IS41LV16257C-35TLI Ver la hoja de datos (PDF) - Integrated Silicon Solution

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IS41LV16257C-35TLI

256Kx16 4Mb DRAM WITH FAST PAGE MODE

Integrated Silicon Solution 

IS41C16257C

IS41LV16257C

TRUTH TABLE

Function

Standby

Read: Word

Read: Lower Byte

RAS LCAS UCAS WE OE Address tr/tc

H

H

H

X

X

X

L

L

L

H

L

ROW/COL

L

L

H

H

L

ROW/COL

Read: Upper Byte

L

H

L

H

L

ROW/COL

Write: Word (Early Write)

Write: Lower Byte (Early Write)

L

L

L

L

X ROW/COL

L

L

H

L

X ROW/COL

Write: Upper Byte (Early Write)

L

H

L

L

X ROW/COL

Read-Write(1,2)

L

L

L H → L L → H ROW/COL

Hidden Refresh2)

RAS-Only Refresh

Read  L → H → L L

L

H

L

ROW/COL

Write  L → H → L L

L

L

X ROW/COL

L

H

H

X

X

ROW/NA

CBR Refresh(3)

H→L

L

L

X

X

X

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).

I/O

High-Z

Dout

Lower Byte, Dout

Upper Byte, High-Z

Lower Byte, High-Z

Upper Byte, Dout

Din

Lower Byte, Din

Upper Byte, High-Z

Lower Byte, High-Z

Upper Byte, Din

Dout, Din

Dout

Dout

High-Z

High-Z

4

Integrated Silicon Solution, Inc.

Rev.  00A

04/09/2010

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