SIMTEK STK15C88

STK15C88
32Kx8 PowerStore nvSRAM
FEATURES
DESCRIPTION
• 25, 45 ns Read Access & R/W Cycle Time
The Simtek STK15C88 is a 256Kb fast static RAM
with a non-volatile Quantum Trap storage element
included with each memory cell.
• Unlimited Read/Write Endurance
• Pin compatible with industry standard SRAMs
• Automatic Non-volatile STORE on Power Loss
• Automatic RECALL to SRAM on Power Up
• Non-Volatile STORE or RECALL under
Software Control
The SRAM provides the fast access & cycle times,
ease of use and unlimited read & write endurance of
a normal SRAM.
Data transfers automatically to the non-volatile storage cells when power loss is detected (the STORE
operation). On power up, data is automatically
restored to the SRAM (the RECALL operation). Both
STORE and RECALL operations are also available
under software control.
• Unlimited RECALL Cycles
• 1 Million Store Cycles
• 100-Year Non-volatile Data Retention
• Single 5V +10% Power Supply
PowerStore nvSRAM products depend on the intrinsic system capacitance to maintain system power
long enough for an automatic store on power loss. If
the power ramp from 5 volts to 3.6 volts is faster
than 10 ms, consider our 14C88 or 16C88 for more
reliable operation.
• Commercial and Industrial Temperatures
• 28-pin 300-mil and 330 mil SOIC Packages
(RoHS-Compliant)
The Simtek nvSRAM is the first monolithic non-volatile memory to offer unlimited writes and reads. It is
the highest performance, most reliable non-volatile
memory available.
BLOCK DIAGRAM
A5
A6
A7
A8
A9
A11
A12
A13
A14
ROW DECODER
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
INPUT BUFFERS
QUANTUM TRAP
512 x 512
STORE
STATIC RAM
ARRAY
512 X 512
STORE/
RECALL
CONTROL
RECALL
SOFTWARE
DETECT
A13 – A0
COLUMN I/O
COLUMN DEC
A 0 A 1 A 2 A 3 A 4 A10
G
E
W
This product conforms to specifications per the
terms of Simtek standard warranty. The product
has completed Simtek internal qualification testing
and has reached production status.
1
Document Control #ML0016 Rev 2.0
Jan, 2008
STK15C88
PIN CONFIGURATIONS
A14
1
28
VCC
A12
A7
2
27
W
3
26
A13
A6
A5
A4
A3
4
25
24
A8
5
6
23
A2
8
21
A1
A0
DQ0
9
20
E
10
19
11
18
DQ7
DQ6
DQ1
DQ2
VSS
12
17
13
16
14
15
7
(TOP)
22
A9
A11
G
A10
DQ5
DQ4
DQ3
28 Pin 300 mil SOIC
28 Pin 330 mil SOIC
PIN DESCRIPTIONS
Pin Name
I/O
Description
A14-A0
Input
Address: The 15 address inputs select one of 32,768 bytes in the nvSRAM array
DQ7-DQ0
I/O
Data: Bi-directional 8-bit data bus for accessing the nvSRAM
E
Input
Chip Enable: The active low E input selects the device
W
Input
Write Enable: The active low W enables data on the DQ pins to be written to the address
location latched by the falling edge of E
G
Input
Output Enable: The active low G input enables the data output buffers during read cycles.
De-asserting G high caused the DQ pins to tri-state.
VCC
Power Supply
Power: 5.0V, +10%
VSS
Power Supply
Ground
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Jan, 2008
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STK15C88
ABSOLUTE MAXIMUM RATINGSa
Voltage on Input Relative to Ground . . . . . . . . . . . . . –0.5V to 7.0V
Voltage on Input Relative to VSS . . . . . . . . . . –0.6V to (VCC + 0.5V)
Voltage on DQ0-7 . . . . . . . . . . . . . . . . . . . . . . –0.5V to (VCC + 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 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.
