WEDC EDI88257CAXCI 256kx8 monolithic sram Datasheet

White Electronic Designs
EDI88257CA
256Kx8 Monolithic SRAM
FEATURES
The EDI88257CA is a 2 Megabit 256Kx8 bit Monolithic
CMOS Static RAM.
Access Times of 20, 25, 35, 45, 55ns
Data Retention Function (LPA Versions)
TTL Compatible Inputs and Outputs
Fully Static, No Clocks
Organized as 256Kx8
Commercial, Industrial and Military Temperature
Ranges
JEDEC Approved Evolutionary Pinout
The 32 pin DIP pinout adheres to the JEDEC evolutionary
standard for the two megabit device. The device is
upgradeable to the 512Kx8 SRAM, the EDI88512CA. Pin
1 becomes the higher order address.
A Low Power version, EDI88257LPA, offers a data retention
function for battery back-up opperation. Military product is
available compliant to Appendix A of MIL-PRF-38535.
• 32 pin Ceramic DIP, 0.6 mils wide (Package 9)
This product is subject to change without notice.
Single +5V (±10%) Supply Operation
FIGURE 1 – PIN CONFIGURATION
PIN DESCRIPTION
32 DIP
TOP VIEW
NC
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
I/O0-7
A0-17
WE#
CS#
OE#
VCC
VSS
NC
VCC
A15
A17
WE#
A13
A8
A9
A11#
OE
A10
CS#
I/O7
I/O6
I/O5
I/O4
I/O3
Data Inputs/Outputs
Address Inputs
Write Enable
Chip Selects
Output Enable
Power (+5V ±10%)
Ground
Not Connected
BLOCK DIAGRAM
Memory Array
A0-17
Address
Buffer
Address
Decoder
I/O
Circuits
I/O0-7
WE#
CS
OE#
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
White Electronic Designs
EDI88257CA
ABSOLUTE MAXIMUM RATINGS
Parameter
Voltage on any pin relative to Vss
Operating Temperature TA (Ambient)
Industrial
Military
Storage Temperature, Ceramic
Power Dissipation
Output Current
Junction Temperature, TJ
TRUTH TABLE
Value
-0.5 to 7.0
Unit
V
-40 to +85
-55 to +125
-65 to +150
1.5
20
175
°C
°C
°C
W
mA
°C
OE#
X
H
L
X
CS#
H
L
L
L
WE#
X
H
H
L
Mode
Standby
Output Deselect
Read
Write
Output
High Z
High Z
Data Out
Data In
Power
ICC2, ICC3
ICC1
ICC1
ICC1
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply Voltage
Supply Voltage
Input High Voltage
Input Low Voltage
NOTE:
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 greater than those indicated in the
operational sections of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
Symbol
VCC
VSS
VIH
VIL
Min
4.5
0
2.2
-0.3
Typ
5.0
0
—
—
Max
5.5
0
VCC +0.5
+0.8
Unit
V
V
V
V
CAPACITANCE
Parameter
Address Lines
Data Lines
Symbol
CI
CO
Condition
VIN = Vcc or Vss, f = 1.0MHz
VOUT = Vcc or Vss, f = 1.0MHz
Max
12
14
Unit
pF
pF
These parameters are sampled, not 100% tested.
DC CHARACTERISTICS
VCC = 5V, TA = +25°C
Parameter
Input Leakage Current
Output Leakage Current
Symbol
ILI
ILO
Conditions
VIN = 0V to VCC
VI/O = 0V to VCC
Operating Power Supply Current
ICC1
WE#, CS# = VIL, II/O = 0mA, Min Cycle
Standby (TTL) Power Supply Current
ICC2
Full Standby Power Supply Current
ICC3
Output Low Voltage
Output High Voltage
VOL
VOH
CS# ≥ VIH, VIN ≤ VIL, VIN ≥ VIH
CS# ≥ VCC -0.2V
VIN ≥ Vcc -0.2V or VIN ≤ 0.2V
IOL = 8.0mA
IOH = -4.0mA
(20-25ns)
(35-55ns)
C
LP
Min
-10
-10
—
—
—
—
—
—
2.4
Typ
—
—
Max
+10
+10
225
200
60
25
20
0.4
—
—
—
—
—
Units
µA
µA
mA
mA
mA
mA
mA
V
V
AC TEST CONDITIONS
Figure 1
Figure 2
Vcc
480Ω
Q
Input Pulse Levels
Vcc
480Ω
30pF
Input Rise and Fall Times
5ns
Input and Output Timing Levels
1.5V
Output Load
Figure 1
NOTE: For tEHQZ, tGHQZ and tWLQZ, CL = 5pF Figure 2
Q
255Ω
VSS to 3.0V
255Ω
5pF
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
2
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
White Electronic Designs
EDI88257CA
AC CHARACTERISTICS – READ CYCLE
VCC = 5.0V, Vss = 0V, -55°C ≤ TA ≤ +125°C
Symbol
Parameter
Read Cycle Time
Address Access Time
Chip Enable Access Time
Chip Enable to Output in Low Z (1)
Chip Disable to Output in High Z (1)
Output Hold from Address Change
Output Enable to Output Valid
Output Enable to Output in Low Z (1)
Output Disable to Output in High Z(1)
JEDEC
tAVAV
tAVQV
tELQV
tELQX
tEHQZ
tAVQX
tGLQV
tGLQX
tGHQZ
20ns
Alt.
