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STK16C88 Datasheet(PDF) 9 Page - Simtek Corporation

Part # STK16C88
Description  32Kx8 AutoStore nvSRAM
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Manufacturer  SIMTEK [Simtek Corporation]
Direct Link  http://www.simtek.com
Logo SIMTEK - Simtek Corporation

STK16C88 Datasheet(HTML) 9 Page - Simtek Corporation

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STK16C88
February, 2007
Document Control #ML0018 Rev 0.3
1.
Read address
0E38 (hex)
Valid READ
2.
Read address
31C7 (hex)
Valid READ
3.
Read address
03E0 (hex)
Valid READ
4.
Read address
3C1F (hex)
Valid READ
5.
Read address
303F (hex)
Valid READ
6.
Read address
0FC0 (hex)
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 t
STORE
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.
Read address
0E38 (hex)
Valid READ
2.
Read address
31C7 (hex)
Valid READ
3.
Read address
03E0 (hex)
Valid READ
4.
Read address
3C1F (hex)
Valid READ
5.
Read address
303F (hex)
Valid READ
6.
Read address
0C63 (hex)
Initiate RECALL cycle
Internally, RECALL is a two-step procedure. First,
the SRAM data is cleared, and second, the nonvola-
tile information is transferred into the SRAM cells.
After the t
RECALL 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
non-volatile storage elements. The nonvolatile data
can be recalled an unlimited number of times.
HARDWARE PROTECT
The STK16C88 offers hardware protection against
inadvertent STORE operation and SRAM WRITEs
during low-voltage conditions. When V
CC < VSWITCH,
all software STORE operations and SRAM WRITEs
are inhibited.
LOW AVERAGE ACTIVE POWER
The STK16C88 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 tem-
perature 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 STK16C88 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.
Figure 2: ICC (max) Reads
0
20
40
60
80
100
50
100
150
200
Cycle Time (ns)
TTL
CMOS
Figure 3: ICC (max) Writes
0
20
40
60
80
100
50
100
150
200
Cycle Time (ns)
TTL
CMOS


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