(VCC = 5.0V ± 10%)
DC CHARACTERISTICS
COMMERCIAL
SYMBOL
INDUSTRIAL
PARAMETER
UNITS
MIN
ICC1b
Average VCC Current
ICC2c
Average VCC Current during STORE
ICC3b
Average VCC Current at tAVAV = 200ns
5V, 25°C, Typical
ICC4c
Average VCAP Current during
AutoStore Cycle
ISB1d
MAX
MIN
NOTES
MAX
97
70
100
70
mA
mA
tAVAV = 25ns
tAVAV = 45ns
3
3
mA
All Inputs Don’t Care, VCC = max
10
10
mA
W ≥ (V CC – 0.2V)
All Others Cycling, CMOS Levels
2
2
mA
Average VCC Current
(Standby, Cycling TTL Input Levels)
30
22
31
23
mA
mA
tAVAV = 25ns, E ≥ VIH
tAVAV = 45ns, E ≥ VIH
ISB2d
VCC Standby Current
(Standby, Stable CMOS Input Levels)
1.5
1.5
mA
E ≥ (V CC – 0.2V)
All Others VIN ≤ 0.2V or ≥ (VCC – 0.2V)
IILK
Input Leakage Current
±1
±1
μA
VCC = max
VIN = VSS to VCC
IOLK
Off-State Output Leakage Current
±5
±5
μA
VCC = max
VIN = VSS to VCC, E or G ≥ VIH
VIH
Input Logic “1” Voltage
2.2
VCC + .5
2.2
VCC + .5
V
All Inputs
VIL
Input Logic “0” Voltage
VSS – .5
0.8
VSS – .5
0.8
V
All Inputs
VOH
Output Logic “1” Voltage
V
IOUT = – 4mA
VOL
Output Logic “0” Voltage
0.4
V
IOUT = 8mA
TA
Operating Temperature
85
°C
2.4
2.4
0.4
0
70
– 40
All Inputs Don’t Care
Note b: ICC1 and ICC3 are dependent on output loading and cycle rate. The specified values are obtained with outputs unloaded.
Note c: ICC2 and ICC4 are the average currents required for the duration of the respective STORE cycles (tSTORE ) .
Note d: E ≥ VIH 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
CAPACITANCE
SYMBOL
e
5.0V
(TA = 25°C, f = 1.0MHz)
PARAMETER
MAX
UNITS
CIN
Input Capacitance
5
pF
ΔV = 0 to 3V
COUT
Output Capacitance
7
pF
ΔV = 0 to 3V
480 Ohms
CONDITIONS
OUTPUT
255 Ohms
Note e: These parameters are guaranteed but not tested.
30 pF
INCLUDING
SCOPE AND
FIXTURE
Figure 1: AC Output Loading
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Jan, 2008
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STK15C88
SRAM READ CYCLES #1 & #2
(VCC = 5.0V ± 10%)
SYMBOLS
STK15C88-25
STK15C88-45
PARAMETER
NO.
#1, #2
UNITS
Alt.
MIN
MAX
MIN
MAX
1
tELQV
tACS
Chip Enable Access Time
2
tAVAVf, tELEHf
tRC
Read Cycle Time
25
45
3
tAVQVg
tAA
Address Access Time
25
45
ns
4
tGLQV
tOE
Output Enable to Data Valid
10
20
ns
5
tAXQXg
tOH
Output Hold after Address Change
5
5
6
tELQX
tLZ
Address Change or Chip Enable to Output Active
5
5
7
tEHQZh
tHZ
Address Change or Chip Disable to Output Inactive
8
tGLQX
tOLZ
Output Enable to Output Active
9
tGHQZh
tOHZ
Output Disable to Output Inactive
10
tELICCHe
tPA
Chip Enable to Power Active
11
tEHICCLd, e
tPS
Chip Disable to Power Standby
25
45
10
10
0
25
3
tAVQV
tAXQX
DATA VALID
SRAM READ CYCLE #2: E and G Controlledf
ADDR ESS
2
E
27
6
t ELQ X
29
t EHAX
11
t EHI CC L
7
t EHQ Z
3
t AV QV
G
8
9
t GH Q Z
4
t G L QV
tG L Q X
DQ (D ATA OUT)
DAT A VAL ID
10
t ELI CC H
AC T IVE
I CC
ST AND BY
Document Control #ML0016 Rev 2.0
Jan, 2008
4
ns
ns
45
2
tAVAV
ns
ns
0
ADDRESS
t E LE H
1
tEL Q V
ns
15
SRAM READ CYCLE #1: Address Controlledf, g
DQ (DATA OUT)
ns
0
Note f: W must be high during SRAM READ cycles and low during SRAM WRITE cycles.
