46DR83200A Datasheet, PDF (10/48 Pages) Integrated Silicon Solution, Inc – 32Mx8, 16Mx16 DDR2 DRAM

IS43/46DR83200A, IS43/46DR16160A
Differential input AC Logic Level
Symbol Parameter
Min.
Max.
Units Notes
VID (ac) ac differential input voltage
0.5
VDDQ
V 1,3
VIX (ac) ac differential crosspoint voltage 0.5 x VDDQ - 0.175 0.5 x VDDQ + 0.175
V2
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 and
VCP is the complementary input signal (such as CK or DQS). The minimum value is equal to VIH(AC) - VIL(AC).
2. The typical value of VIX(AC) is expected to be about 0.5 x 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. Refer to Overshoot/undershoot specifications for Vpeak value: maximum peak amplitude allowed for overshoot and undershoot.
Differential signal levels
V_TR
V_CP
V_DDQ
V_ID
V_SSQ
Crossing point
V_{IX or} V_OX
Differential AC Output Parameters
Symbol Parameter
VOX (ac) ac differential crosspoint voltage
Min.
0.5 x VDDQ - 0.125
Max.
0.5 x VDDQ + 0.125
Units Notes
V1
Note:
1. The typical value of VOX(AC) is expected to be about 0.5 x 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.
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Integrated Silicon Solution, Inc. — www.issi.com
Rev. D
08/16/2012