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M95640-S Datasheet(PDF) 9 Page - STMicroelectronics |
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M95640-S Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 42 page 9/42 M95640, M95320 OPERATING FEATURES Power-Up When the power supply is turned on, VCC rises from VSS to VCC. During this time, the Chip Select (S) must be al- lowed to follow the VCC voltage. It must not be al- lowed to float, but should be connected to VCC via a suitable pull-up resistor. As a built in safety feature, Chip Select (S) 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 op- eration. Power On Reset: VCC Lock-Out Write Protect In order to prevent inadvertent Write operations during Power-up, each device include a Power On Reset (POR) circuit. At Power-up, the device will not respond to any instruction until VCC has reached the Power On Reset threshold voltage. This threshold is lower than the VCC min operating voltage defined in Tables 10, 11, 12 and 13. Similarly, as soon as VCC drops from the normal operating voltage, below the Power On Reset threshold voltage, the device stops responding to any instruction sent to it. Prior to selecting and issuing instructions to the memory, a valid stable VCC voltage must be ap- plied. This voltage must remain stable and valid until the end of the transmission of the instruction and, for a Write instruction, until the completion o the internal write cycle (tW). Power-down At Power-down, the device must be deselected. Chip Select (S) should be allowed to follow the voltage applied on VCC. Active Power and Standby Power Modes When Chip Select (S) is Low, the device is select- ed, and in the Active Power mode. The device consumes ICC, as specified in Table 16. to Table 20.. When Chip Select (S) is High, the device is dese- lected. If an Erase/Write cycle is not currently in progress, the device then goes in to the Standby Power mode, and the device consumption drops to ICC1. Hold Condition The Hold (HOLD) signal is used to pause any se- rial communications with the device without reset- ting the clocking sequence. During the Hold condition, the Serial Data Output (Q) is high impedance, and Serial Data Input (D) and Serial Clock (C) are Don’t Care. To enter the Hold condition, the device must be selected, with Chip Select (S) Low. Normally, the device is kept selected, for the whole duration of the Hold condition. Deselecting the de- vice while it is in the Hold condition, has the effect of resetting the state of the device, and this mech- anism can be used if it is required to reset any pro- cesses that had been in progress. The Hold condition starts when the Hold (HOLD) signal is driven Low at the same time as Serial Clock (C) already being Low (as shown in Figure 6.). The Hold condition ends when the Hold (HOLD) signal is driven High at the same time as Serial Clock (C) already being Low. Figure 6. also shows what happens if the rising and falling edges are not timed to coincide with Serial Clock (C) being Low. |
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