Note g: I/O state assumes E, G < VIL and W > VIH; device is continuously selected.
Note h: Measured + 200mV from steady state output voltage.
5
ns
15
0
ns
ns
STK15C88
(VCC = 5.0V ± 10%)
SRAM WRITE CYCLES #1 & #2
SYMBOLS
STK15C88-25
NO.
STK15C88-45
PARAMETER
#1
#2
Alt.
UNITS
MIN
MAX
MIN
MAX
12
tAVAV
tAVAV
tWC
Write Cycle Time
25
45
ns
13
tWLWH
tWLEH
tWP
Write Pulse Width
20
30
ns
14
tELWH
tELEH
tCW
Chip Enable to End of Write
20
30
ns
15
tDVWH
tDVEH
tDW
Data Set-up to End of Write
10
15
ns
16
tWHDX
tEHDX
tDH
Data Hold after End of Write
0
0
ns
17
tAVWH
tAVEH
tAW
Address Set-up to End of Write
20
30
ns
18
tAVWL
tAVEL
tAS
Address Set-up to Start of Write
0
0
ns
19
tWHAX
tEHAX
tWR
Address Hold after End of Write
0
20
tWLQZh, i
tWZ
Write Enable to Output Disable
21
tWHQX
tOW
Output Active after End of Write
Note i:
Note j:
0
10
5
5
If W is low when E goes low, the outputs remain in the high-impedance state.
E or W must be ≥ VIH during address transitions.
SRAM WRITE CYCLE #1: W Controlledj
12
tAVAV
ADDRESS
19
tWHAX
14
tELWH
E
17
tAVWH
18
tAVWL
13
tWLWH
W
15
tDVWH
DATA IN
DATA OUT
16
tWHDX
DATA VALID
20
tWLQZ
HIGH IMPEDANCE
PREVIOUS DATA
21
tWHQX
SRAM WRITE CYCLE #2: E Controlledj
12
tAVAV
ADDRESS
14
tELEH
18
tAVEL
19
tEHAX
E
17
tAVEH
13
tWLEH
W
15
tDVEH
DATA IN
DATA OUT
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Jan, 2008
16
tEHDX
DATA VALID
HIGH IMPEDANCE
5
ns
15
ns
ns
STK15C88
(VCC = 5.0V ± 10%)
AutoStore™/POWER-UP RECALL
SYMBOLS
STK15C88
NO.
PARAMETER
Standard
UNITS NOTES
MIN
MAX
μs
22
tRESTORE
Power-up RECALL Duration
550
23
tSTORE
STORE Cycle Duration
10
ms
24
VSWITCH
Low Voltage Trigger Level
4.5
V
25
VRESET
Low Voltage Reset Level
3.6
V
4.0
Note k: tRESTORE starts from the time VCC rises above VSWITCH.
