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M34E04B-FMC9TGH Datasheet(PDF) 9 Page - STMicroelectronics |
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M34E04B-FMC9TGH Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 35 page  DocID028428 Rev 1 9/35 M34E04B Signal description 34 This voltage must remain stable and valid until the end of the transmission of the instruction and, for a Write instruction, until the completion of the internal write cycle (tW). 2.4.2 Power-up conditions The VCC voltage has to rise continuously from 0 V up to the minimum VCC operating voltage defined in Table 8. 2.4.3 Device reset In order to prevent inadvertent write operations during power-up, a power-on reset (POR) circuit is included. At power-up, the device does not respond to any instruction until VCC reaches the internal reset threshold voltage (this threshold is lower than the minimum VCC operating voltage defined in Table 8). When VCC passes over the POR threshold, the device is reset and enters the Standby Power mode. However, the device must not be accessed until VCC reaches a valid and stable VCC voltage within the specified [VCC(min), VCC(max)] range. In a similar way, during power-down (continuous decrease in VCC), as soon as VCC drops below the power-on reset threshold voltage, the device stops responding to any instruction sent to it. 2.4.4 Power-down conditions During power-down (continuous decrease in VCC), the device must be in Standby Power mode (mode reached after decoding a Stop condition, assuming that there is no internal write cycle in progress). |
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