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HYMP532S646-E3 Datasheet, PDF (11/23 Pages) Hynix Semiconductor – 200pin Unbuffered DDR2 SDRAM SO-DIMMs based on 512 Mb 1st ver.
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1200pin Unbuffered DDR2 SDRAM SO-DIMMs
Differential Input AC logic Level
Symbol
VID (ac)
VIX (ac)
Parameter
ac differential input voltage
ac differential cross point voltage
Min.
0.5
0.5 * VDDQ - 0.175
Max.
VDDQ + 0.6
0.5 * VDDQ + 0.175
Units
V
V
Note
1
2
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) - VIL(DC).
VTR
VCP
VDDQ
VID
Crossing point
VIX or VOX
VSSQ
< Differential signal levels >
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) - 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 whitch differential input signals must cross.
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
Notes:
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 whitch differential output signals must cross.
Rev. 1.0 / Feb. 2005
11
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