AutoStore™/POWER-UP RECALL
VCC
5V
24
VSWITCH
25
VRESET
AutoStore™
23
tSTORE
POWER-UP RECALL
22
tRESTORE
W
DQ (DATA OUT)
POWER-UP
RECALL
BROWN OUT
NO STORE DUE TO
NO SRAM WRITES
BROWN OUT
AutoStore
BROWN OUT
AutoStore
NO RECALL
(VCC DID NOT GO
BELOW VRESET)
NO RECALL
(VCC DID NOT GO
BELOW VRESET)
RECALL WHEN
VCC RETURNS
ABOVE VSWITCH
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6
k
g
STK15C88
SOFTWARE STORE/RECALL MODE SELECTION
E
W
A13 - A0 (hex)
MODE
I/O
NOTES
H
0E38
31C7
03E0
3C1F
303F
0FC0
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Nonvolatile STORE
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
l, m
H
0E38
31C7
03E0
3C1F
303F
0C63
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Nonvolatile RECALL
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
l, m
L
L
Note l:
The six consecutive addresses must be in the order listed. W must be high during all six consecutive E controlled cycles to enable a nonvolatile cycle.
Note m: While there are 15 addresses on the STK15C88, only the lower 14 are used to control software modes.
(VCC = 5.0V ± 10%)
SOFTWARE STORE/RECALL CYCLEn, o
NO.
SYMBOLS
STK15C88-25
STK15C88-45
MIN
MIN
PARAMETER
UNITS
MAX
MAX
26
tAVAV
STORE/RECALL Initiation Cycle Time
25
45
ns
27
tAVELn
Address Set-up Time
0
0
ns
28
tELEHn
Clock Pulse Width
20
30
ns
29
tELAXg, n
Address Hold Time
20
20
ns
30
tRECALL
RECALL Duration
20
20
μs
Note n: The software sequence is clocked on the falling edge of E controlled READs without involving G (double clocking will abort the sequence).
See application note: MA0002 http://www.simtek.com/attachments/AppNote02.pdf.
Note o: The six consecutive addresses must be in the order listed in the Software STORE/RECALL Mode Selection Table: (0E38, 31C7, 03E0, 3C1F,
303F, 0FC0) for a STORE cycle or (0E38, 31C7, 03E0, 3C1F, 303F, 0C63) for a RECALL cycle. W must be high during all six consecutive
cycles.
SOFTWARE STORE/RECALL CYCLE: E Controlledo
26
26
tAVAV
ADDRESS
tAVAV
ADDRESS #1
27
tAVEL
ADDRESS #6
28
tELEH
E
29
tELAX
23
tSTORE
DQ (DATA
DATA VALID
DATA VALID
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Jan, 2008
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30
/ tRECALL
HIGH IMPEDANCE
STK15C88
nvSRAM OPERATION
The STK15C88 is a versatile memory chip that provides several modes of operation. The STK15C88
can operate as a standard 32K x 8 SRAM. It has a
32K x 8 nonvolatile element shadow to which the
SRAM information can be copied, or from which the
SRAM can be updated in nonvolatile mode.
NOISE CONSIDERATIONS
Note that the STK15C88 is a high-speed memory
and so must have a high-frequency bypass capacitor of approximately 0.1μF connected between VCC
and VSS, using leads and traces that are as short as
possible. As with all high-speed CMOS ICs, normal
careful routing of power, ground and signals will help
prevent noise problems.
SRAM READ
The STK15C88 performs a READ cycle whenever E
and G are low and W is high. The address specified
on pins A0-14 determines which of the 32,768 data
bytes will be accessed. When the READ is initiated
by an address transition, the outputs will be valid
after a delay of tAVQV (READ cycle #1). If the READ is
initiated by E or G, the outputs will be valid at tELQV or
at tGLQV, whichever is later (READ cycle #2). The data
outputs will repeatedly respond to address changes
within the tAVQV access time without the need for transitions on any control input pins, and will remain valid
until another address change or until E or G is
brought high.
SRAM WRITE
A WRITE cycle is performed whenever E and W are
low. The address inputs must be stable prior to
entering the WRITE cycle and must remain stable
until either E or W goes high at the end of the cycle.
The data on the common I/O pins DQ0-7 will be written into the memory if it is valid tDVWH before the end
of a W controlled WRITE or tDVEH before the end of an
E controlled WRITE.
It is recommended that G be kept high during the
entire WRITE cycle to avoid data bus contention on
the common I/O lines. If G is left low, internal circuitry will turn off the output buffers tWLQZ after W
goes low.