tRC
tAA
tACS
tCLZ
tCHZ
tOH
tOE
tOLZ
tOHZ
Min
20
25ns
Max
Min
25
20
20
3
0
0
Min
35
3
0
0
3
0
0
15
12
0
0
8
Min
45
10
15
Min
55
Max
45
45
3
0
0
20
15
0
0
55ns
Max
35
35
10
10
45ns
Max
25
25
8
0
0
35ns
Max
55
55
3
0
0
20
25
0
0
20
25
0
0
20
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
1. This parameter is guaranteed by design but not tested.
AC CHARACTERISTICS – WRITE CYCLE
VCC = 5.0V, VSS = 0V, -55°C≤ TA ≤ +125°C
Symbol
Parameter
Write Cycle Time
Chip Enable to End of Write
Address Setup Time
Address Valid to End of Write
Write Pulse Width
Write Recovery Time
Data Hold Time
Write to Output in High Z (1)
Data to Write Time
Output Active from End of Write (1)
20ns
25ns
Max
Min
25
35ns
Alt.
tWC
Min
20
tELWH
tELEH
tAVWL
tAVEL
tAVWH
tAVEH
tWLWH
tWLEH
tCW
tCW
tAS
tAS
tAW
tAW
tWP
tWP
15
15
0
0
15
15
15
15
17
17
0
0
17
17
17
17
25
25
0
0
25
25
25
25
30
30
0
0
30
30
30
30
30
30
0
0
30
30
30
30
ns
ns
ns
ns
ns
ns
ns
ns
tWHAX
tEHAX
tWHDX
tEHDX
tWLQZ
tDVWH
tDVEH
tWHQX
tWR
tWR
tDH
tDH
tWHZ
tDW
tDW
tWLZ
0
0
0
0
0
10
10
0
0
0
0
0
0
12
12
0
0
0
0
0
0
20
20
0
0
0
0
0
0
25
25
0
0
0
0
0
0
25
25
0
ns
ns
ns
ns
ns
ns
ns
ns
30
Min
35
Max
25
Min
45
55ns
JEDEC
tAVAV
30
Max
45ns
Max
30
Min
55
Max
30
Units
ns
1. This parameter is guaranteed by design but not tested.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
3
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
White Electronic Designs
EDI88257CA
FIGURE 2 – TIMING WAVEFORM - READ CYCLE
tAVAV
ADDRESS
tAVQV
CS#
tAVAV
ADDRESS
ADDRESS 1
ADDRESS 2
tAVQV
tAVQX
tELQV
tELQX
tEHQZ
tGLQV
tGLQX
tGHQZ
OE#
DATA I/O
DATA 1
DATA OUT
DATA 2
READ CYCLE 2 (WE# HIGH)
READ CYCLE 1 (WE# HIGH; OE#, CS# LOW)
FIGURE 3 – WRITE CYCLE - WE# CONTROLLED
tAVAV
ADDRESS
tAVWH
tELWH
tWHAX
CS#
tAVWL
tWLWH
WE#
tWHDX
tDVWH
DATA IN
DATA VALID
tWLQZ
tWHQX
HIGH Z
DATA OUT
WRITE CYCLE 1, WE# CONTROLLED
FIGURE 4 – WRITE CYCLE - CS# CONTROLLED
tAVAV
ADDRESS
tAVEH
tELEH
tEHAX
CS#
tAVEL
tWLEH
WE#
tDVEH
DATA IN
DATA OUT
tEHDX
DATA VALID
HIGH Z
WRITE CYCLE 2, CS# CONTROLLED
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
4
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
White Electronic Designs
EDI88257CA
DATA RETENTION CHARACTERISTICS (EDI88512LP ONLY)
-55°C ≤ TA ≤ +125°C
Characteristic
Low Power Version only
Sym
Conditions
Min
Typ
Max
Units
Data Retention Voltage
Data Retention Quiescent Current
VCC
ICCDR
VCC = 2.0V
CS# ≥ VCC -0.2V
2
–
–
–
–
2
V
µA
Chip Disable to Data Retention Time
Operation Recovery Time
tCDR
TR
VIN ≥ VCC -0.2V
or VIN ≤ 0.2V
0
tAVAV
–
–
–
–
ns
ns
FIGURE 5 – DATA RETENTION - CS# CONTROLLED
DATA RETENTION MODE
4.5V
VCC
VCC
4.5V
tCDR
CS#
tR
CS# = VCC -0.2V
DATA RETENTION, CS# CONTROLLED
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
5
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
White Electronic Designs
EDI88257CA
PACKAGE 9: 32 PIN SIDEBRAZED CERAMIC DIP (600mils wide)
1.616
1.584
0.620
0.600
0.060
0.040
Pin 1 Indicator
0.200
0.125
0.061
0.017
0.155
0.115
0.100
TYP
0.020
0.016
0.600
NOM
15 x 0.100 = 1.500
ALL DIMENSIONS ARE IN INCHES
ORDERING INFORMATION
EDI 8 8 257 CA X X X
WHITE ELECTRONIC DESIGNS
SRAM
ORGANIZATION, 256Kx8
TECHNOLOGY:
CA = CMOS Standard Power
LPA = Low Power
ACCESS TIME (ns)
PACKAGE TYPE:
C = 32 lead Sidebrazed DIP, 600 mil (Package 9)
DEVICE GRADE:
B = MIL-STD-883 Compliant
M = Military Screened
I = Industrial
C = Commercial
-55°C to +125°C
-40°C to +85°C
0°C to +70°C
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
6
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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