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M28010-20BA6T Datasheet(PDF) 4 Page - STMicroelectronics |
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M28010-20BA6T Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 23 page  M28010 4/23 Table 3. Operating Modes 1 Note: 1. X = VIH or VIL. Mode E G W DQ0-DQ7 Read VIL VIL VIH Data Out Write VIL VIH VIL Data In Stand-by / Write Inhibit VIH X X Hi-Z Write Inhibit X X VIH Data Out or Hi-Z Write Inhibit X VIL X Data Out or Hi-Z Output Disable X VIH X Hi-Z Write Enable (W). The Write Enable input controls whether the addressed location is to be read, from or written to. DEVICE OPERATION In order to prevent data corruption and inadvertent write operations, an internal VCC comparator inhibits the Write operations if the VCC voltage is lower than VWI (see Table 4A to Table 4C). Once the voltage applied on the VCC pin goes over the VWI threshold (VCC>VWI), write access to the memory is allowed after a time-out tPUW,as specified in Table 4A to Table 4C. Further protection against data corruption is offered by the E and W low pass filters: any glitch, on the E and W inputs, with a pulse width less than 10 ns (typical) is internally filtered out to prevent inadvertent write operations to the memory. Table 4A. Power-Up Timing 1 for M28010 (5V range) (TA = –40 to 85 °C; VCC = 4.5 to 5.5 V) Note: 1. Sampled only, not 100% tested. Table 4B. Power-Up Timing1 for M28010-W (3V range) (TA = –40 to 85 °C; VCC = 2.7 to 3.6 V) Note: 1. Sampled only, not 100% tested. Table 4C. Power-Up Timing1 for M28010-R (2V range) (TA = –40 to 85 °C; VCC = 1.8 to 2.4 V) Note: 1. Sampled only, not 100% tested. Symbol Parameter Min. Max. Unit tPUR Time Delay to Read Operation 5 ms tPUW Time Delay to Write Operation (once VCC ≥ VWI) 5ms VWI Write Inhibit Threshold 3.0 4.2 V Symbol Parameter Min. Max. Unit tPUR Time Delay to Read Operation 5 ms tPUW Time Delay to Write Operation (once VCC ≥ VWI)5 ms VWI Write Inhibit Threshold 2.0 2.6 V Symbol Parameter Min. Max. Unit tPUR Time Delay to Read Operation 5 ms tPUW Time Delay to Write Operation (once VCC ≥ VWI)5 ms VWI Write Inhibit Threshold 1.2 1.7 V |
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