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Jan, 2008
8
SOFTWARE NONVOLATILE STORE
The STK15C88 software STORE cycle is initiated by
executing sequential READ cycles from six specific
address locations. During the STORE cycle an erase
of the previous nonvolatile data is first performed,
followed by a program of the nonvolatile elements.
The program operation copies the SRAM data into
nonvolatile memory. Once a STORE cycle is initiated, further input and output are disabled until the
cycle is completed.
Because a sequence of READs from specific
addresses is used for STORE initiation, it is important that no other READ or WRITE accesses intervene in the sequence or the sequence will be
aborted and no STORE or RECALL will take place.
To initiate the software STORE cycle, the following
READ sequence must be performed:
1.
2.
3.
4.
5.
6.
Read address
Read address
Read address
Read address
Read address
Read address
0E38 (hex)
31C7 (hex)
03E0 (hex)
3C1F (hex)
303F (hex)
0FC0 (hex)
Valid READ
Valid READ
Valid READ
Valid READ
Valid READ
Initiate STORE cycle
The software sequence must be clocked with E controlled READs.
Once the sixth address in the sequence has been
entered, the STORE cycle will commence and the
chip will be disabled. It is important that READ cycles
and not WRITE cycles be used in the sequence,
although it is not necessary that G be low for the
sequence to be valid. After the tSTORE cycle time has
been fulfilled, the SRAM will again be activated for
READ and WRITE operation.
SOFTWARE NONVOLATILE RECALL
A software RECALL cycle is initiated with a sequence
of READ operations in a manner similar to the software STORE initiation. To initiate the RECALL cycle,
the following sequence of READ operations must be
performed:
1.
2.
3.
4.
5.
6.
Read address
Read address
Read address
Read address
Read address
Read address
0E38 (hex)
31C7 (hex)
03E0 (hex)
3C1F (hex)
303F (hex)
0C63 (hex)
Valid READ
Valid READ
Valid READ
Valid READ
Valid READ
Initiate RECALL cycle
STK15C88
Internally, RECALL is a two-step procedure. First,
the SRAM data is cleared, and second, the nonvolatile information is transferred into the SRAM cells.
After the tRECALL cycle time the SRAM will once again
be ready for READ and WRITE operations. The
RECALL operation in no way alters the data in the
nonvolatile elements. The nonvolatile data can be
recalled an unlimited number of times.
AutoStoreTM OPERATION
The STK15C88 uses the intrinsic system capacitance to perform an automatic STORE on power
down. As long as the system power supply takes at
least tSTORE to decay from VSWITCH down to 3.6V, the
STK15C88 will safely and automatically store the
SRAM data in nonvolatile elements on power down.
In order to prevent unneeded STORE operations,
automatic STOREs will be ignored unless at least
one WRITE operation has taken place since the
most recent STORE or RECALL cycle. Softwareinitiated STORE cycles are performed regardless of
whether a WRITE operation has taken place. Additional information may be found in applications note
“Applying the STK11C88, STK15C88 and
STK16C88 32K nvSRAM.”
POWER-UP RECALL
To help avoid this situation, a 10K Ohm resistor
should be connected either between W and system
VCC or between E and system VCC.
HARDWARE PROTECT
The STK15C88 offers hardware protection against
inadvertent STORE operation and SRAM WRITEs
during low-voltage conditions. When VCC < VSWITCH,
all software STORE operations and SRAM WRITEs
are inhibited.
LOW AVERAGE ACTIVE POWER
The STK15C88 draws significantly less current
when it is cycled at times longer than 50ns. Figure 2
shows the relationship between ICC and READ cycle
time. Worst-case current consumption is shown for
both CMOS and TTL input levels (commercial temperature range, VCC = 5.5V, 100% duty cycle on chip
enable). Figure 3 shows the same relationship for
WRITE cycles. If the chip enable duty cycle is less
than 100%, only standby current is drawn when the
chip is disabled. The overall average current drawn
by the STK15C88 depends on the following items:
1) CMOS vs. TTL input levels; 2) the duty cycle of
chip enable; 3) the overall cycle rate for accesses;
4) the ratio of READs to WRITEs; 5) the operating
temperature; 6) the VCC level; and 7) I/O loading.
