H5PS1G63JFR データシートの表示（PDF） - Hynix Semiconductor

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H5PS1G63JFR

1Gb DDR2 SDRAM

Hynix Semiconductor 

3.2.4 Differential Input AC logic Level

Release

H5PS1G63JFR Series

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

Note:

1. VIN(DC) specifies the allowable DC execution of each input of differential pair such as CK, CK, DQS, DQS, LDQS,

LDQS, UDQS and UDQS.

2. VID(DC) specifies the input differential voltage |VTR -VCP | required for switching, where VTR is the true input

(such as CK, DQS, LDQS or UDQS) level and VCP is the complementary input (such as CK, DQS, LDQS or UDQS)

level.

The minimum value is equal to VIH(DC) - V IL(DC).

VTR

VCP

VDDQ

VID

Crossing point

VIX or VOX

VSSQ

< Differential signal levels >

Note:

1. VID(AC) specifies the input differential voltage |VTR -VCP | required for switching, where VTR is the true input sig-

nal

(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 V IH(AC) - V IL(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.

3.2.5 Differential AC output parameters

Symbol

Parameter

VOX (ac) ac differential cross point voltage

Min.

Max.

Units Notes

0.5 * VDDQ - 0.125 0.5 * VDDQ + 0.125 V

1

Note:

1. The typical value of VOX(AC) is expected to be about 0.5 * V DDQ 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.

Rev. 1.7 / Nov. 2011

12

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