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M24128T-FCU6T Datasheet(PDF) 8 Page - STMicroelectronics |
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M24128T-FCU6T Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 36 page  Signal description M24128T-FCU 8/36 DocID028396 Rev 1 2 Signal description 2.1 Serial Clock (SCL) SCL is an input. The signal applied on the SCL input is used to strobe the data available on SDA(in) and to output the data on SDA(out). 2.2 Serial Data (SDA) SDA is an input/output used to transfer data in or data out of the device. SDA(out) is an open drain output that may be wire-OR’ed with other open drain or open collector signals on the bus. A pull-up resistor must be connected from Serial Data (SDA) to VCC (Figure 9 indicates how to calculate the value of the pull-up resistor). 2.3 VSS (ground) VSS is the reference for the VCC supply voltage. 2.4 Supply voltage (VCC) 2.4.1 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 from10 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). 2.4.2 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. 2.4.3 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 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). |
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