During power up, or after any low-power condition
(VCC < VRESET), an internal RECALL request will be
latched. When VCC once again exceeds the sense
voltage of VSWITCH, a RECALL cycle will automatically
be initiated and will take tRESTORE to complete.
If the STK15C88 is in a WRITE state at the end of
power-up RECALL, the SRAM data will be corrupted.
100
Average Active Current (mA)
Average Active Current (mA)
100
80
60
40
TTL
20
CMOS
100
150
Cycle Time (ns)
TTL
40
CMOS
20
50
200
Figure 2: ICC (max) Reads
Document Control #ML0016 Rev 2.0
Jan, 2008
60
0
0
50
80
100
150
Cycle Time (ns)
Figure 3: ICC (max) Writes
9
200
STK15C88
BEST PRACTICES
nvSRAM products have been used effectively for
over 15 years. While ease-of-use is one of the product’s main system values, experience gained working with hundreds of applications has resulted in the
following suggestions as best practices:
• The non-volatile cells in an nvSRAM are programmed on the test floor during final test and
quality assurance. Incoming inspection routines
at customer or contract manufacturer’s sites will
sometimes reprogram these values. Final NV patterns are typically repeating patterns of AA, 55,
00, FF, A5, or 5A. End product’s firmware should
not assume an NV array is in a set programmed
state. Routines that check memory content values to determine first time system configuration,
Document Control #ML0016 Rev 2.0
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10
cold or warm boot status, etc. should always program a unique NV pattern (e.g., complex 4-byte
pattern of 46 E6 49 53 hex or more random
bytes) as part of the final system manufacturing
test to ensure these system routines work consistently.
• Power up boot firmware routines should rewrite
the nvSRAM into the desired state. While the
nvSRAM is shipped in a preset state, best practice is to again rewrite the nvSRAM into the
desired state as a safeguard against events that
might flip the bit inadvertently (program bugs,
incoming inspection routines, etc.).
STK15C88
ORDERING INFORMATION
STK15C88 - N F 45 I TR
Packaging Options
Blank = Tube
TR = Tape and Reel
Temperature Range
Blank = Commercial (0 to 70°C)
I = Industrial (–40 to 85°C)
Access Time
25 = 25ns
45 = 45ns
Lead Finish
F = 100% Sn (Matte Tin)
Package
S = Plastic 28-pin 330 mil SOIC
N = Plastic 28-pin 300 mil SOIC
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STK15C88
ORDERING CODES
Part Number
Description
Access Times
STK15C88-SF25
5V 32Kx8 PowerStore nvSRAM SOP28-330
25 ns access time
Temperature
Commercial
STK15C88-SF45
5V 32Kx8 PowerStore nvSRAM SOP28-330
45 ns access time
Commercial
STK15C88-NF25
5V 32Kx8 PowerStore nvSRAM SOP28-300
25 ns access time
Commercial
STK15C88-NF45
5V 32Kx8 PowerStore nvSRAM SOP28-300
45 ns access time
Commercial
STK15C88-SF25TR
5V 32Kx8 PowerStore nvSRAM SOP28-330
25 ns access time
Commercial
STK15C88-SF45TR
5V 32Kx8 PowerStore nvSRAM SOP28-330
45 ns access time
Commercial
STK15C88-NF25TR
5V 32Kx8 PowerStore nvSRAM SOP28-300
25 ns access time
Commercial
STK15C88-NF45TR
5V 32Kx8 PowerStore nvSRAM SOP28-300
45 ns access time
Commercial
