IS62C256
AC WAVEFORMS
WRITE CYCLE NO. 2
(
OE
is HIGH During Write Cycle)
(1,2)
t
WC
ADDRESS
VALID ADDRESS
ISSI
®
t
HA
OE
CS
LOW
t
AW
t
PWE1
WE
t
SA
D
OUT
DATA UNDEFINED
t
HZWE
HIGH-Z
t
LZWE
t
SD
D
IN
t
HD
DATA
IN
VALID
CS_WR2.eps
WRITE CYCLE NO. 3
(
OE
is LOW During Write Cycle)
(1)
t
WC
ADDRESS
VALID ADDRESS
OE
CS
LOW
t
HA
LOW
t
AW
t
PWE2
WE
t
SA
D
OUT
DATA UNDEFINED
t
HZWE
HIGH-Z
t
LZWE
t
SD
D
IN
t
HD
DATA
IN
VALID
CS_WR3.eps
Notes:
1. The internal write time is defined by the overlap of
Cs
LOW and
WE
LOW. All signals must be in valid states to initiate a Write,
but any one can go inactive to terminate the Write. The Data Input Setup and Hold timing are referenced to the rising or falling
edge of the signal that terminates the write.
2. I/O will assume the High-Z state if
OE
= V
IH
.
Integrated Silicon Solution, Inc. — 1-800-379-4774
SR072-1E
05/12/99
7
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
