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M95256DW6TG Datasheet(PDF) 10 Page - STMicroelectronics |
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M95256DW6TG Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 44 page Signal description M95256, M95256-W, M95256-R 10/44 3.6 Write Protect (W) The main purpose of this input signal is to freeze the size of the area of memory that is protected against Write instructions (as specified by the values in the BP1 and BP0 bits of the Status Register). This pin must be driven either high or low, and must be stable during all write instructions. 3.7 VSS ground VSS is the reference for the VCC supply voltage. 3.8 Supply voltage (VCC) 3.8.1 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 Table 7, Table 8 and Table 9.). 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). 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. 3.8.2 Power-up conditions When the power supply is turned on, VCC continuously rises from VSS to VCC. During this time, the Chip Select (S) line is not allowed to float but should follow the VCC voltage, it is therefore recommended to connect the S line to VCC via a suitable pull-up resistor (see Figure 13). In addition, the Chip Select (S) input offers a built-in safety feature, as the S input is edge- sensitive as well as level-sensitive: after power-up, the device does not become selected until a falling edge has first been detected on Chip Select (S). This ensures that Chip Select (S) must have been high, prior to going low to start the first operation. The VCC rise time must not vary faster than 1 V/µs. 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. 3.8.3 Device Reset In order to prevent inadvertent write operations during power-up (continuous rise in VCC), a power on reset (POR) circuit is included. At power-up, the device does not respond to any instruction until VCC has reached the power on reset threshold voltage (this threshold is lower than the minimum VCC operating voltage defined in Table 7, Table 8 and Table 9). When VCC passes over the POR threshold, the device is reset and enters the following state: ● Standby Power mode |
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