IS61LV2568
FEATURES
256K x 8 HIGH-SPEED CMOS STATIC RAM
High-speed access times:
8, 10, 12 and 15 ns
High-preformance, lower-power CMOS process
Multiple center power and ground pins for
greater noise immunity
Easy memory expansion with
CE
and
OE
options
CE
power-down
CMOS power: 540 mW @ 10 ns
36 mW standby mode
TTL compatible inputs and outputs
Single 3.3V + 10% power supply
Packages available:
36-pin 400mil SOJ
44-pin TSOP-2
262,144-word by 8-bit COMS static RAM. The IS61LV2568 is
fabricated using
1+51
's high-performance CMOS technology.
This highly reliable process coupled with innovative circuit
design techniques, yields higher preformance and low power
consumotion devices.
When
CE
is HIGH (deselected), the device assumes a standby
mode at which the power dissipation can be reduced down to
36 mW (max.) with CMOS input levels.
The IS61LV2568 operates from a single 3.3V power supply
and all inputs are TTL-compatible.
The IS61LV2568 is available in 36-pin, 400mil SOJ and 44-pin
TSOP-2 package.
DESCRIPTION
The
1+51
IS61LV2568 is a very high-speed, low power,
FUNCTIONAL BLOCK DIAGRAM
A0-A17
DECODER
256K X 8
MEMORY ARRAY
VCC
GND
I/O
DATA
CIRCUIT
I/O0-I/O7
COLUMN I/O
CE
OE
WE
CONTROL
CIRCUIT
ICSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors
which may appear in this publication. © Copyright 2000, Integrated Circuit Solution, Inc.
Integrated Circuit Solution, Inc.
SR026-0C
1
IS61LV2568
PIN CONFIGURATION
36-Pin SOJ
A4
A3
A2
A1
A0
CE
I/O0
I/O1
Vcc
GND
I/O2
I/O3
WE
A17
A16
A15
A14
A13
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
NC
A5
A6
A7
A8
OE
I/O7
I/O6
GND
Vcc
I/O5
I/O4
A9
A10
A11
A12
NC
NC
PIN CONFIGURATION
44-Pin TSOP-2
NC
NC
A4
A3
A2
A1
A0
CE
I/O0
I/O1
Vcc
GND
I/O2
I/O3
WE
A17
A16
A15
A14
A13
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
NC
NC
NC
A5
A6
A7
A8
OE
I/O7
I/O6
GND
Vcc
I/O5
I/O4
A9
A10
A11
A12
NC
NC
NC
NC
PIN DESCRIPTIONS
A0-A17
CE
OE
WE
I/O0-I/O7
Vcc
GND
NC
Address Inputs
Chip Enable Input
Output Enable Input
Write Enable Input
Input/Output
Power
Ground
No Connection
TRUTH TABLE
Mode
Not Selected
(Power-down)
Output Disabled
Read
Write
WE
X
H
H
L
CE
H
L
L
L
OE
X
H
L
X
I/O Operation
High-Z
High-Z
D
OUT
D
IN
Vcc Current
I
SB
, I
SB
I
CC
I
CC
I
CC
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
TERM
T
BIAS
T
STG
P
D
I
OUT
Parameter
Power Supply Voltage Relative to GND
Terminal Voltage with Respect to GND
Temperature Under Bias
Storage Temperature
Power Dissipation
DC Output Current
Value
Unit
0.5 to +4.6
V
0.5 to Vcc + 0.5 V
10 to +85
°C
45 to +90
65 to +150
°C
1
W
±20
mA
Com.
Ind.
Notes:
1. Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operational sections of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect reliability.
2
Integrated Circuit Solution, Inc.
SR026-0C
IS61LV2568
OPERATING RANGE
Range
Commercial
Industrial
Ambient Temperature
0°C to +70°C
40°C to +85°C
V
CC
3.3V + 10%
3.3V + 10%
DC ELECTRICAL CHARACTERISTICS
(Over Operating Range)
Symbol
V
OH
V
OL
V
IH
V
IL
I
LI
I
LO
Parameter
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Input Leakage
Output Leakage
GND
≤
V
IN
≤
V
CC
GND
≤
V
OUT
≤
V
CC
, Outputs Disabled
Com.
Ind.
Com.
Ind.
Test Conditions
V
CC
= Min., I
OH
= 4.0 mA
V
CC
= Min., I
OL
= 8.0 mA
Min.
2.4
2.0
0.3
1
5
1
5
Max.
