IS61C256AL-12TLI-TR ISSI, Integrated Silicon Solution Inc, IS61C256AL-12TLI-TR Datasheet - Page 6

• Manufacturer Part Number: IS61C256AL-12TLI-TR
• Description: IC SRAM 256KBIT 12NS 28TSOP
• Manufacturer: ISSI, Integrated Silicon Solution Inc

Specifications of IS61C256AL-12TLI-TR

• Format - Memory: RAM
• Memory Type: SRAM - Asynchronous
• Memory Size: 256K (32K x 8)
• Speed: 12ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-TSOP
• Density: 256Kb
• Access Time (max): 12ns
• Sync/async: Asynchronous
• Architecture: Not Required
• Clock Freq (max): Not RequiredMHz
• Operating Supply Voltage (typ): 5V
• Address Bus: 15b
• Package Type: TSOP-I
• Operating Temp Range: -40C to 85C
• Number Of Ports: 1
• Supply Current: 25mA
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Word Size: 8b
• Number Of Words: 32K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant

IS61C256AL
WRITE CYCLE SWITCHING CHARACTERISTICS
Notes:
1. Test conditions assume signal transition times of 3 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V and
2. Tested with the load in Figure 2. Transition is measured ±500 mV from steady-state voltage. Not 100% tested.
3. The internal write time is defined by the overlap of CE LOW and WE LOW. All signals must be in valid states to initiate a Write,
AC WAVEFORMS
WRITE CYCLE NO. 1 (WE
6
ADDRESS
Symbol
output loading specified in Figure 1.
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.
t
t
t
t
t
t
t
t
t
t
t
WC
SCS
AW
HA
SA
PWE
PWE
SD
HD
HZWE
LZWE
D
1
2
OUT
WE
D
(2)
(2)
CE
IN
Parameter
Write Cycle Time
CE to Write End
Address Setup Time
to Write End
Address Hold
from Write End
Address Setup Time
WE Pulse Width (OE LOW)
WE Pulse Width (OE HIGH)
Data Setup to Write End
Data Hold from Write End
WE LOW to High-Z Output
WE HIGH to Low-Z Output
DATA UNDEFINED
t
SA
WE
WE
WE
WE Controlled)
(1,2)
Integrated Silicon Solution, Inc. — www.issi.com —
t
HZWE
t
VALID ADDRESS
AW
t
t
Min.
PWE1
PWE2
10
—
9
9
0
0
9
8
7
0
0
-10 ns
t
t
SCS
WC
(1,3)
Max
HIGH-Z
—
—
—
—
—
—
—
—
—
—
6
(Over Operating Range)
t
SD
DATA
Min. Max.
12
10
10
—
IN
0
0
9
8
7
0
0
-12 ns
VALID
—
—
—
—
—
—
—
—
—
—
6
t
HD
t
LZWE
t
HA
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ISSI
1-800-379-4774
CE_WR1.eps
10/23/06
Rev. B
®