ISSI IS61LV2568 256k x 8 high-speed cmos static ram Datasheet

ISSI
IS61LV2568
256K x 8 HIGH-SPEED CMOS STATIC RAM
FEATURES
• High-speed access times: 10 and 12 ns
• High-performance, low-power CMOS process
• Multiple center power and ground pins for
greater noise immunity
• Easy memory expansion with CE and OE
options
• CE power-down
• Low power: 540 mW @ 10 ns
36 mW standby mode
• TTL compatible inputs and outputs
• Single 3.3V ±10% power supply
• Packages available:
– 36-pin 400-mil SOJ
– 44-pin TSOP (Type II)
®
FEBRUARY 2003
DESCRIPTION
The ISSI IS61LV2568 is a very high-speed, low power,
262,144-word by 8-bit CMOS static RAM. The IS61LV2568
is fabricated using ISSI's high-performance CMOS technology. This highly reliable process coupled with innovative circuit design techniques, yields higher performance
and low power consumption devices.
When CE is HIGH (deselected), the device assumes a
standby mode at which the power dissipation can be
reduced down to 36mW (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 400-mil SOJ, and
44-pin TSOP (Type II) packages.
FUNCTIONAL BLOCK DIAGRAM
A0-A17
DECODER
256K X 8
MEMORY ARRAY
I/O
DATA
CIRCUIT
COLUMN I/O
VDD
GND
I/O0-I/O7
CE
OE
CONTROL
CIRCUIT
WE
Copyright © 2003 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time
without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to
obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
1
ISSI
IS61LV2568
®
PIN CONFIGURATION
36-Pin SOJ
44-Pin TSOP (Type II)
A4
1
36
NC
A3
2
35
A5
A2
3
34
A6
A1
4
33
A7
A0
5
32
A8
CE
6
31
OE
I/O0
7
30
I/O7
I/O1
8
29
I/O6
VDD
9
28
GND
GND
10
27
VDD
I/O2
11
26
I/O5
I/O3
12
25
I/O4
WE
13
24
A9
A17
14
23
A10
A16
15
22
A11
A15
16
21
A12
A14
17
20
NC
A13
18
19
NC
NC
NC
A4
A3
A2
A1
A0
CE
I/O0
I/O1
VDD
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
VDD
I/O5
I/O4
A9
A10
A11
A12
NC
NC
NC
NC
PIN DESCRIPTIONS
A0-A17
Address Inputs
CE
Chip Enable Input
OE
Output Enable Input
WE
Write Enable Input
I/O0-I/O7
Bidirectional Ports
VDD
Power
GND
Ground
NC
No Connection
2
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
ISSI
IS61LV2568
TRUTH TABLE
WE
Mode
Not Selected
(Power-down)
Output Disabled
Read
Write
CE
OE
I/O Operation
VDD Current
X
H
X
High-Z
ISB1, ISB2
H
H
L
L
L
L
H
L
X
High-Z
DOUT
DIN
ICC
ICC
ICC
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
VDD
VTERM
TSTG
PD
Parameter
Supply voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
Power Dissipation
Value
–0.5 to +4.6
–0.5 to VDD + 0.5
–65 to +150
1.0
Unit
V
V
°C
W
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.
OPERATING RANGE
Range
Commercial
Industrial
Ambient Temperature
0°C to +70°C
–40°C to +85°C
VDD
3.3V ± 10%
3.3V ± 10%
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
3
®
ISSI
IS61LV2568
®
DC ELECTRICAL CHARACTERISTICS (Over Operating Range)
Symbol Parameter
Test Conditions
Min.
Max.
Unit
VOH
Output HIGH Voltage
VDD = Min., IOH = –4.0 mA
2.4
—
V
VOL
Output LOW Voltage
VDD = Min., IOL = 8.0 mA
—
0.4
V
VIH
Input HIGH Voltage(1)
2.0
VDD + 0.3
V
–0.3
0.8
V
(1)
VIL
Input LOW Voltage
ILI
Input Leakage
GND ≤ VIN ≤ VDD
Com.
Ind.
–1
–5
1
5
µA
ILO
Output Leakage
GND ≤ VOUT ≤ VDD, Outputs Disabled
Com.
Ind.
–1
–5
1
5
µA
Note:
1. VIL(min) = –0.3V (DC); VIL(min) = –2.0V (pulse width - 2.0 ns).
VIH(max) = VDD + 0.3V (DC); VIH(max) = VDD + 2.0V (pulse width - 2.0 ns).
POWER SUPPLY CHARACTERISTICS(1) (Over Operating Range)
-10 ns
Symbol
-12 ns
Parameter
Test Conditions
Min. Max.
Min. Max.
Unit
ICC
VDD Operating
Supply Current
VDD = Max., CE = VIL
IOUT = 0 mA, f = Max.
Com.
Ind.
—
—
125
135
—
—
110
120
mA
ISB1
TTL Standby
Current
(TTL Inputs)
VDD = Max.,
VIN = VIH or VIL
CE ≥ VIH, f = max
Com.
Ind.
—
—
40
50
—
—
35
45
mA
ISB2
CMOS Standby
Current
(CMOS Inputs)
VDD = Max.,
CE ≥ VDD – 0.2V,
VIN ≥ VDD – 0.2V, or
VIN ≤ 0.2V, f = 0
Com.
Ind.
—
—
10
20
—
—
10
20
mA
Note:
1. At f = fMAX, address and data inputs are cycling at the maximum frequency, f = 0 means no input lines change.
CAPACITANCE(1,2)
Symbol
Parameter
CIN
Input Capacitance
CI/O
Input/Output Capacitance
Conditions
Max.
