SRAM
Austin Semiconductor, Inc.
64K x 4 SRAM
SRAM MEMORY ARRAY
AVAILABLE AS MILITARY
SPECIFICATIONS
• SMD 5962-88681
• MIL-STD-883
MT5C2564
PIN ASSIGNMENT
(Top View)
FEATURES
•
•
•
•
High Speed: 15, 20, 25, 35, 45, 55, and 70
Battery Backup: 2V data retention
Low power standby
High-performance, low-power, CMOS double-metal
process
• Single +5V (+10%) Power Supply
• Easy memory expansion with CE\
• All inputs and outputs are TTL compatible
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
CE\
Vss
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Vcc
A15
A14
A13
A12
A11
A10
DQ4
DQ3
DQ2
DQ1
WE\
A1
A0
NC
Vcc
NC
3 2 1 28 27
A2
A3
A4
A5
A6
A7
A8
A9
CE\
4
5
6
7
8
9
10
11
12
26
25
24
23
22
21
20
19
18
A15
A14
A13
A12
A11
A10
DQ4
DQ3
DQ2
24-Pin DIP (C)
(300 MIL)
28-Pin LCC (EC)
13 14 15 16 17
DQ1
WE\
NC
Vss
NC
OPTIONS
• Timing
15ns access
20ns access
25ns access
35ns access
45ns access
55ns access
70ns access
• Package(s)
Ceramic DIP (300 mil)
Ceramic LCC
MARKING
-15
-20
-25
-35
-45
-55*
-70*
GENERAL DESCRIPTION
The Austin Semiconductor SRAM family employs
high-speed, low-power CMOS and are fabricated using double-
layer metal, double-layer polysilicon technology.
For flexibility in high-speed memory applications,
Austin Semiconductor offers chip enable (CE\) on all organiza-
tions. This enhancement can place the outputs in High-Z for
additional flexibility in system design. The x4 configuration
features common data input and output.
Writing to these devices is accomplished when write
enable (WE\) and CE\ inputs are both LOW. Reading is accom-
plished when WE\ remains HIGH and CE\ goes LOW. The
device offers a reduced power standby mode when disabled.
This allows system designs to achieve low standby power re-
quirements.
These devices operate from a single +5V power sup-
ply and all inputs and outputs are fully TTL compatible.
C
EC
No. 106
No. 204
• Operating Temperature Ranges
Industrial (-40
o
C to +85
o
C)
IT
o
o
Military (-55 C to +125 C)
XT
• 2V data retention/low power
L
*Electrical characteristics identical to those provided for the 45ns
access devices.
For more products and information
please visit our web site at
www.austinsemiconductor.com
MT5C2564
Rev. 2.0 11/00
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
1
SRAM
Austin Semiconductor, Inc.
FUNCTIONAL BLOCK DIAGRAM
V
CC
A0
A1
MT5C2564
GND
ROW DECODER
A3
A4
A5
A13
A14
A15
262,144-BIT
MEMORY ARRAY
I/O CONTROL
A2
DQ4
DQ1
CE\
COLUMN DECODER
WE\
A6
A7
A8
A9
A10
A11
A12
POWER
DOWN
TRUTH TABLE
MODE
STANDBY
READ
WRITE
CE\
H
L
L
WE\
X
H
L
DQ
HIGH-Z
Q
D
POWER
STANDBY
ACTIVE
ACTIVE
MT5C2564
Rev. 2.0 11/00
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
2
SRAM
Austin Semiconductor, Inc.
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Vss..................................-0.5V to +7V
Voltage on Vcc Supply Relative to Vss.............................-0.5V to +7V
Storage Temperature......................................................-65
o
C to +150
o
C
Power Dissipation..............................................................................1W
Short Circuit Output Current.........................................................50mA
Lead Temperature (soldering 10 seconds)....................................+260
o
C
Junction Temperature..................................................................+175
o
C
MT5C2564
*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 at
these or any other conditions above those indicated in the
operation section of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods
may affect reliability.
ELECTRICAL CHARACTERISTICS AND RECOMMENDED DC OPERATING CONDITIONS
(-55
o
C < T
C
< 125
o
C; V
CC
= 5V +10%)
DESCRIPTION
Input High (Logic 1) Voltage
Input Low (Logic 0) Voltage
Input Leakage Current
Output Leakage Current
Output High Voltage
Output Low Voltage
CONDITIONS
SYM
V
IH
V
IL
MIN
2.2
-0.5
-10
-10
2.4
MAX
V
CC
+0.5
0.8
10
10
UNITS
V
V
µA
µA
V
NOTES
1
1, 2
0V<V
IN
<V
CC
Output(s) disabled
0V<V
OUT
<V
CC
I
OH
=-4.0mA
I
OL
=8.0mA
IL
I
IL
O
V
OH
V
OL
1
1
0.4
MAX
-25
140
V
PARAMETER
Power Supply
Current: Operating
Power Supply
Current: Standby
CONDITIONS
CE\ < V
IL
; V
CC
= MAX
f = MAX = 1/t
RC
(MIN)
Output Open
CE\ > V
IH
; All Other Inputs
< V
IL
or > V
IH
, V
CC
= MAX
f = 0 Hz
CE\ > V
CC
-0.2V; V
CC
= MAX
V
IL
< V
SS
+0.2V
V
IH
> V
CC
-0.2V; f = 0 Hz
"L" Version Only
SYM
I
cc
-15
165
-20
150
-35
120
-45
120
UNITS NOTES
mA
3
I
SBT2
45
45
40
25
25
mA
I
SBC2
I
SBC2
20
4
20
4
20
4
20
4
20
4
mA
mA
CAPACITANCE
DESCRIPTION
Input Capacitance
Output Capacitance
CONDITIONS
T
A
= 25 C, f = 1MHz
V
CC
= 5V
o
SYM
C
I
C
O
MAX
10
12
UNITS
pF
pF
NOTES
4
4
MT5C2564
Rev. 2.0 11/00
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
3
SRAM
Austin Semiconductor, Inc.
