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M28C64-A25NS3T 데이터시트(PDF) 7 Page - STMicroelectronics |
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7 / 24 page 7/24 M28C64 Table 5. Chip Erase AC Characteristics1 for M28C64 and M28C64-xxW (TA = 0 to 70 °C or –40 to 85 °C or –40 to 125 °C; VCC = 4.5 to 5.5 V) (TA = 0 to 70 °C or –40 to 85 °C; VCC = 2.7 to 3.6 V) Note: 1. Sampled only, not 100% tested. Symbol Parameter Test Condition Min. Max. Unit tELWL Chip Enable Low to Write Enable Low G= VCC +7V 1 µs tWHEH Write Enable High to Chip Enable High G = VCC +7V 0 ns tWLWH2 Write Enable Low to Write Enable High G= VCC +7V 10 ms tGLWH Output Enable Low to Write Enable High G= VCC +7V 1 µs tWHRH Write Enable High to Write Enable Low G = VCC +7V 3 ms throughout this write operation: it is inverted while the internal write operation is underway, and is inverted back to its original value once the operation is complete. Toggle bit (DQ6). The device offers another way for determining when the internal write cycle is completed. During the internal Erase/Write cycle, DQ6 toggles from ’0’ to ’1’ and ’1’ to ’0’ (the first read value being ’0’) on subsequent attempts to read any byte of the memory. When the internal write cycle is complete, the toggling is stopped, and the values read on DQ7-DQ0 are those of the addressed memory byte. This indicates that the device is again available for new Read and Write operations. Page Load Timer Status bit (DQ5). An internal timer is used to measure the period between successive Write operations, up to tWLQ5H (defined in Table 10A to Table 10C). The DQ5 line is held low to show when this timer is running (hence showing that the device has received one write operation, and is waiting for the next). The DQ5 line is held high when the counter has overflowed (hence showing that the device is now starting the internal write to the memory array). Ready/Busy pin. The RB pin is an open drain output that is held low during the erase/write cycle, and that is released (allowed to float) at the completion of the programming cycle. Figure 7. Chip Erase AC Waveforms (M28C64 and M28C64-xxW) AI01484B E G W tWLWH2 tELWL tGLWH tWHRH tWHEH |
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