White Electronic Designs
256Kx16 PLASTIC SRAM
PLASTIC PLUS® FEATURES
Access Times of 15, 17, 20, 25ns
Standard Commercial Off-The-Shelf (COTS)
Memory Devices for Extended Temperature Range
Industry Standard 44 Lead Plastic SOJ Package
Electrical and Speed Characteristics for:
•
•
•
Military Temperature (-55°C to +125°C)
Industrial Temperature (-40°C to +85°C)
Commercial Temperature (0°C to +70°C)
EDI816256CA-XM44XG
WPS256K16X-XLJXG
PIN CONFIGURATION FOR WPS256K16X-XLJXG
Top View
A0
A1
A2
A3
A4
CS#
I/O1
I/O2
I/O3
I/O4
V
CC
V
SS
I/O5
I/O6
I/O7
I/O8
WE#
A5
A6
A7
A8
A9
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
A17
A16
A15
OE#
UB#
LB#
I/O16
I/O15
I/O14
I/O13
V
SS
V
CC
I/O12
I/O11
I/O10
I/O9
NC
A14
A13
A12
A11
A10
Burn-in and Temperature Cycling Available
Organized as 256K x 16
Center Power/Ground Pins (Revolutionary)
Data Byte Control:
•
•
Lower Byte (LB) = I/O
1-8
Upper Byte (UB) = I/O
9-16
5 Volt Power Supply
Low Power Dissipation CMOS
Battery Back-Up Operation
RoHS Compliant
* This product is subject to change without notice.
PIN DESCRIPTION
A
0-17
LB#
UB#
I/0A
1-16
WE#
CS#
OE#
V
CC
V
SS
NC
Address Inputs
Lower-Byte Control (I/O
1-8)
Upper-Byte Control (I/O
9-16
)
Data Input/Output
Chip Select
Output Enable
Write Enable
+5.0V Power
Ground
Not Connected
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
March 2009
Rev. 1
1
White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com
White Electronic Designs
ABSOLUTE MAXIMUM RATINGS
Parameter
Operating Temperature (Mil.)
Operating Temperature (Ind.)
Storage Temperature
Signal Voltage Relative to V
SS
Supply Voltage
Symbol
T
A
T
A
T
STG
V
G
V
CC
Min
-55
-40
-65
-0.5
-0.5
Max
+125
+85
+150
V
CC
+ 0.5
7.0
Unit
°C
°C
°C
V
V
EDI816256CA-XM44XG
WPS256K16X-XLJXG
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply Voltage
Input High Voltage
Input Low Voltage
Operating Temp. (Mil.)
Operating Temp. (Ind.)
Symbol
V
CC
V
IH
V
IL
T
A
T
A
Min
4.5
2.2
-0.3
-55
-40
Max
5.5
V
CC
+ 0.5
+0.8
+125
+85
Unit
V
V
V
°C
°C
NOTES:
Stresses above 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 device reliability.
CAPACITANCE
T
A
= +25°C
Parameter
Input capacitance
Output capacitance
Symbol
C
IN
C
OUT
Conditions
V
IN
= 0V, f = 1.0 MHz
V
IN
= 0V, f = 1.0 MHz
Max Unit
6
pF
8
pF
This parameter is guaranteed by design but not tested.
TRUTH TABLE
CS
H
L
L
L
WE#
X
H
H
H
OE#
X
H
H
L
LB#
X
X
H
L
H
L
L
H
L
UB#
Mode
Not Select
Out Disable
H
L
L
H
L
L
Read
Data I/O
I/O
1-8
High-Z
High-Z
Data Out
High Z
Data Out
Data In
High Z
Data In
I/O
9-16
High-Z
High-Z
High Z
Data Out
Data Out
High Z
Data In
Data In
Power
Standyby
Active
Active
L
L
X
Write
Active
DC CHARACTERISTICS
V
CC
= 5.0V, V
SS
= 0V, T
A
= -55 +125°C
Parameter
Input Leakage Current
Output Leakage Current
V
CC
Read Current (1, 2)
V
CC
Standby Current (2, 5)
Output Low Voltage
Output High Voltage
Symbol
I
LI
I
LO
I
CC
I
BS
V
OL
V
OH
Conditions
V
CC
= 5.5, V
IN
= V
SS
to V
CC
CS = V
IH
, OE = V
IH
, V
OUT
= V
SS
to V
CC
CS = V
IL
, OE = V
IH
, f = 5MHz, Vcc = 5.5
CS = V
IH
, OE = V
IH
, f = 5MHz, Vcc = 5.5
I
OL
= 8.0
M
A, V
CC
= 4.5
I
OH
= -4.0
M
A, V
CC
= 4.5
Min
Max
10
10
275
17
0.4
Unit
μA
μA
mA
mA
V
V
2.4
NOTES: DC test conditions: VIL = 0.3V, VIH = Vcc -0.3V
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
March 2009
Rev. 1
2
White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com
White Electronic Designs
(TA = -55°C TO +125°C)
Parameter
Data Retention Supply Voltage
Low Power Data Retention
