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SST31LF021E Datasheet(PDF) 5 Page - Silicon Storage Technology, Inc |
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SST31LF021E Datasheet(HTML) 5 Page - Silicon Storage Technology, Inc |
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5 / 24 page  EOL Data Sheet 2 Mbit Flash + 1 Mbit SRAM ComboMemory SST31LF021 / SST31LF021E 5 ©2007 Silicon Storage Technology, Inc. S71137-06-EOL 05/07 Product Identification The Product Identification mode identifies the devices as either SST31LF021 or SST31LF021E and the manufac- turer as SST. This mode may be accessed by hardware or software operations. The hardware device ID Read opera- tion is typically used by a programmer to identify the correct algorithm for the SST31LF021/021E flash memory banks. Users may wish to use the software Product Identification operation to identify the part (i.e., using the device ID) when using multiple manufacturers in the same socket. For details, see Table 3 for hardware operation or Table 4 for software operation, Figure 11 for the software ID entry and read timing diagram and Figure 18 for the ID entry com- mand sequence flowchart. Product Identification Mode Exit/Reset In order to return to the standard Read mode, the Software Product Identification mode must be exited. Exiting is accomplished by issuing the Exit ID command sequence, which returns the device to the Read operation. Please note that the software reset command is ignored during an internal Program or Erase operation. See Table 4 for soft- ware command codes, Figure 12 for timing waveform and Figure 18 for a flowchart. Design Considerations SST recommends a high frequency 0.1 µF ceramic capac- itor to be placed as close as possible between VDD and VSS, e.g., less than 1 cm away from the VDD pin of the device. Additionally, a low frequency 4.7 µF electrolytic capacitor from VDD to VSS should be placed within 1 cm of the VDD pin. TABLE 1: PRODUCT IDENTIFICATION Address Data Manufacturer’s ID 0000H BFH Device ID SST31LF021 0001H 18H SST31LF021E 0001H 19H T1.4 1137 |
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