Unit
VIN = 0V
6
pF
VOUT = 0V
8
pF
Notes:
1. Tested initially and after any design or process changes that may affect these parameters.
2. Test conditions: TA = 25°C, f = 1 MHz, VDD = 3.3V.
4
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
ISSI
IS61LV2568
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
AC TEST LOADS
319 Ω
319 Ω
3.3V
3.3V
OUTPUT
OUTPUT
30 pF
Including
jig and
scope
353 Ω
5 pF
Including
jig and
scope
Figure 1
353 Ω
Figure 2
READ CYCLE SWITCHING CHARACTERISTICS(1) (Over Operating Range)
Symbol Parameter
-10 ns
Min.
Max.
-12 ns
Min. Max.
Unit
tRC
Read Cycle Time
10
—
12
—
ns
tAA
Address Access Time
—
10
—
12
ns
tOHA
Output Hold Time
3
—
3
—
ns
tACE
CE Access Time
—
10
—
12
ns
tDOE
OE Access Time
—
4
—
5
ns
tLZOE(2)
OE to Low-Z Output
0
—
0
—
ns
tHZOE(2)
OE to High-Z Output
0
4
0
5
ns
tLZCE
CE to Low-Z Output
3
—
3
—
ns
CE to High-Z Output
0
4
0
5
ns
(2)
tHZCE
(2)
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.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
5
®
ISSI
IS61LV2568
®
AC WAVEFORMS
READ CYCLE NO. 1(1,2) (Address Controlled) (CE = OE = VIL)
t RC
ADDRESS
t AA
t OHA
t OHA
DOUT
DATA VALID
PREVIOUS DATA VALID
READ1.eps
READ CYCLE NO. 2(1,3) (CE and OE Controlled)
t RC
ADDRESS
t AA
t OHA
OE
t HZOE
t DOE
t LZOE
CE
t ACE
t HZCE
t LZCE
DOUT
HIGH-Z
DATA VALID
CE_RD2.eps
Notes:
1. WE is HIGH for a Read Cycle.
2. The device is continuously selected. OE, CE = VIL.
3. Address is valid prior to or coincident with CE LOW transitions.
6
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
ISSI
IS61LV2568
WRITE CYCLE SWITCHING CHARACTERISTICS(1,2) (Over Operating Range)
-10 ns
Min.
Max.
Symbol Parameter
-12 ns
Min. Max.
Unit
tWC
Write Cycle Time
10
—
12
—
ns
tSCE
CE to Write End
8
—
9
—
ns
tAW
Address Setup Time to
Write End
8
—
9
—
ns
tHA
Address Hold from
Write End
0
—
0
—
ns
tSA
Address Setup Time
0
—
0
—
ns
tPWE1
WE Pulse Width (OE = HIGH)
7
—
8
—
ns
tPWE2
WE Pulse Width (OE = LOW)
8
—
10
—
ns
tSD
Data Setup to Write End
5
—
6
—
ns
tHD
Data Hold from Write End
0
—
0
—
ns
tHZWE(3) WE LOW to High-Z Output
—
4
—
5
ns
tLZWE(3) WE HIGH to Low-Z Output
0
—
0
—
ns
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. 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, 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.
3. Tested with the load in Figure 2. Transition is measured ±500 mV from steady-state voltage. Not 100% tested.
AC WAVEFORMS
WRITE CYCLE NO. 1(1,2) (CE Controlled, OE = HIGH or LOW)
t WC
VALID ADDRESS
ADDRESS
t SA
t SCE
t HA
CE
t AW
t PWE1
t PWE2
WE
t HZWE
DOUT
DATA UNDEFINED
t LZWE
HIGH-Z
t SD
DIN
t HD
DATAIN VALID
CE_WR1.eps
Note:
1. 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, but any
can be deasserted to terminate the Write. The Data Input Setup and Hold timing is referenced to the rising or falling edge of the signal that
terminates the Write.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
7
®
ISSI
IS61LV2568
®
AC WAVEFORMS
WRITE CYCLE NO. 2(1) (WE Controlled, OE = HIGH during Write Cycle)
t WC
ADDRESS
VALID ADDRESS
t HA
OE
CE
LOW
t AW
t PWE1
WE
t SA
DOUT
t HZWE
t LZWE
HIGH-Z
DATA UNDEFINED
t SD
t HD
DATAIN VALID
DIN
CE_WR2.eps
Note:
1. 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, but any
can be deasserted to terminate the Write. The Data Input Setup and Hold timing is referenced to the rising or falling edge of the signal that
terminates the Write.
WRITE CYCLE NO. 3 (WE Controlled: OE is LOW During Write Cycle)
t WC
ADDRESS
VALID ADDRESS
OE
LOW
CE
LOW
t HA
t AW
t PWE2
WE
t SA
DOUT
DATA UNDEFINED
t HZWE
t LZWE
HIGH-Z
t SD
DIN
t HD
DATAIN VALID
CE_WR3.eps
Note:
1. 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, but any
can be deasserted to terminate the Write. The Data Input Setup and Hold timing is referenced to the rising or falling edge of the signal that
terminates the Write.
8
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
ISSI
IS61LV2568
ORDERING INFORMATION
Commercial Range: 0°C to +70°C
Speed (ns)
Order Part No.
Package
10
IS61LV2568-10K
IS61LV2568-10T
400-mil Plastic SOJ
TSOP (Type II)
12
IS61LV2568-12K
IS61LV2568-12T
400-mil Plastic SOJ
TSOP (Type II)
ORDERING INFORMATION
Industrial Range: –40°C to +85°C
Speed (ns)
Order Part No.
Package
10
IS61LV2568-10KI
IS61LV2568-10TI
400-mil Plastic SOJ
TSOP (Type II)
12
IS61LV2568-12KI
400-mil Plastic SOJ
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. B
02/07/03
9
®
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