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M59P064110N1T Datasheet(PDF) 7 Page - STMicroelectronics |
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M59P064110N1T Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 24 page  7/24 M59PW064 SIGNAL DESCRIPTIONS See Figure 2., Logic Diagram, and Table 1., Signal Names, for a brief overview of the sig- nals connected to this device. Address Inputs (A0-A21). The Address Inputs select the cells in the memory array to access dur- ing Bus Read operations. During Bus Write opera- tions they control the commands sent to the Command Interface of the Program Controller. Data Inputs/Outputs (DQ0-DQ7). The Data In- puts/Outputs output the data stored at the selected address during a Bus Read operation. During Bus Write operations they represent the command sent to the Command Interface of the Program Controller. When reading the Status Register they report the status of the ongoing algorithm. Data Inputs/Outputs (DQ8-DQ15). The Data In- puts/Outputs output the data stored at the selected address during a Bus Read operation. During Bus Write operations the Command Register does not use these bits. When reading the Status Register these bits should be ignored. Chip Enable (E). The Chip Enable, E, activates the memory, allowing Bus Read operations to be performed. It also controls the Bus Write opera- tions, when VPP is in the VHH range. Output Enable (G). The Output Enable, G, con- trols the Bus Read operations of the memory. It also allows Bus Write operations, when VPP is in the VHH range. VCC Supply Voltage. The VCC Supply Voltage supplies the power for Read operations. A 0.1µF capacitor should be connected between the VCC Supply Voltage pin and the VSS Ground pin to decouple the current surges from the power supply. The PCB track widths must be sufficient to carry the currents required during program opera- tions, ICC3. VPP Program Supply Voltage. VPP is both a power supply and Write Protect pin. The two func- tions are selected by the voltage range applied to the pin. When the VPP is in the VHH range (see Table 10., DC Characteristics, for the relevant values) the Program/Erase operation is enabled. During such operations the VPP must be stable in the VHH range. If the VPP is kept under the VHH range, particularly in the voltage range 0V to 3.6V, any Program/ Erase operation is disabled or stopped. Note that VPP must not be left floating or uncon- nected as the device may become unreliable. VSS Ground. The VSS Ground is the reference for all voltage measurements. |
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