®
LY61L2568
Rev. 1.0
256K X 8 BIT HIGH SPEED CMOS SRAM
REVISION HISTORY
Revision
Rev. 0.1
Rev. 0.2
Rev. 0.3
Rev. 0.4
Description
Preliminary
Deleted I
SB
Spec.
Deleted -10/-12/-15 Spec.
Revised Test Condition of I
CC
/I
SB1
/I
DR
Revised V
TERM
to V
T1
and V
T2
Revised
FEATURES
&
ORDERING INFORMATION
Lead free and green package available
to
Green package
available
Deleted T
SOLDER
in
ABSOLUTE MAXIMUN RATINGS
Added packing type in
ORDERING INFORMATION
Added I grade
Revised
ORDERING INFORMATION
in page 9
Revised Notes item 1 and 2 in page 3
1. V
IH
(max) = V
CC
+ 2.0V for pulse width less than 6ns.
2. V
IL
(min) = V
SS
- 2.0V for pulse width less than 6ns.
Issue Date
Apr.19.2006
May.24.2006
May.13.2007
Apr.17.2009
Rev. 0.5
Rev. 0.6
Rev. 1.0
Apr.27.2010
Aug.30.2010
Aug.29.2013
Added packing type in
ORDERING INFORMATION
Lyontek Inc.
reserves the rights to change the specifications and products without notice.
5F, No. 2, Industry E. Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan.
TEL: 886-3-6668838
FAX: 886-3-6668836
0
®
LY61L2568
Rev. 1.0
256K X 8 BIT HIGH SPEED CMOS SRAM
GENERAL DESCRIPTION
The LY61L2568 is a 2,097,152-bit low power CMOS
static random access memory organized as 262,144
words by 8 bits. It is fabricated using very high
performance, high reliability CMOS technology. Its
standby current is stable within the range of
operating temperature.
The LY61L2568 is well designed for very low power
system applications, and particularly well suited for
battery back-up nonvolatile memory application.
The LY61L2568 operates from a single power
supply of 3.3V and all inputs and outputs are fully
TTL compatible
FEATURES
Fast access time : 20/25ns
Very low power consumption:
Operating current(Normal version):
110/90mA(TYP.)
Operating current(20/25ns LL version):
40/35mA(TYP.)
Standby current(Normal version):
0.5mA(TYP.)
Standby current(20/25ns LL version):
10µA(TYP.)
Single 3.3V power supply
All inputs and outputs TTL compatible
Fully static operation
Tri-state output
Data retention voltage : 2.0V (MIN.)
Green package available
Package : 44-pin 400 mil TSOP-II
PRODUCT FAMILY
Product
Family
LY61L2568
LY61L2568(I)
LY61L2568(LL)
LY61L2568(LLI)
Operating
Temperature
0 ~ 70℃
-40 ~ 85℃
0 ~ 70℃
-40 ~ 85℃
Vcc Range
3.0 ~ 3.6V
3.0 ~ 3.6V
3.0 ~ 3.6V
3.0 ~ 3.6V
Speed
20/25ns
20/25ns
20/25ns
20/25ns
Power Dissipation
Standby(I
SB1,
TYP.) Operating(Icc,TYP.)
0.5mA
110/90mA
0.5mA
110/90mA
10µA(LL)
40/35mA(LL)
10µA(LL)
40/35mA(LL)
Lyontek Inc.
reserves the rights to change the specifications and products without notice.
5F, No. 2, Industry E. Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan.
TEL: 886-3-6668838
FAX: 886-3-6668836
1
®
LY61L2568
Rev. 1.0
256K X 8 BIT HIGH SPEED CMOS SRAM
PIN DESCRIPTION
SYMBOL
DESCRIPTION
Address Inputs
Data Inputs/Outputs
Chip Enable Inputs
Write Enable Input
Output Enable Input
Power Supply
Ground
No Connection
FUNCTIONAL BLOCK DIAGRAM
Vcc
Vss
A0 - A17
DQ0 – DQ7
DECODER
256Kx8
MEMORY ARRAY
CE#
WE#
OE#
V
CC
V
SS
NC
A0-A17
DQ0-DQ7
I/O DATA
CIRCUIT
COLUMN I/O
CE#
WE#
OE#
CONTROL
CIRCUIT
PIN CONFIGURATION
NC
NC
A4
A3
A2
A1
A0
CE#
DQ0
DQ1
Vcc
Vss
DQ2
DQ3
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
TSOP-II
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#
DQ7
DQ6
Vss
Vcc
DQ5
DQ4
A9
A10
A11
A12
NC
NC
NC
NC
Lyontek Inc.
reserves the rights to change the specifications and products without notice.
5F, No. 2, Industry E. Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan.
TEL: 886-3-6668838
FAX: 886-3-6668836
LY61L2568
XXXXXXX
XXXX
2
®
LY61L2568
Rev. 1.0
256K X 8 BIT HIGH SPEED CMOS SRAM
ABSOLUTE MAXIMUN RATINGS*
PARAMETER
Voltage on V
CC
relative to V
SS
Voltage on any other pin relative to V
SS
Operating Temperature
Storage Temperature
Power Dissipation
DC Output Current
SYMBOL
V
T1
V
T2
T
A
T
STG
P
D
I
OUT
RATING
-0.5 to 4.6
-0.5 to V
CC
+0.5
0 to 70(C grade)
-40 to 85(I grade)
-65 to 150
1
50
UNIT
V
V
℃
℃
W
mA
*Stresses 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 or any other conditions above those indicated in the operational sections of this
specification is not implied. Exposure to the absolute maximum rating conditions for extended period may affect device reliability.
