K4T1G084QA-ZCCC View Datasheet(PDF) - Samsung

Part Name

Description

Manufacturer

K4T1G084QA-ZCCC

1Gb A-die DDR2 SDRAM Specification

Samsung 

1G A-die DDR2 SDRAM

DDR2 SDRAM

Differential input AC logic Level

Symbol

Parameter

Min.

Max.

Units

Notes

VID(AC)

AC differential input voltage

0.5

VDDQ + 0.6

V

1

VIX(AC)

AC differential cross point voltage

0.5 * VDDQ - 0.175

0.5 * VDDQ + 0.175

V

2

Notes :

1. VID(AC) specifies the input differential voltage |VTR -VCP | required for switching, where VTR is the true input signal (such as CK, DQS, LDQS or

UDQS) and VCP is the complementary input signal (such as CK, DQS, LDQS or UDQS). The minimum value is equal to VIH (AC) - VIL(AC).

2. The typical value of VIX(AC) is expected to be about 0.5 * VDDQ of the transmitting device and VIX(AC) is expected to track variations in VDDQ. VIX(AC)

indicates the voltage at which differential input signals must cross.

VTR

VCP

VDDQ

VID

Crossing point

VIX or VOX

VSSQ

< Differential signal levels >

Differential AC output parameters

Symbol

VOX(AC)

Parameter

AC differential cross point voltage

Min.

0.5 * VDDQ - 0.125

Max.

0.5 * VDDQ + 0.125

Units

V

Note

1

Note :

1. The typical value of VOX(AC) is expected to be about 0.5 * VDDQ of the transmitting device and VOX(AC) is expected to track variations in VDDQ.

VOX(AC) indicates the voltage at which differential output signals must cross.

Page 13 of 28

Rev. 1.1 Aug. 2005

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