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M24C08-F Datasheet(PDF) 9 Page - STMicroelectronics |
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M24C08-F Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 40 page  DocID023924 Rev 3 9/40 M24C08-W M24C08-R M24C08-F Signal description 39 2.6 Supply voltage (VCC) 2.6.1 Operating supply voltage (VCC) Prior to selecting the memory and issuing instructions to it, a valid and stable VCC voltage within the specified [VCC(min), VCC(max)] range must be applied (see Operating conditions in Section 8: DC and AC parameters). In order to secure a stable DC supply voltage, it is recommended to decouple the VCC line with a suitable capacitor (usually of the order of 10 nF to 100 nF) close to the VCC/VSS package pins. 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). 2.6.2 Power-up conditions The VCC voltage has to rise continuously from 0 V up to the minimum VCC operating voltage (see Operating conditions in Section 8: DC and AC parameters) and the rise time must not vary faster than 1 V/µs. 2.6.3 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 has reached the internal reset threshold voltage. This threshold is lower than the minimum VCC operating voltage (see Operating conditions in Section 8: DC and AC parameters). 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 DC voltage within the specified [VCC(min), VCC(max)] range (see Operating conditions in Section 8: DC and AC parameters). In a similar way, during power-down (continuous decrease in VCC), the device must not be accessed when VCC drops below VCC(min). When VCC drops below the threshold voltage, the device stops responding to any instruction sent to it. 2.6.4 Power-down conditions During power-down (continuous decrease in VCC), the device must be in the Standby Power mode (mode reached after decoding a Stop condition, assuming that there is no internal write cycle in progress). |
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