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AC Overshoot/Undershoot Specification (DDR2 SDRAM Component Specification)
Parameter
Pins
Specification
Unit
V
Command, Address,
CKE, ODT
Maximum peak amplitude allowed for overshoot
Maximum peak amplitude allowed for undershoot
0.5
0.5
V
Maximum overshoot area above VDD
DDR2-800
0.66
0.8
V-ns
V-ns
V-ns
DDR2-667
Maximum undershoot area below VSS
DDR2-800
0.66
DDR2-667
0.8
0.5
0.5
V-ns
V
Maximum peak amplitude allowed for overshoot
Maximum peak amplitude allowed for undershoot
CK, /CK
V
Maximum overshoot area above VDD
DDR2-800, 667
0.23
V-ns
Maximum undershoot area below VSS
DDR2-800, 667
0.23
0.5
V-ns
V
Maximum peak amplitude allowed for overshoot
DQ, DQS, /DQS,
UDQS, /UDQS,
LDQS, /LDQS,
Maximum peak amplitude allowed for undershoot
0.5
V
Maximum overshoot area above VDDQ
DDR2-800, 667
RDQS, /RDQS,
DM, UDM, LDM
0.23
0.23
V-ns
V-ns
Maximum undershoot area below VSSQ
DDR2-800, 667
Maximum amplitude
Overshoot area
VDD, VDDQ
Volts (V)
VSS, VSSQ
Undershoot area
Time (ns)
Overshoot/Undershoot Definition
Data Sheet E1083E20 (Ver. 2.0)
10
ELPIDA [ ELPIDA MEMORY ]
