AS4C64M32MD2-25BCN datasheet(78/129 Pages) ALSC

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AC and DC Input Measurement Levels

7.1 AC and DC Logic Input Levels for Single-Ended Signals

7.1.1

AC and DC Input Levels for Single-Ended CA and CS# Signals

Table 23 — Single-Ended AC and DC Input Levels for CA and CS# Inputs

Symbol

Parameter

LPDDR2-800

Unit

Notes

Min

Max

VIHCA(AC)

AC input logic high

Vref +0.220

Note 2

1,2

VILCA(AC)

AC input logic low

Note 2

Vref - 0.220

1,2

VIHCA(DC)

DC input logic high

Vref + 0.130

VDDCA

VILCA(DC)

DC input logic low

VSSCA

Vref -0.130

VrefCA(DC)

Reference Voltage for CA and CS# inputs

0.49 * VDDCA

0.51 * VDDCA

3,4

NOTE 1 For CA and CS# input only pins Vref = VrefCA(DC)

NOTE 2 see 8.5 Overshoot and Undershoot Specifications.

NOTE 3 The ac peak noise on VrefCA may not allow VrefCA to deviate from VrefCA(DC) by more than ± 1% VDDCA (for reference : approx.

±12mV)

NOTE 4 For reference : approx. VDDCA/2 ±12mV

7.1.2

AC and DC Input Levels for CKE

Table 24 — Single-Ended AC and DC Input Levels for CKE

Symbol

Parameter

Min

Max

Unit

Notes

VIHCKE

CKE INPUT HIGH LEVEL

0.8* VDDCA

Note 1

VILCKE

CKE INPUT LOW LEVEL

Note 1

0.2 * VDDCA

NOTE 1 See 8.5 Overshoot and Undershoot Specifications.

7.1.3

AC and DC Input Levels for Single-Ended Data Signals

Table 25 — Single-Ended AC and DC Input Levels for DQ and DM

Symbol

Parameter

LPDDR2-1066 to LPDDR2-466

Unit

Notes

Min

Max

VIHDQ(AC)

AC input logic high

Vref +0.220

Note 2

1,2

VILDQ(AC)

AC input logic low

Note 2

Vref - 0.220

1,2

VIHDQ(DC)

DC input logic high

Vref + 0.130

VDDQ

VILDQ(DC)

DC input logic low

VSSQ

Vref -0.130

VrefDQ(DC)

Reference Voltage for DQ , DM inputs

0.49 * VDDQ

0.51 * VDDQ

3,4

NOTE 1 For DQ input only pins Vref = VrefDQ(DC)

NOTE 2 see 8.5 Overshoot and Undershoot Specifications.

NOTE 3 The ac peak noise on VrefDQ may not allow VrefDQ to deviate from VrefDQ(DC) by more than ± 1% VDDQ (for reference : approx.

±12mV)

NOTE 4 For reference : approx. VDDDQ/2 ±12mV

AS4C64M32MD2-25BCN

AS4C128M16MD2-25BCN

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Rev.1.0 July 2016

AS4C64M32MD2-25BCN Datasheet(PDF) 78 Page - Alliance Semiconductor Corporation

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