IC41C16257 Datasheet, PDF (4/20 Pages) Integrated Circuit Solution Inc – 256K x 16 (4-MBIT) DYNAMIC RAM WITH FAST PAGE MODE

IC41C16257/IC41C16257S
IC41LV16257/IC41LV16257S
TRUTH TABLE
Function
Standby
Read: Word
Read: Lower Byte
RAS
H
L
L
LCAS UCAS WE
H
H
X
L
L
H
L
H
H
OE Address tR/tC
X
X
L ROW/COL
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 Circuit Solution Inc.
DR021-0A 08/11/2001