IS41LV16257-35KI datasheet(3/17 Pages) ISSI

Part #	IS41LV16257-35KI

Description	256K x 16 (4-MBIT) DYNAMIC RAM WITH FAST PAGE MODE

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

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IS41C16257

IS41LV16257

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

3

DR004-1B

05/24/99

ISSI®

TRUTH TABLE

Function

RAS

LCAS

LCAS UCAS

UCAS

WE

OE

Address tR/tC

I/O

Standby

H

X

High-Z

Read: Word

L

H

L

ROW/COL

DOUT

Read: Lower Byte

L

H

L

ROW/COL

Lower Byte, DOUT

Upper Byte, High-Z

Read: Upper Byte

L

H

L

H

L

ROW/COL

Lower Byte, High-Z

Upper Byte, DOUT

Write: Word (Early Write)

L

X

ROW/COL

DIN

Write: Lower Byte (Early Write)

L

H

L

X

ROW/COL

Lower Byte, DIN

Upper Byte, High-Z

Write: Upper Byte (Early Write)

L

H

L

X

ROW/COL

Lower Byte, High-Z

Upper Byte, DIN

Read-Write(1,2)

LL

L

H

→LL→H

ROW/COL

DOUT, DIN

Hidden Refresh2)

Read L

→H→L

L

H

L

ROW/COL

DOUT

Write L

→H→L

LLL

X

ROW/COL

DOUT

RAS-Only Refresh

L

H

X

ROW/NA

High-Z

CBR Refresh(3)

H

→L

L

X

High-Z

Notes:

1. These WRITE cycles may also be BYTE WRITE cycles (either

LCAS or UCAS active).

2. These READ cycles may also be BYTE READ cycles (either

LCAS or UCAS active).

3. At least one of the two CAS signals must be active (

LCAS or UCAS).

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IS41LV16257-35KI Datasheet(PDF) 3 Page - Integrated Silicon Solution, Inc

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