Symbol
I
LI
I
LO
Conditions
V
CC
= 5.5, V
IN
= V
SS
to V
CC
CS = V
IH
, OE = V
IH
, V
OUT
= V
SS
to V
CC
EDI816256CA-XM44XG
WPS256K16X-XLJXG
Data Retention Characteristics
Min
2.0
Typ
1
Max
5.5
15
Unit
V
mA
AC CHARACTERISTICS
(V
CC
= 5.0V, V
SS
= 0V, TA = -55°C TO +125°C)
Parameter
Read Cycle Time
Address Access Time
Output Hold from Address Change
Chip Select Access Time
Output Enable to Output Valid
Chip Select 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
LB#, UB# Access Time
LB#, UB# Enable to Low Z Output
LB#, UB# Disable to High Z Output
Symbol
t
RC
t
AA
t
OH
t
ACS
t
OE
t
CLZ
1
-15
Min
15
15
0
15
10
3
0
8
8
10
0
8
0
3
0
0
Max
Min
-17
Max
17
17
0
12
10
3
0
10
12
12
0
10
Min
20
-20
Max
20
0
20
12
3
0
10
10
12
0
10
Min
25
-25
Max
25
25
15
Unit
ns
ns
ns
ns
ns
ns
ns
t
OLZ
1
t
CHZ
t
BA
t
BLZ
1
t
BH2
1
1
12
12
14
12
ns
ns
ns
ns
ns
t
OHZ
1
NOTES:
1. This parameter is guaranteed by design but not tested
AC TEST CONDITIONS
AC TEST CONDITIONS
I
OL
Current Source
Parameter
Input Pulse Levels
Input Rise and Fall
Input and Output Reference Level
Output Timing Reference Level
1.5V
Typ
V
IL = 0,
V
IH = 3.0
5
1.5
1.5
Unit
V
ns
V
V
D.U.T.
C
eff
= 50 pf
V
Z
(Bipolar Supply)
I
OH
Current Source
Notes:
VZ is programmable from -2V to +7V.
I
OL
& I
OH
programmable from 0 to 16mA.
Tester Impedance Z0 = 75
Ω.
VZ is typically the midpoint of VOH and VOL.
I
OL
& I
OH
are adjusted to simulate a typical resistive load circuit.
ATE tester includes jig capacitance.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
March 2009
Rev. 1
3
White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com
White Electronic Designs
AC CHARACTERISTICS
V
CC
= 5.0V, GND = 0V, -55°C
≤
T
A
≤
+125°C
Parameter
Write Cycle Time
Chip Select to End of Write
Address Valid to End of Write
Data Valid to End of Write
Write Pulse Width
Address Setup Time
Address Hold Time
Output Active from End of Write
Write Enable to Output in High Z
Data Hold Time
LB#, UB# Valid to End Wright
EDI816256CA-XM44XG
WPS256K16X-XLJXG
Symbol
t
WC
t
CW
t
AW
t
DW
t
WP
t
AS
t
AH
t
OW
1
-15
Min
15
12
12
10
12
0
0
0
8
0
12
0
15
Max
Min
17
15
15
12
15
0
0
0
-17
Max
Min
20
17
17
12
17
0
0
0
10
0
17
-20
Max
Min
25
20
20
15
20
0
0
0
10
0
20
-25
Max
Unit
ns
ns
ns
ns
ns
ns
ns
ns
10
ns
ns
ns
t
WHZ
1
t
DH
t
BW
NOTES:
1. This parameter is guaranteed by design but not tested
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
March 2009
Rev. 1
4
White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com
White Electronic Designs
EDI816256CA-XM44XG
WPS256K16X-XLJXG
TIMING WAVEFORM - READ CYCLE
t
RC
ADDRESS
t
RC
ADDRESS
CS#
t
AA
t
AA
t
OH
DATA I/O
PREVIOUS DATA VALID
DATA VALID
t
ACS
t
CHZ
LB#, UB#
t
BA
t
BLZ
t
CLZ
OE#
t
OE
t
OLZ
DATA I/O
HIGH IMPEDANCE
READ CYCLE 2 (WE# = V
IH
)
t
OHZ
DATA VALID
t
BHZ
READ CYCLE 1 (CS# = OE# = V
IL
, UB# or LB# = V
IL
, WE# = V
IH
)
WRITE CYCLE - WE# CONTROLLED
t
WC
ADDRESS
t
AW
t
CW
CS#
t
AH
t
BW
LB#, UB#
t
AS
WE#
t
WP
t
OW
t
WHZ
t
DW
DATA VALID
t
DH
DATA I/O
WRITE CYCLE 1, WE# CONTROLLED
WRITE CYCLE - CS# CONTROLLED
t
WC
t
WC
ADDRESS
t
AW
t
AS
CS#
ADDRESS
t
AW
t
AS
CS#
t
CW
t
AH
t
CW
t
AH
t
BW
LB#, UB#
LB#, UB#
t
BW
t
WP
WE#
WE#
t
WP
t
DW
t
DH
t
DW
t
DH
DATA I/O
WRITE CYCLE 2, CS# CONTROLLED
DATA VALID
DATA I/O
WRITE CYCLE 3, CS# CONTROLLED
DATA VALID
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
March 2009
Rev. 1
5
White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com
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