EDBA164B4PR-1DATF-R datasheet(114/152 Pages) MICRON

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Figure 73: Single-Ended Requirements for Differential Signals

Time

DD2 or VDDQ

SS or VSSQ

DD2/2 or VDDQ/2

SEH(AC)min

SEH(AC)

SEL(AC)max

SEL(AC)

CK or DQS

While CA and DQ signal requirements are referenced to VREF, the single-ended compo-

nents of differential signals also have a requirement with respect to

VDDQ/2 for DQS, and VDD2/2 for CK.

The transition of single-ended signals through the AC levels is used to measure setup

time. For single-ended components of differential signals, the requirement to reach

VSEL(AC)max or VSEH(AC)min has no bearing on timing. This requirement does, however,

add a restriction on the common mode characteristics of these signals (see Single-

Ended AC and DC Input Levels for CA and CS_n Inputs for CK_t/CK_c single-ended re-

quirements, and Single-Ended AC and DC Input Levels for DQ and DM for DQ and

DQM single-ended requirements).

Table 73: Single-Ended Levels for CK_t, CK_c, DQS_t, DQS_c

Symbol

Parameter

LPDDR2-1066 to LPDDR2-466

LPDDR2-400 to LPDDR2-200

Unit Notes

Min

Max

Min

Max

VSEH(AC)

Single-ended HIGH

level for strobes

(VDDQ/2) + 0.220

Note 1

(VDDQ/2) + 0.300

Note 1

2, 3

Single-ended HIGH

level for CK_t, CK_c

(VDD2/2) + 0.220

Note 1

(VDD2/2) + 0.300

Note 1

2, 3

VSEL(AC)

Single-ended LOW

level for strobes

Note 1

(VDDQ/2) - 0.220

Note 1

(VDDQ/2) + 0.300

2, 3

Single-ended LOW

level for CK_t, CK_c

Note 1

(VDD2/2) - 0.220

Note 1

(VDD2/2) + 0.300

2, 3

Notes:

1. These values are not defined; however, the single-ended signals CK_t, CK_c, DQS0_t,

DQS0_c, DQS1_t, DQS1_c, DQS2_t, DQS2_c, DQS3_t, DQS3_c must be within the respec-

tive limits (VIH(DC)max/ VIL(DC)min) for single-ended signals, and must comply with the

216-Ball and 220-Ball, Dual-Channel LPDDR2 SDRAM

AC and DC Logic Input Measurement Levels for Differential

Signals

09005aef85eb530a

216b_220b_2ch_2e0e_embedded_lpddr2.pdf – Rev. F 08 /16 EN

114

Micron Technology, Inc. reserves the right to change products or specifications without notice.

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