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HY5PS12421F-E3 Datasheet(PDF) 13 Page - Hynix Semiconductor |
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HY5PS12421F-E3 Datasheet(HTML) 13 Page - Hynix Semiconductor |
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13 / 35 page  Rev. 1.4 / July 2006 13 1HY5PS12421(L)F HY5PS12821(L)F HY5PS121621(L)F 3.2.4 Differential Input AC logic Level 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) . 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 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 Notes: 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. Symbol Parameter Min. Max. Units Notes V ID (ac) ac differential input voltage 0.5 VDDQ + 0.6 V 1 V IX (ac) ac differential cross point voltage 0.5 * VDDQ - 0.175 0.5 * VDDQ + 0.175 V 2 Symbol Parameter Min. Max. Units Notes V OX (ac) ac differential cross point voltage 0.5 * VDDQ - 0.125 0.5 * VDDQ + 0.125 V 1 VDDQ Crossing point VSSQ VTR VCP VID VIX or VOX < Differential signal levels > |
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