1HY5PS12421B(L)FP
1HY5PS12821B(L)FP
1HY5PS121621B(L)FP
3.2.4 Differential Input AC logic Level
Symbol
Parameter
Min.
Max.
Units
Notes
VID (ac)
0.5
VDDQ + 0.6
V
1
ac differential input voltage
ac differential cross point voltage
VIX (ac)
0.5 * VDDQ - 0.175 0.5 * VDDQ + 0.175
V
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) - V IL(DC).
V
DDQ
V
TR
Crossing point
V
ID
V
V
IX or OX
V
CP
V
SSQ
< Differential signal levels >
Note:
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
Symbol
OX (ac)
Note:
Parameter
Min.
Max.
Units Notes
V
0.5 * VDDQ - 0.125 0.5 * VDDQ + 0.125
V
1
ac differential cross point voltage
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 whitch differential output signals
must cross.
Rev. 0.7 / Oct. 2007
13
HYNIX [ HYNIX SEMICONDUCTOR ]
