STK14CA8 Datasheet, PDF (13/16 Pages) List of Unclassifed Manufacturers – 128K x 8 AutoStoreTM nvSRAM QuantumTrapTM CMOS Nonvolatile Static RAM

STK14CA8
Low Average Active Power
CMOS technology provides the STK14CA8 with the benefit of
power supply current that scales with cycle time. Less current is
drawn as the memory cycle time becomes longer than 50 ns.
Figure 16 shows the relationship between I_CC and
READ/WRITE cycle time. Worst case current consumption is
shown for commercial temperature range, V_CC=3.6V, and chip
enable at maximum frequency. Only standby current is drawn
when the chip is disabled. The overall average current drawn by
the STK14CA8 depends on the following items:
1. The duty cycle of chip enable
2. The overall cycle rate for operations
3. The ratio of READs to WRITEs
4. The operating temperature
5. The VCC Level
6. I/O Loading
Figure 16. Current vs Cycle Time
Preventing AutoStore
The AutoStore function can be disabled by initiating an
AutoStore Disable sequence. A sequence of READ operations
is performed in a manner similar to the software STORE initi-
ation. To initiate the AutoStore Disable sequence, the following
sequence of E controlled or G controlled READ operations must
be performed:
Read Address
Read Address
Read Address
Read Address
Read Address
Read Address
0x4E38
0xB1C7
0x83E0
0x7C1F
0x703F
0x8B45
Valid READ
Valid READ
Valid READ
Valid READ
Valid READ
AutoStore Disable
The AutoStore can be re-enabled by initiating an AutoStore
Enable sequence. A sequence of READ operations is performed
in a manner similar to the software RECALL initiation. To initiate
the AutoStore Enable sequence, the following sequence of E
controlled or G controlled READ operations must be performed:
Read Address
Read Address
Read Address
Read Address
Read Address
Read Address
0x4E38
0xB1C7
0x83E0
0x7C1F
0x703F
0x4B46
Valid READ
Valid READ
Valid READ
Valid READ
Valid READ
AutoStore Enable
If the AutoStore function is disabled or re-enabled, a manual
STORE operation (Hardware or Software) must be issued to
save the AutoStore state through subsequent power down
cycles. The part comes from the factory with AutoStore enabled.
Document Number: 001-51592 Rev. **
Page 13 of 16
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