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STK16CA8-W45I Datenblatt(PDF) 9 Page - Simtek Corporation |
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STK16CA8-W45I Datenblatt(HTML) 9 Page - Simtek Corporation |
9 / 12 page STK16CA8 September 2003 9 Document Control # ML0023 rev 0.1 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 soft- ware STORE initiation. To initiate the RECALL cycle, the following sequence of E controlled READ opera- tions must be performed: 1. Read address 4E38 (hex) Valid READ 2. Read address B1C7 (hex) Valid READ 3. Read address 83E0 (hex) Valid READ 4. Read address 7C1F (hex) Valid READ 5. Read address 703F (hex) Valid READ 6. Read address 4C63 (hex) Initiate RECALL cycle 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 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 nonvolatile elements. The nonvolatile data can be recalled an unlimited number of times. HARDWARE PROTECT The STK16CA8 offers hardware protection against inadvertent STORE operation and SRAM WRITEs dur- ing low-voltage conditions. When V CCX < VSWITCH, all externally initiated STORE operations and SRAM WRITE s will be inhibited. PREVENTING STORES The AutoStore™ function can be disabled on the fly by initiating an AutoStore Inhibit sequence. A sequence of read operations is performed in a man- ner similar to the software STORE initiation. To ini- tiate the AutoStore Inihibit sequence, the following sequence of E controlled read operations must be performed: 1. Read address 4E38 (hex) Valid READ 2. Read address B1C7 (hex) Valid READ 3. Read address 83E0 (hex) Valid READ 4. Read address 7C1F (hex) Valid READ 5. Read address 703F (hex) Valid READ 6. Read address 8B45 (hex) AutoStore Inhibit Once the AutoStore™ inhibit has been initiated, it will remain active until an AutoStore™ inhibit off sequence has been performed, regardless of device power cycles. The AutoStore Inhibit can be disabled by initiating an AutoStore Inhibit Off sequence. A sequence of read operations is performed in a manner similar to the software RECALL initiation. To initiate the AutoStore Inhibit Off sequence, the following sequence of E controlled read operations must be performed: 1. Read address 4E38 (hex) Valid READ 2. Read address B1C7 (hex) Valid READ 3. Read address 83E0 (hex) Valid READ 4. Read address 7C1F (hex) Valid READ 5. Read address 703F (hex) Valid READ 6. Read address 4B46 (hex) AutoStore Inhibit Off LOW AVERAGE ACTIVE POWER The STK16CA8 draws significantly less current when it is cycled at times longer than 50ns. Figure 3 shows the relationship between I CC and READ cycle time. Worst-case current consumption is shown for both CMOS and TTL input levels (commercial tem- perature range, V CC = 3.6V, 100% duty cycle on chip enable). Figure 4 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 STK16CA8 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. |
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Ähnliche Beschreibung - STK16CA8-W45I |
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