STK10C68
STK10C68-M SMD#5962-93056
8K x 8 nvSRAM
QuantumTrap™
CMOS
Nonvolatile Static RAM
Obsolete - Not Recommend for new Designs
FEATURES
• 25ns, 35ns, 45ns and 55ns Access Times
•
STORE
to Nonvolatile Elements Initiated by
Hardware
•
RECALL
to SRAM Initiated by Hardware or
Power Restore
• Automatic
STORE
Timing
• 10mA Typical I
CC
at 200ns Cycle Time
• Unlimited READ, WRITE and
RECALL
Cycles
• 1,000,000
STORE
Cycles to Nonvolatile Ele-
ments (Industrial/Commercial)
• 100-Year Data Retention (Industrial/Commer-
cial)
• Commercial, Industrial and Military Tempera-
tures
• 28-Pin DIP, SOIC and LCC Packages
DESCRIPTION
The Simtek STK10C68 is a fast static
RAM
with a nonvol-
atile element incorporated in each static memory cell. The
SRAM
can be read and written an unlimited number of
times, while independent nonvolatile data resides in
Non-
volatile Elements
. Data may easily be transferred from
the
SRAM
to the
Nonvolatile Elements
(the
STORE
oper-
ation
), or from the
Nonvolatile Elements
to the
SRAM
(the
RECALL
operation), using the NE pin.
Transfers
from the Nonvolatile Elements to the
SRAM
(the
RECALL
operation) also take place automatically on
restoration of power.
The STK10C68 combines the high
performance and ease of use of a fast
SRAM
with nonvol-
atile data integrity.
The STK10C68 features industry-standard pinout for non-
volatile
RAM
s. MIL-STD-883 and Standard Military Draw-
ing (
SMD
#5962-93056) devices are available.
BLOCK DIAGRAM
QUANTUM TRAP
128 x 512
ROW DECODER
PIN CONFIGURATIONS
NE
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A
5
A
6
A
7
A
8
A
9
A
11
A
12
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
STORE
STATIC RAM
ARRAY
128 x 512
RECALL
V
CC
W
NC
A
8
A
9
A
11
G
A
10
E
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
28 - LCC
28 - DIP
28 - SOIC
INPUT BUFFERS
COLUMN I/O
COLUMN DEC
STORE/
RECALL
CONTROL
PIN NAMES
A
0
- A
12
W
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Nonvolatile Enable
Power (+ 5V)
Ground
A
0
A
1
A
2
A
3
A
4
A
10
G
NE
E
W
DQ
0
- DQ
7
E
G
NE
V
CC
V
SS
March 2006
1
Document Control # ML0006 rev 0.2
STK10C68
ABSOLUTE MAXIMUM RATINGS
a
Voltage on Input Relative to Ground . . . . . . . . . . . . . .–0.5V to 7.0V
Voltage on Input Relative to V
SS
. . . . . . . . . . –0.6V to (V
CC
+ 0.5V)
Voltage on DQ
0-7
. . . . . . . . . . . . . . . . . . . . . . –0.5V to (V
CC
+ 0.5V)
Temperature under Bias . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
DC Output Current (1 output at a time, 1s duration) . . . . . . . . 15mA
Note a: 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 condi-
tions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rat-
ing conditions for extended periods may affect reliability.
