EDE2504AASE-6E-E datasheet(6/66 Pages) ELPIDA

Part #	EDE2504AASE-6E-E

Description	256M bits DDR2 SDRAM

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Manufacturer	ELPIDA [Elpida Memory]

Direct Link	http://www.elpida.com/en

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6 / 66 page

EDE2504AASE, EDE2508AASE, EDE2516AASE

Preliminary Data Sheet E0427E11 (Ver. 1.1)

6

Recommended DC Operating Conditions (SSTL_18)

Parameter

Symbol

min.

typ.

max.

Unit

Notes

Supply voltage

VDD

1.7

1.8

1.9

V

4

Supply voltage for output

VDDQ

1.7

1.8

1.9

V

4

Supply voltage for DLL

VDDL

1.7

1.8

1.9

V

4

Input reference voltage

VREF

0.49

× VDDQ

0.50

× VDDQ 0.51 × VDDQ

V

1, 2

Termination voltage

VTT

VREF

− 0.04

VREF

+ 0.04

V

3

DC input logic high

VIH (DC)

VREF

+ 0.125



VDDQ

+ 0.3V

V

DC input low

VIL (DC)

−0.3



VREF – 0.125

V

AC input logic high

VIH (AC)

VREF

+ 0.250



V

AC input low

VIL (AC)



VREF

− 0.250

V

Notes: 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

× VDDQ of the transmitting device and VREF are 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. VDDQ tracks with VDD, VDDL tracks with VDD. AC parameters are measured with VDD, VDDQ and

VDDL tied together.

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EDE2504AASE-6E-E Datasheet(PDF) 6 Page - Elpida Memory

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