MT49H8M36 datasheet(11/49 Pages) MICRON

Part #	MT49H8M36

Description	288Mb CIO Reduced Latency

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Manufacturer	MICRON [Micron Technology]

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

MT49H8M36_2.fm - Rev. H 8/05 EN

11

288Mb: x36, x18, x9 2.5V VEXT, 1.8V VDD, HSTL, RLDRAM II

Commands

According to the functional signal description, the following command sequences are

possible. All input states or sequences not shown are illegal or reserved. All command

and address inputs must meet setup and hold times around the rising edge of CK.

Notes: 1. X = “Don’t Care”

H = logic HIGH

L = logic LOW

A = valid address

BA = valid bank address.

2. Only A(17:0) are used for the MRS command.

3. See Table 6.

VDDQ

Supply

DQ power supply: Nominally, 1.5V or 1.8V. Isolated on the device for improved noise

immunity. See Table 22 on page 44 for range.

VSS

Supply

Ground.

VSSQ

Supply

DQ ground: Isolated on the device for improved noise immunity.

VTT

Supply

Power supply: Isolated termination supply. Nominally, VDDQ/2. See Table 22 on page 44 for

range.

NF

–

No function: These balls may be connected to ground.

DNU

–

Do not use: These balls may be connected to ground.

Table 6:

Address Widths at Different Burst Lengths

Burst Length

Configuration

x36

x18

x9

BL = 2

18:0

19:0

20:0

BL = 4

17:0

18:0

19:0

BL = 8

NA

17:0

18:0

Table 7:

Command Table

Note 1

Operation

Code

CS#

WE#

REF#

A[20:0]

B[2:0]

Notes

Device DESELECT/No Operation

DESEL/NOP

H

XXXX

MRS: Mode Register Set

MRS

LLL

OPCODE

X

2

READ

L

H

A

BA

3

WRITE

L

H

A

BA

3

AUTO REFRESH

AREF

L

H

L

X

BA

Table 5:

Ball Descriptions (continued)

Symbol

Type

Description

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