EDB8164B4PR-1DITF-R datasheet(108/152 Pages) MICRON

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Table 70: Single-Ended AC and DC Input Levels for DQ and DM

Symbol

Parameter

LPDDR2-1066 to LPDDR2-466

LPDDR2-400 to LPDDR2-200

Unit

Notes

Min

Max

Min

Max

VIHDQ(AC)

AC input logic HIGH

VREF + 0.220

Note 2

VREF + 0.300

Note 2

1, 2

VILDQ(AC)

AC input logic LOW

Note 2

VREF - 0.220

Note 2

VREF - 0.300

1, 2

VIHDQ(DC)

DC input logic HIGH

VREF + 0.130

VDDQ

VREF + 0.200

VDDQ

VILDQ(DC)

DC input logic LOW

VSS

VREF - 0.130

VSS

VREF - 0.200

VREFDQ(DC)

Reference voltage for

DQ and DM inputs

0.49 × VDDQ

0.51 × VDDQ

0.49 × VDDQ

0.51 × VDDQ

3, 4

Notes:

1. For DQ input-only pins. VREF = VREFDQ(DC).

2. See Overshoot and Undershoot Definition.

3. The AC peak noise on VREFDQ could prevent VREFDQ from deviating more than ±1% VDDQ

from VREFDQ(DC) (for reference, approximately ±12mV).

4. For reference, approximately. VDDQ/2 ±12mV.

VREF Tolerances

The DC tolerance limits and AC noise limits for the reference voltages VREFCA and

VREFDQ are illustrated below. This figure shows a valid reference voltage VREF(t) as a

function of time. VDD is used in place of VDD2 for VREFCA, and VDDQ for VREFDQ. VREF(DC)

is the linear average of VREF(t) over a very long period of time (for example, 1 second)

and is specified as a fraction of the linear average of VDDQ or VDD2, also over a very long

period of time (for example, 1 second). This average must meet the MIN/MAX require-

ments in the Single-Ended AC and DC Input Levels for CA and CS_n Inputs table. Addi-

tionally, VREF(t) can temporarily deviate from VREF(DC) by no more than ±1% VDD. VREF(t)

cannot track noise on VDDQ or VDD2 if doing so would force VREF outside these specifica-

tions.

Figure 69: VREF DC Tolerance and VREF AC Noise Limits

REF(DC)

REF(DC)max

DD/2

REF(DC)min

Time

REF(AC) noise

REF(t)

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

AC and DC Logic Input Measurement Levels for Single-Ended

Signals

09005aef85eb530a

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

108

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

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