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 ICC and READ/WRITE cycle time. Worst case current consumption is shown for commercial temperature range, VCC=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 | 0x4E38 | Valid READ |
Read Address | 0xB1C7 | Valid READ |
Read Address | 0x83E0 | Valid READ |
Read Address | 0x7C1F | Valid READ |
Read Address | 0x703F | Valid READ |
Read Address | 0x8B45 | AutoStore Disable |
The AutoStore can be
Read Address | 0x4E38 | Valid READ |
Read Address | 0xB1C7 | Valid READ |
Read Address | 0x83E0 | Valid READ |
Read Address | 0x7C1F | Valid READ |
Read Address | 0x703F | Valid READ |
Read Address | 0x4B46 | AutoStore Enable |
If the AutoStore function is disabled or
Document Number: | Page 13 of 16 |
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