DC CHARACTERISTICS
COMMERCIAL
SYMBOL
I
CC1
b
PARAMETER
MIN
Average V
CC
Current
MAX
85
75
65
N/A
3
10
27
23
20
N/A
750
±1
±5
2.2
V
SS
– .5
2.4
0.4
0
70
–40/-55
V
CC
+ .5
0.8
2.2
V
SS
– .5
2.4
0.4
85/125
INDUSTRIAL/
MILITARY
MIN
MAX
90
75
65
55
3
10
28
24
21
20
1500
±1
±5
V
CC
+ .5
0.8
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
μA
μA
μA
V
V
V
V
°C
UNITS
(V
CC
= 5.0V
±
10%)
NOTES
t
AVAV
= 25ns
t
AVAV
= 35ns
t
AVAV
= 45ns
t
AVAV
= 55ns
All Inputs Don’t Care, V
CC
= max
W
≥
(V
CC
– 0.2V)
All Others Cycling, CMOS Levels
t
AVAV
= 25ns, E
≥
V
IH
t
AVAV
= 35ns, E
≥
V
IH
t
AVAV
= 45ns, E
≥
V
IH
t
AVAV
= 55ns, E
≥
V
IH
E
≥
(V
CC
– 0.2V)
All Others V
IN
≤
0.2V or
≥
(V
CC
– 0.2V)
V
CC
= max
V
IN
= V
SS
to V
CC
V
CC
= max
V
IN
= V
SS
to V
CC
, E or G
≥
V
IH
All Inputs
All Inputs
I
OUT
= – 4mA
I
OUT
= 8mA
I
CC2
c
I
CC3
b
I
SB1
d
Average V
CC
Current during
STORE
Average V
CC
Current at t
AVAV
= 200ns
5V, 25°C, Typical
Average V
CC
Current
(Standby, Cycling TTL Input Levels)
I
SB2
d
I
ILK
I
OLK
V
IH
V
IL
V
OH
V
OL
T
A
V
CC
Standby Current
(Standby, Stable CMOS Input Levels)
Input Leakage Current
Off-State Output Leakage Current
Input Logic “1” Voltage
Input Logic “0” Voltage
Note a: Output Logic “1” Voltage
Output Logic “0” Voltage
Operating Temperature
Note b: I
CC1
and I
CC3
are dependent on output loading and cycle rate. The specified values are obtained with outputs unloaded.
Note c: I
CC2
is the average current required for the duration of the
STORE
cycle (t
STORE
) .
Note d: E
≥
V
IH
will not produce standby current levels until any nonvolatile cycle in progress has timed out.
AC TEST CONDITIONS
Input Pulse Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 3V
Input Rise and Fall Times
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤
5ns
Input and Output Timing Reference Levels . . . . . . . . . . . . . . . 1.5V
Output Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Figure 1
5.0V
480 Ohms
OUTPUT
255 Ohms
CAPACITANCE
e
SYMBOL
C
IN
C
OUT
PARAMETER
Input Capacitance
Output Capacitance
(T
A
= 25
°
C, f = 1.0MHz)
MAX
8
7
UNITS
pF
pF
CONDITIONS
ΔV
= 0 to 3V
ΔV
= 0 to 3V
30 pF
INCLUDING
SCOPE AND
FIXTURE
Note e: These parameters are guaranteed but not tested.
Figure 1: AC Output Loading
March 2006
2
Document Control # ML0006 rev 0.2
STK10C68
SRAM READ CYCLES #1 & #2
SYMBOLS
NO.
1
2
3
4
5
6
7
8
9
10
11
PARAMETER
#1, #2
t
ELQV
t
AVAV
f
t
AVQV
g
t
GLQV
t
AXQX
g
t
ELQX
t
EHQZ
h
t
GLQX
t
GHQZ
h
t
ELICCH
e
t
EHICCL
d, e
Alt.
t
ACS
t
RC
t
AA
t
OE
t
OH
t
LZ
t
HZ
t
OLZ
t
OHZ
t
PA
t
PS
Chip Enable Access Time
Read Cycle Time
Address Access Time
Output Enable to Data Valid
Output Hold after Address Change
Chip Enable to Output Active
Chip Disable to Output Inactive
Output Enable to Output Active
Output Disable to Output Inactive
Chip Enable to Power Active
Chip Disable to Power Standby
0
25
0
10
0
35
5
5
10
0
10
0
45
25
25
10
5
5
10
0
12
0
55
MIN
MAX
25
35
35
15
5
5
12
0
12
MIN
MAX
35
45
45
20
5
5
12
MIN
MAX
45
55
55
25
MIN
MAX
55
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
STK10C68-25
STK10C68-35
(V
CC
= 5.0V
±
10%)
STK10C68-45
STK10C68-55
UNITS
Note f: W must be high during SRAM READ cycles and low during SRAM WRITE cycles. NE must be high during entire cycle.
Note g: I/O state assumes E, G < V
IL
, W > V
IH
, and NE
≥
V
IH
; device is continuously selected.
Note h: Measured + 200mV from steady state output voltage.