TRUTH TABLE
MODE
Standby
Output Disable
Read
Write
Note:
CE#
H
L
L
L
OE#
X
H
L
X
WE#
X
H
H
L
I/O OPERATION
High-Z
High-Z
D
OUT
D
IN
SUPPLY CURRENT
I
SB1
I
CC
I
CC
I
CC
H = V
IH
, L = V
IL
, X = Don't care.
DC ELECTRICAL CHARACTERISTICS
SYMBOL
TEST CONDITION
PARAMETER
Supply Voltage
V
CC
*1
Input High Voltage
V
IH
*2
Input Low Voltage
V
IL
Input Leakage Current
I
LI
V
CC
≧
V
IN
≧
V
SS
Output Leakage
V
CC
≧
V
OUT
≧
V
SS
,
I
LO
Current
Output Disabled
Output High Voltage
V
OH
I
OH
= -1mA
Output Low Voltage
V
OL
I
OL
= 2mA
20
Cycle time = Min.
25
Average Operating
I
CC
CE# = V
IL
, I
I/O
= 0mA
Power supply Current
20LL
Others at V
IL
or V
IH
25LL
Normal
Standby Power
CE#
≧
V
CC
- 0.2V
I
SB1
Supply Current
Others at 0.2V or V
CC
- 0.2V 20/25LL
Notes:
1. V
IH
(max) = V
CC
+ 2.0V for pulse width less than 6ns.
2. V
IL
(min) = V
SS
- 2.0V for pulse width less than 6ns.
3. Over/Undershoot specifications are characterized, not 100% tested.
4. Typical values are included for reference only and are not guaranteed or tested.
Typical valued are measured at V
CC
= V
CC
(TYP.) and T
A
= 25℃
5. 1mA for special request
6. 20µA for special request
MIN.
3.0
2.2
- 0.3
-1
-1
2.4
-
-
-
-
-
-
-
TYP.
3.3
-
-
-
-
-
-
110
90
40
35
0.5
10
*4
MAX.
3.6
V
CC
+0.3
0.6
1
1
-
0.4
150
115
50
45
*5
5
*6
50
UNIT
V
V
V
µA
µA
V
V
mA
mA
mA
mA
mA
µA
Lyontek Inc.
reserves the rights to change the specifications and products without notice.
5F, No. 2, Industry E. Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan.
TEL: 886-3-6668838
FAX: 886-3-6668836
3
®
LY61L2568
Rev. 1.0
256K X 8 BIT HIGH SPEED CMOS SRAM
CAPACITANCE
(T
A
= 25
℃
, f = 1.0MHz)
PARAMETER
Input Capacitance
Input/Output Capacitance
SYMBOL
C
IN
C
I/O
MIN.
-
-
MAX
8
10
UNIT
pF
pF
Note : These parameters are guaranteed by device characterization, but not production tested.
AC TEST CONDITIONS
Input Pulse Levels
Input Rise and Fall Times
Input and Output Timing Reference Levels
Output Load
0.2V to V
CC
- 0.2V
3ns
1.5V
C
L
= 30pF + 1TTL, I
OH
/I
OL
= -8mA/16mA
AC ELECTRICAL CHARACTERISTICS
(1) READ CYCLE
PARAMETER
Read Cycle Time
Address Access Time
Chip Enable Access Time
Output Enable Access Time
Chip Enable to Output in Low-Z
Output Enable to Output in Low-Z
Chip Disable to Output in High-Z
Output Disable to Output in High-Z
Output Hold from Address Change
SYM.
t
RC
t
AA
t
ACE
t
OE
t
CLZ
*
t
OLZ
*
t
CHZ
*
t
OHZ
*
t
OH
LY61L2568-20
MIN.
MAX.
20
-
-
20
-
20
-
8
4
-
0
-
-
8
-
8
3
-
LY61L2568-25
MIN.
MAX.
25
-
-
25
-
25
-
9
4
-
0
-
-
9
-
9
3
-
UNIT
ns
ns
ns
ns
N`s
ns
ns
ns
ns
(2) WRITE CYCLE
PARAMETER
Write Cycle Time
Address Valid to End of Write
Chip Enable to End of Write
Address Set-up Time
Write Pulse Width
Write Recovery Time
Data to Write Time Overlap
Data Hold from End of Write Time
Output Active from End of Write
Write to Output in High-Z
SYM.
t
WC
t
AW
t
CW
t
AS
t
WP
t
WR
t
DW
t
DH
t
OW
*
t
WHZ
*
LY61L2568-20
MIN.
MAX.
20
-
16
-
16
-
0
-
11
-
0
-
9
-
0
-
5
-
-
9
LY61L2568-25
MIN.
MAX.
25
-
20
-
20
-
0
-
12
-
0
-
10
-
0
-
6
-
-
10
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
*These parameters are guaranteed by device characterization, but not production tested.
Lyontek Inc.
reserves the rights to change the specifications and products without notice.
5F, No. 2, Industry E. Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan.
TEL: 886-3-6668838
FAX: 886-3-6668836
4
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