IS62C256-70UI ISSI, Integrated Silicon Solution Inc, IS62C256-70UI Datasheet - Page 7

• Manufacturer Part Number: IS62C256-70UI
• Description: IC SRAM 256KBIT 70NS 28SOP
• Manufacturer: ISSI, Integrated Silicon Solution Inc

Specifications of IS62C256-70UI

• Format - Memory: RAM
• Memory Type: SRAM - Asynchronous
• Memory Size: 256K (32K x 8)
• Speed: 70ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AC WAVEFORMS
WRITE CYCLE NO. 2
WRITE CYCLE NO. 3
IS62C256
Notes:
1. The internal write time is defined by the overlap of
2. I/O will assume the High-Z state if
Integrated Silicon Solution, Inc. — 1-800-379-4774
SR072-1E
05/12/99
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.
ADDRESS
ADDRESS
D
D
OUT
WE
D
OE
CS
OUT
WE
D
OE
IN
CS
IN
LOW
LOW
LOW
t
SA
(
(
DATA UNDEFINED
OE
OE
t
DATA UNDEFINED
SA
is HIGH During Write Cycle)
is LOW During Write Cycle)
OE
= V
IH
.
VALID ADDRESS
t
t
Cs
AW
t
t
HZWE
AW
HZWE
LOW and
VALID ADDRESS
t
t
PWE1
WC
t
t
PWE2
WC
(1)
(1,2)
WE
HIGH-Z
HIGH-Z
LOW. All signals must be in valid states to initiate a Write,
t
SD
t
DATA
SD
DATA
IN
IN
VALID
VALID
t
HD
t
t
HD
LZWE
t
LZWE
t
HA
t
HA
CS_WR2.eps
CS_WR3.eps
ISSI
®
7