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AC Overshoot/Undershoot Specification
Some revisions will support the 0.9V maximum average amplitude instead of the 0.5V
Table 25: Address and Control Balls
Applies to address balls, bank address balls, CS#, RAS#, CAS#, WE#, CKE, and ODT
Parameter
Specification
-187E
-25/-25E
-3/-3E
-37E
-5E
Maximum peak amplitude allowed for overshoot area
0.50V
Maximum peak amplitude allowed for undershoot area
0.50V
0.5 V/ns
0.66 V/ns
0.80 V/ns
1.00 V/ns 1.33 V/ns
Maximum undershoot area below Vss (see
Figure 250.5 V/ns
0.66 V/ns
0.80 V/ns
1.00 V/ns 1.33 V/ns
Table 26: Clock, Data, Strobe, and Mask Balls
Applies to DQ, DQS, DQS#, RDQS, RDQS#, UDQS, UDQS#, LDQS, LDQS#, DM, UDM, and LDM
Parameter
Specification
-187E
-25/-25E
-3/-3E
-37E
-5E
Maximum peak amplitude allowed for overshoot area
0.50V
Maximum peak amplitude allowed for undershoot area
0.50V
Maximum overshoot area above VddQ (see
Figure 240.19 V/ns
0.23 V/ns
0.28 V/ns 0.38 V/ns
Maximum undershoot area below VssQ (see
Figure 250.19 V/ns
0.23 V/ns
0.28 V/ns 0.38 V/ns
Figure 24: Overshoot
Maximum amplitude
Overshoot area
Vdd/VddQ
Vss/VssQ
V
olts
(V)
Time (ns)
Figure 25: Undershoot
Vss/VssQ
Maximum amplitude
Undershoot area
Time (ns)
V
olts
(V)
512Mb: x4, x8, x16 DDR2 SDRAM
AC Overshoot/Undershoot Specification
PDF: 09005aef82f1e6e2
Rev. M 9/08 EN
58
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2004 Micron Technology, Inc. All rights reserved.