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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
AC and DC Logic Input Measurement Levels for Differential
Signals
2. For CK and CK#, use V SEH /V SEL(AC) of CA; for strobes (DQS[3:0] and DQS#[3:0]), use
V IH /V IL(AC) of DQ.
3. V IH(AC) and V IL(AC) for DQ are based on V REFDQ ; V SEH(AC) and V SEL(AC) for CA are based on
V REFCA . If a reduced AC HIGH or AC LOW is used for a signal group, the reduced level
applies.
Differential Input Crosspoint Voltage
To ensure tight setup and hold times as well as output skew parameters with respect to
clock and strobe, each crosspoint voltage of differential input signals (CK, CK#, DQS,
and DQS#) must meet the specifications in Table 68 (page 125). The differential input
crosspoint voltage ( V IX ) is measured from the actual crosspoint of the true signal and its
and complement to the midlevel between V DD and V SS .
Figure 87: V IX Definition
V DDCA , V DDQ
CK#, DQS#
V IX
X
V DDCA , V DDQ
CK#, DQS#
V IX
V DDCA /2,
V DDQ /2
X
X
V DDCA /2,
V DDQ /2
V IX
X
CK, DQS
V SSCA , V SSQ
Table 69: Crosspoint Voltage for Differential Input Signals (CK, CK#, DQS, DQS#)
LPDDR2-1066 to LPDDR2-200
V IX
CK, DQS
V SSCA , V SSQ
Symbol
V IXCA(AC)
Parameter
Differential input crosspoint voltage rela-
Min
–120
Max
120
Unit
mV
Notes
1, 2
tive to V DDCA /2 for CK and CK#
V IXDQ(AC)
Differential input crosspoint voltage rela-
–120
120
mV
1, 2
tive to V DDQ /2 for DQS and DQ#
Notes:
1. The typical value of V IX(AC) is expected to be about 0.5 × V DD of the transmitting device,
and it is expected to track variations in V DD . V IX(AC) indicates the voltage at which differ-
ential input signals must cross.
2. For CK and CK#, V REF = V REFCA(DC) . For DQS and DQS#, V REF = V REFDQ(DC) .
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
126
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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