STK15C88-SF25I
5V 32Kx8 PowerStore nvSRAM SOP28-330
25 ns access time
Industrial
STK15C88-SF45I
5V 32Kx8 PowerStore nvSRAM SOP28-330
45 ns access time
Industrial
STK15C88-NF25I
5V 32Kx8 PowerStore nvSRAM SOP28-300
25 ns access time
Industrial
STK15C88-NF45I
5V 32Kx8 PowerStore nvSRAM SOP28-300
45 ns access time
Industrial
STK15C88-SF25ITR
5V 32Kx8 PowerStore nvSRAM SOP28-330
25 ns access time
Industrial
STK15C88-SF45ITR
5V 32Kx8 PowerStore nvSRAM SOP28-330
45 ns access time
Industrial
STK15C88-NF25ITR
5V 32Kx8 PowerStore nvSRAM SOP28-300
25 ns access time
Industrial
STK15C88-NF45ITR
5V 32Kx8 PowerStore nvSRAM SOP28-300
45 ns access time
Industrial
Document Control #ML0016 Rev 2.0
Jan, 2008
12
STK15C88
PACKAGE DRAWINGS
28 Pin 300 mil SOIC
(
0.292 7.42
0.300 7.59
)
0.400 10.16
0.410 10.41
(
)
Pin 1
Index
.050 (1.27)
BSC
(
0.701 17.81
0.711 18.06
)
0.097 2.46
0.104 2.64
(
)
0.090 2.29
0.094 2.39
(
0.014 0.35
0.019 0.48
(
0.009 0.23
0.013 0.32
(
)
(
0.005 0.12
0.012 0.29
)
0°
8°
)
(
0.024 0.61
Document Control #ML0016 Rev 2.0
Jan, 2008
13
)
)
DIM = INCHES
DIM = mm
MIN
MAX
MIN
)
( MAX
STK15C88
28 Pin 330 mil SOIC
0.713
0.733
( 18.11
)
18.62
0.112
(2.845)
0.020
0.014
( 0.508
)
0.356
0.050 (1.270)
0.103
0.093
0.336
0.326
0.004
(0.102)
( 2.616
)
2.362
( 8.534
)
8.280
0.477
0.453
( 12.116
)
11.506
Pin 1
0.014
0.008
10°
0°
( 0.356
)
0.203
0.044
0.028
MIN
MAX
DIM = INCHES
DIM = mm
Document Control #ML0016 Rev 2.0
Jan, 2008
MIN
)
( MAX
14
( 1.117
)
0.711
STK15C88
Document Revision History
Revision
Date
Summary
0.0
December 2002
0.1
September 2003
Added lead-free lead finish
0.2
March 2006
Removed DIP packages, Removed 35ns Speed Grade, Remove leaded lead finish
0.3
February 2007
Add fast power-down slew rate information
Add Tape Reel Ordering Options
Add Product Ordering Code Listing
Add Package Drawings
Reformat Entire Document
0.4
July 2007
extend definition of tHZ (#7)
update fig. SRAM READ CYCLE #2, SRAM WRITE CYCLE #1, Note l and Note n to clarify
product usage
2.0
January 2008
Page 4: in SRAM Read Cycles #1 & #2 table, revised description for tELQX and tEHQZ and
changed Symbol #2 to tELEH for Read Cycle Time; updated SRAM Read Cycle #2 timing
diagram and changed title to add G controlled.
Page 10: added best practices section.
Page 12: added access times column to the Ordering codes.
SIMTEK STK15C88 Datasheet, January 2008
Copyright 2008, Simtek Corporation. All rights reserved.
This datasheet may only be printed for the expressed use of Simtek Customers. No part of the datasheet may be reproduced in any other
form or means without the express written permission from Simtek Corporation. The information contained in this publication is believed to be
accurate, but changes may be made without notice. Simtek does not assume responsibility for, or grant or imply any warranty, including
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE regarding this information, the product or its use. Nothing herein constitutes a license, grant or transfer of any rights to any Simtek patent, copyright, trademark, or other proprietary right.
Document Control #ML0016 Rev 2.0
Jan, 2008
15