SRAM READ CYCLE #1:
Address Controlled
f, g
t
AVAV
ADDRESS
5
3
2
t
AVQV
DATA VALID
t
AXQX
DQ (DATA OUT)
SRAM READ CYCLE #2:
E Controlled
f
t
AVAV
ADDRESS
t
ELQV
E
t
ELQX
t
EHQZ
7
6
1
2
t
EHICCL
11
G
4
t
GLQV
t
GHQZ
9
t
GLQX
DQ (DATA OUT)
t
ELICCH
I
CC
STANDBY
10
DATA VALID
8
ACTIVE
March 2006
3
Document Control # ML0006 rev 0.2
STK10C68
SRAM WRITE CYCLES #1 & #2
SYMBOLS
NO.
#1
12
13
14
15
16
17
18
19
20
21
t
AVAV
t
WLWH
t
ELWH
t
DVWH
t
WHDX
t
AVWH
t
AVWL
t
WHAX
t
WLQZ
h, i
t
WHQX
#2
t
AVAV
t
WLEH
t
ELEH
t
DVEH
t
EHDX
t
AVEH
t
AVEL
t
EHAX
Alt.
t
WC
t
WP
t
CW
t
DW
t
DH
t
AW
t
AS
t
WR
t
WZ
t
OW
Write Cycle Time
Write Pulse Width
Chip Enable to End of Write
Data Set-up to End of Write
Data Hold after End of Write
Address Set-up to End of Write
Address Set-up to Start of Write
Address Hold after End of Write
Write Enable to Output Disable
Output Active after End of Write
5
PARAMETER
MIN
25
20
20
10
0
20
0
0
10
5
MAX
MIN
35
25
25
12
0
25
0
0
13
5
MAX
MIN
45
30
30
15
0
30
0
0
14
5
MAX
MIN
55
45
45
30
0
45
0
0
15
MAX
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
STK10C68-25
STK10C68-35
(V
CC
= 5.0V
±
10%)
STK10C68-45
STK10C68-55
UNITS
Note i:
Note j:
If W is low when E goes low, the outputs remain in the high-impedance state.
E or W must be
≥
V
IH
during address transitions. NE
≥
V
IH
.
SRAM WRITE CYCLE #1:
W Controlled
j
t
AVAV
ADDRESS
t
ELWH
E
14
19
12
t
WHAX
t
AVWH
t
AVWL
W
t
WLWH
15
13
18
17
t
DVWH
DATA IN
t
WLQZ
DATA OUT
PREVIOUS DATA
HIGH IMPEDANCE
20
DATA VALID
16
t
WHDX
t
WHQX
21
SRAM WRITE CYCLE #2:
E Controlled
j
t
AVAV
ADDRESS
t
AVEL
E
18
14
19
12
t
ELEH
t
EHAX
t
AVEH
W
t
WLEH
16
13
17
t
DVEH
DATA IN
HIGH IMPEDANCE
DATA VALID
15
t
EHDX
DATA OUT
March 2006
4
Document Control # ML0006 rev 0.2
STK10C68
STORE
INHIBIT/POWER-UP
RECALL
SYMBOLS
NO.
Standard
22
23
24
25
t
RESTORE
t
STORE
V
SWITCH
V
RESET
Power-up
RECALL
Duration
STORE
Cycle Duration
Low Voltage Trigger Level
Low Voltage Reset Level
PARAMETER
(V
CC
= 5.0V + 10%)
STK10C68
UNITS NOTES
MIN
MAX
550
10
4.0
4.5
3.6
μs
ms
V
V
k
Note k: t
RESTORE
starts from the time V
CC
rises above V
SWITCH
.
STORE
INHIBIT/POWER-UP
RECALL
V
CC
V
SWITCH
25
V
RESET
24
5V
STORE
INHIBIT
POWER-UP
RECALL
22
t
RESTORE
DQ (DATA OUT)
POWER-UP
RECALL
BROWN OUT
STORE
INHIBIT
NO
RECALL
(V
CC
DID NOT GO
BELOW V
RESET
)
BROWN OUT
STORE
INHIBIT
NO
RECALL
(V
CC
DID NOT GO
BELOW V
RESET
)
BROWN OUT
STORE
INHIBIT
RECALL
WHEN
V
CC
RETURNS
ABOVE V
SWITCH
March 2006
5
Document Control # ML0006 rev 0.2
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