INTRODUCTION this application note, describe SST28xF040A used place SS

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INTRODUCTION this application note, describe SST28xF040A used place SS

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Migration from SST28xF040 SST28xF040A
INTRODUCTION this application note, describe SST28xF040A used place SST28xF040 with hardware software changes. SST28xF040 Small-Sector Flash memory product. These products available three voltage ranges SST28SF040 (5V), SST28LF040 (3.0-3.6V) SST28VF040 (2.7-3.6V). introducing version these products called SST28xF040A, which will replace above products. These products available voltage ranges SST28SF040A (5V) SST28VF040A (2.73.6V). SST28SF040A replaces SST28SF040, while SST28VF040A replaces SST28LF040 SST28VF040. Software comparison between SST28SF040 SST28SF040A SST28SF040 SST28SF040A have same software command set, well same Manufacturer (0xBF) Device ID(0x04). result, firmware written SST28SF040 used with SST28SF040A. Hardware comparison between SST28SF040 SST28SF040A SST28SF040 SST28SF040A have same packages pinouts, board layout change needed designing SST28SF040A place SST28SF040. SST28SF040 offered speeds 120ns 150ns, while SST28SF040A offered speeds 90ns 120ns. result, SST28SF040A used substitute SST28xF040. Erase Program timing parameters both these products same. parameters Address protect setup time (TPAS) looks different because referenced differently. SST28SF040, TPAS defined time constraint between address being valid falling edge CE#, specified 0ns. SST28SF040A, TPAS defined time constraint between address being valid rising edge CE#, instead, specified 40ns. This difference referencing TPAS doesn't impact compatibility SST28SF040A with SST28SF040. Another parameter Address protect hold time (TPAH) 50ns SST28SF040 SST28SF040A. Since SST28SF040A shorter TPAH, used substitute SST28SF040. addition above, SST28SF040A product from previous mask-set required pull-up resistors WE#. newer SST28SF040A, which starts sampling late April, 2000), does require pullup resistors WE#. However, system been designed with earlier SST28SF040A using pull-up resistors, newer SST28SF040A used that system without modifications. Software comparison between SST28LF/VF040 SST28VF040A SST28LF040 SST28VF040 have same software commands SST28VF040A. They also share same Manufacturer (0xBF) Device ID(0x04). result, firmware written SST28LF/VF040 used with SST28VF040A. Hardware comparisons between SST28LF/VF040 SST28VF040A SST28LF040 offered speeds 200ns 250ns, SST28VF040 offered speeds 250ns 300ns. SST28VF040A offered speeds 200ns 250ns. Since SST28VF040A offers same speeds SST28LF040 wider voltage range, used substitute SST28LF040. Also, since SST28VF040A offers higher speeds than SST28VF040, same voltage range, also used substitute SST28VF040. Erase Program timing parameters these products same. parameters Address protect setup time (TPAS) looks different because referenced differently. SST28LF/VF040, TPAS defined time constraint between address being valid falling edge CE#, specified 0ns. SST28VF040A, TPAS defined time constraint between address being valid rising edge CE#, instead, specified 40ns. This difference referencing TPAS doesn't impact compatibility SST28SF040A with SST28SF040. Another parameter Address protect hold time (TPAH) 100ns SST28LF/VF040 SST28VF040A. Since SST28VF040A shorter TPAH, used substitute SST28LF/VF040. Conclusion SST28xF040A used replace SST28xF040, with changes board layout software.
2000 Silicon Storage Technology, Inc. logo SuperFlash registered trademarks Silicon Storage Technology, Inc. 226-01 4/00
trademark Silicon Storage Technology, Inc. These specifications subject change without notice.
Migration from SST28xF040 SST28xF040A
Application Note
TPCP TPCH
ADDRESS TPAS
1823
1820 TPAH
1822
0418
041B
0419
040A
NOTE: ADDRESSES LATCHED INTERNALLY RISING EDGE KEPT TIME. KEPT TIME. FIRST HIGH BOTH TOGGLED. ABOVE ADDRESS VALUES HEX. ADDRESSES "DON'T CARE"
F01.0
FIGURE SOFTWARE DATA PROTECT TIMING DIAGRAM SST28SF040 SST28LF040 SST28VF040
TPCP TPCH
ADDRESS
1823
1820 TPAH
1822
0418
041B
0419
040A
TPAS
NOTE: ADDRESSES LATCHED INTERNALLY RISING EDGE KEPT TIME. KEPT TIME. FIRST HIGH BOTH TOGGLED. ABOVE ADDRESS VALUES HEX. ADDRESSES "DON'T CARE"
F02.0
FIGURE SOFTWARE DATA PROTECT TIMING DIAGRAM SST28SF040A SST28VF040A
Silicon Storage Technology, Inc. 1171 Sonora Court Sunnyvale, 94086 Telephone 408-735-9110 408-735-9036 www.SuperFlash.com www.ssti.com Literature FaxBack 888-221-1178, International 732-544-2873
2000 Silicon Storage Technology, Inc.
226-01 4/00

INTRODUCTION this application note, describe SST28xF040A used place SS

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