is43dr16320b Lattice Semiconductor Corp., is43dr16320b Datasheet - Page 17

• Manufacturer Part Number: is43dr16320b
• Description: 512mb X8, X16 Ddr2 Sdram
• Manufacturer: Lattice Semiconductor Corp.

IS43/46DR86400B, IS43/46DR16320B
Differential Signal Level Waveform
Differential AC Output Parameters
Note: 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.
Overshoot and Undershoot Specification
AC Overshoot and Undershoot Specification for Address and Control Pins
Note: Please refer to AC Overshoot and Undershoot Definition Diagram.
AC Overshoot and Undershoot Specification for Clock, Data, Strobe and Mask Pins
Note: Please refer to AC Overshoot and Undershoot Definition Diagram.
AC Overshoot and Undershoot Definition Diagram
Integrated Silicon Solution, Inc. – www.issi.com –
Rev. E, 01/17/2011
Maximum peak amplitude allowed for undershoot area
Maximum peak amplitude allowed for undershoot area
Maximum peak amplitude allowed for overshoot area
Maximum peak amplitude allowed for overshoot area
VOX(AC)
Symbol
Maximum undershoot area below VSSQ*
Maximum overshoot area above VDDQ*
Maximum undershoot area below VSS*
Maximum overshoot area above VDD*
Parameter
Parameter
AC differential crosspoint voltage
Parameter
DDR2-400
DDR2-400
1.33
1.33
0.38
0.38
0.9
0.9
0.9
0.9
0.5 x VDDQ-0.125
Min.
DDR2-533
DDR2-533
1.00
1.00
0.28
0.28
0.9
0.9
0.9
0.9
0.5 x VDDQ+0.125
DDR2-667
DDR2-667
0.80
0.80
0.23
0.23
0.9
0.9
0.9
0.9
Max.
DDR2-800
DDR2-800
0.66
0.66
0.18
0.18
0.9
0.9
0.9
0.9
Units
V
Unit
V-ns
V-ns
Unit
V-ns
V-ns
17
V
V
V
V