0.4
V
CC
+ 0.3
0.8
1
5
1
5
Unit
V
V
V
V
µA
µA
Notes:
1. V
IL
(min.) = 0.3V (DC); V
IL
(min.) = 2.0V (pulse width
≤
2.0 ns).
V
IH
(max.) = V
CC
+ 0.3V (DC); V
IH
(max.) = Vcc + 2.0V (pulse width
≤
2.0 ns).
2. The Vcc operating range for 8 ns is 3.3V +10%, -5%.
POWER SUPPLY CHARACTERISTICS
(1)
(Over Operating Range)
Sym.
I
CC
I
SB
Parameter
Test Conditions
Com.
Ind.
Com.
Ind.
Com.
Ind.
-8 ns
Min.
Max.
-10 ns
Min.
Max.
-12 ns
Min.
Max.
-15 ns
Min.
Max.
Unit
Vcc Dynamic Operating V
CC
= Max.,
CE
= V
IL
Supply Current
I
OUT
= 0 mA, f = f
MAX
TTL Standby Current
(TTL Inputs)
V
CC
= Max.,
V
IN
= V
IH
or V
IL
CE
≥
V
IH
, f = 0
170
180
30
40
10
15
150
160
30
40
10
15
140
150
30
40
10
15
130
140
30
40
10
15
mA
mA
I
SB
CMOS Standby
V
CC
= Max.,
Current (CMOS Inputs)
CE
≤
V
CC
0.2V,
V
IN
> V
CC
0.2V, or
V
IN
≤
0.2V, f = 0
mA
Notes:
1. At f = f
MAX
, address and data inputs are cycling at the maximum frequency, f = 0 means no input lines change.
CAPACITANCE
(1,2)
Symbol
C
IN
C
OUT
Parameter
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Max.
6
8
Unit
pF
pF
Notes:
1. Tested initially and after any design or process changes that may affect these parameters.
2. Test conditions: T
A
= 25°C, f = 1 MHz, Vcc = 3.3V.
Integrated Circuit Solution, Inc.
SR026-0C
3
IS61LV2568
READ CYCLE SWITCHING CHARACTERISTICS
(1)
(Over Operating Range)
Symbol
Parameter
Read Cycle Time
Address Access Time
Output Hold Time
CE
Access Time
OE
Access Time
Min. Max.
-8 ns
Min. Max.
-10 ns
Min. Max.
-12 ns
Min. Max.
-15 ns
Unit
t
RC
t
AA
t
OHA
t
ACE
t
DOE
8
3
0
0
3
0
8
8
3
3
3
10
3
0
0
3
0
10
10
4
4
4
12
3
0
0
3
0
12
12
5
5
5
15
3
0
0
3
0
15
15
6
6
6
ns
ns
ns
ns
ns
ns
ns
ns
ns
t
LZOE
OE
to Low-Z Output
t
HZOE
OE
to High-Z Output
t
LZCE
CE
to Low-Z Output
t
HZCE
CE
to High-Z Output
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 output loading specified in Figure 1.
2. Tested with the load in Figure 2. Transition is measured ±200 mV from steady-state voltage. Not
100% tested.
AC TEST CONDITIONS
Parameter
Input Pulse Level
Input Rise and Fall Times
Input and Output Timing
and Reference Levels
Output Load
Unit
0V to 3.0V
3 ns
1.5V
See Figures 1 and 2
Notes:
1. The Vcc operating range for 8 ns is 3.3V +10%, -5%.
AC TEST LOADS
319
Ω
3.3V
3.3V
319
Ω
OUTPUT
30 pF
Including
jig and
scope
353
Ω
OUTPUT
5 pF
Including
jig and
scope
353
Ω
Figure 1.
4
Figure 2.
Integrated Circuit Solution, Inc.
SR026-0C
IS61LV2568
AC WAVEFORMS
READ CYCLE NO. 1
(1,2)
t
RC
ADDRESS
t
AA
t
OHA
D
OUT
PREVIOUS DATA VALID
t
OHA
DATA VALID
READ CYCLE NO. 2
(1,3)
t
RC
ADDRESS
t
AA
OE
t
OHA
t
DOE
CE
t
HZOE
t
LZOE
t
ACE
t
LZCE
t
HZCE
DATA VALID
D
OUT
HIGH-Z
Notes:
1.
WE
is HIGH for a Read Cycle.
2. The device is continuously selected.
OE, CE
= V
IL
.
3. Address is valid prior to or coincident with
CE
LOW transitions.
Integrated Circuit Solution, Inc.
SR026-0C
5
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