IS42S16800B-7TLI 查看數據表（PDF） - Integrated Silicon Solution

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IS42S16800B-7TLI

16Meg x 8, 8Meg x16 128-MBIT SYNCHRONOUS DRAM

Integrated Silicon Solution 

IS42S81600B, IS42S16800B

ISSI ®

PRECHARGE

The PRECHARGE command (see figure) is used to deac-

tivate the open row in a particular bank or the open row in all

banks. The bank(s) will be available for a subsequent row

access some specified time (tRP) after the PRECHARGE

command is issued. Input A10 determines whether one or

all banks are to be precharged, and in the case where only

one bank is to be precharged, inputs BA0, BA1 select the

bank. When all banks are to be precharged, inputs BA0,

BA1 are treated as “Don’t Care.” Once a bank has been

precharged, it is in the idle state and must be activated prior

to any READ or WRITE commands being issued to that

bank.

POWER-DOWN

Power-down occurs if CKE is registered LOW coincident

with a NOP or COMMAND INHIBIT when no accesses are

in progress. If power-down occurs when all banks are idle,

this mode is referred to as precharge power-down; if power-

down occurs when there is a row active in either bank, this

mode is referred to as active power-down. Entering power-

down deactivates the input and output buffers, excluding

CKE, for maximum power savings while in standby. The

device may not remain in the power-down state longer than

the refresh period (64ms) since no refresh operations are

performed in this mode.

The power-down state is exited by registering a NOP or

COMMAND INHIBIT and CKE HIGH at the desired clock

edge (meeting tCKS). See figure below.

PRECHARGE Command

CLK

HIGH

CKE

CS

RAS

CAS

WE

A0-A9, A11

A10

BA0, BA1

ALL BANKS

BANK SELECT

BANK ADDRESS

POWER-DOWN

CLK

tCKS

CKE

≥ tCKS

COMMAND

NOP

All banks idle

Input buffers gated off

NOP

Enter power-down mode

Exit power-down mode

ACTIVE

tRCD

tRAS

tRC

less than 64ms

DON'T CARE

46

Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774

Rev. E

05/01/06

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