Parameter

Symbol

Rating

Unit

Note

Voltage on any pin relative to VSS

VT

–1.0 to +3.6

V

Supply voltage relative to VSS

VDD

–1.0 to +3.6

V

Short circuit output current

IOS

50

mA

Power dissipation

PD

1.0

W

Operating ambient temperature

TA

0 to +70

°C

Storage temperature

Tstg

–55 to +125

°C

Caution

Exposing the device to stress above those listed in Absolute Maximum Ratings could cause

permanent damage. The device is not meant to be operated under conditions outside the limits

described in the operational section of this specification. Exposure to Absolute Maximum Rating

conditions for extended periods may affect device reliability.

Recommended DC Operating Conditions (TA = 0 to +70

°C)

Parameter

Symbol

min.

typ.

max.

Unit

Notes

Supply voltage

VDD,

VDDQ

2.5

2.6

2.7

V

1

VSS,

VSSQ

0

V

Input reference voltage

VREF

0.49

× VDDQ

0.50

× VDDQ 0.51 × VDDQ

V

Termination voltage

VTT

VREF – 0.04

VREF

VREF + 0.04

V

Input high voltage

VIH (DC)

VREF + 0.15

—

VDDQ + 0.3

V

2

Input low voltage

VIL (DC)

–0.3

—

VREF – 0.15

V

3

Input voltage level,

CK and /CK inputs

VIN (DC)

–0.3

—

VDDQ + 0.3

V

4

Input differential cross point

voltage, CK and /CK inputs

VIX (DC)

0.5

× VDDQ − 0.2V 0.5 × VDDQ

0.5

× VDDQ + 0.2V V

Input differential voltage,

CK and /CK inputs

VID (DC)

0.36

—

VDDQ + 0.6

V

5, 6

Notes: 1. VDDQ must be lower than or equal to VDD.

2. VIH is allowed to exceed VDD up to 3.6V for the period shorter than or equal to 5ns.

3. VIL is allowed to outreach below VSS down to –1.0V for the period shorter than or equal to 5ns.

4. VIN (DC) specifies the allowable DC execution of each differential input.

5. VID (DC) specifies the input differential voltage required for switching.

6. VIH (CK) min assumed over VREF + 0.18V, VIL (CK) max assumed under VREF – 0.18V

if measurement.

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