MT5C2564
ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS
(Note 5) (-55
o
C < T
C
< 125
o
C; V
CC
= 5V +10%)
DESCRIPTION
READ CYCLE
READ cycle time
Address access time
Chip Enable access time
Output hold from address change
Chip Enable to output in Low-Z
Chip disable to output in High-Z
Chip Enable to power-up time
Chip disable to power-down time
WRITE CYCLE
WRITE cycle time
Chip Enable to end of write
Address valid to end of write
Address setup time
Address hold from end of write
WRITE pulse width
Data setup time
Data hold time
Write disable to output in Low-Z
Write Enable to output in High-Z
-15
-20
-25
-35
-45
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX UNITS NOTES
SYMBOL
t
RC
t
AA
t
ACE
t
OH
t
LZCE
t
HZCE
t
PU
t
PD
t
WC
t
CW
t
AW
t
AS
t
AH
t
WP
t
DS
t
DH
t
LZWE
t
HZWE
15
15
15
3
3
8
0
15
15
12
12
0
2
12
7
0
0
0
20
15
15
0
2
15
10
0
0
0
0
20
25
18
18
0
2
17
12
0
0
0
3
3
10
0
25
35
30
30
0
5
30
20
0
0
0
20
20
20
3
3
10
0
35
45
40
40
0
5
40
20
0
0
0
25
25
25
3
3
20
0
45
35
35
35
3
3
20
45
45
45
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
7
6, 7
4
4
7
10
11
20
20
7
6, 7
MT5C2564
Rev. 2.0 11/00
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
4
SRAM
Austin Semiconductor, Inc.
AC TEST CONDITIONS
Input pulse levels ...................................... Vss to 3.0V
Input rise and fall times ......................................... 5ns
Input timing reference levels ................................ 1.5V
Output reference levels ....................................... 1.5V
Output load ................................. See Figures 1 and 2
MT5C2564
167Ω
Q
30pF
V
TH
= 1.73V Q
167Ω
5pF
V
TH
= 1.73V
Fig. 1 Output Load
Equivalent
Fig. 2 Output Load
Equivalent
NOTES
1.
2.
3.
All voltages referenced to V
SS
(GND).
-3V for pulse width < 20ns
I
CC
is dependent on output loading and cycle rates.
The specified value applies with the outputs
unloaded, and f =
1
Hz.
t
RC (MIN)
This parameter is guaranteed but not tested.
Test conditions as specified with the output loading
as shown in Fig. 1 unless otherwise noted.
t
LZCE
, t
LZWE
, t
LZOE
, t
HZCE
, t
HZOE
and t
HZWE
are
specified with CL = 5pF as in Fig. 2. Transition is
measured ±200mV typical from steady state voltage,
4.
5.
6.
allowing for actual tester RC time constant.
7. At any given temperature and voltage condition,
t
HZCE
is less than t
LZCE
, and t
HZWE
is less than t
LZWE
and
t
HZOE
is less than t
LZOE
.
8. WE\ is HIGH for READ cycle.
9. Device is continuously selected. Chip enable is held in
its active state.
10. Address valid prior to, or coincident with, latest
occurring chip enable.
11. t
RC
= Read Cycle Time.
12. Chip enable (CE\) and write enable (WE\) can initiate and
terminate a WRITE cycle.
DATA RETENTION ELECTRICAL CHARACTERISTICS (L Version Only)
DESCRIPTION
VCC for Retention Data
CE\ > (V
CC
- 0.2V)
Data Retention Current
Chip Deselect to Data
Retention Time
Operation Recovery Time
V
IN
> (V
CC
- 0.2V)
or < 0.2V
V
CC
= 2V
V
CC
= 3V
t
CDR
t
R
0
t
RC
CONDITIONS
SYM
V
DR
I
CCDR
MIN
2
MAX
---
1
2
---
UNITS
V
mA
mA
ns
ns
4
4, 11
NOTES
LOW Vcc DATA RETENTION WAVEFORM
V
CC
t
CDR
DATA RETENTION MODE
4.5V
V
DR
> 2V
4.5V
t
R
V
DR
MT5C2564
Rev. 2.0 11/00
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
5
4321
4321
4321
4321
321
21
321
321
3
CE\
V
IH
V
IL
2165
43
87
4365
21214321
87
23214321
87
41214321
21214321
4365
8765
87654321
4321
3 1
87654321
4321
4321
321
321
87654321
4321
321
2
87654321
DON’T CARE
UNDEFINED
