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M93C-56RMN6P 데이터시트(PDF) 6 Page - STMicroelectronics |
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M93C-56RMN6P 데이터시트(HTML) 6 Page - STMicroelectronics |
6 / 31 page M93C86, M93C76, M93C66, M93C56, M93C46 6/31 MEMORY ORGANIZATION The M93Cx6 memory is organized either as bytes (x8) or as words (x16). If Organization Select (ORG) is left unconnected (or connected to VCC) the x16 organization is selected; when Organiza- tion Select (ORG) is connected to Ground (VSS) the x8 organization is selected. When the M93Cx6 is in stand-by mode, Organization Select (ORG) should be set either to VSS or VCC for minimum power consumption. Any voltage between VSS and VCC applied to Organization Select (ORG) may increase the stand-by current. INTERNAL DEVICE RESET In order to prevent inadvertent Write operations during Power-up, a Power On Reset (POR) circuit is included. At Power-up and Power-down, the device must not be selected (that is, the Chip Select Input (S) must be driven Low) until the supply voltage reaches the operating voltage VCC (as defined in Tables 9, 10 and 11). During Power-up (phase during which VCC is low- er than VCCmin but increases continuously), the device will not respond to any instruction until VCC has reached the Power On Reset threshold volt- age (this threshold is lower than the minimum VCC operating voltage defined in DC AND AC PARAM- ETERS). Once VCC has passed the POR thresh- old, the device is reset. Prior to selecting the memory and issuing instruc- tions to it, a valid and stable VCC voltage must be applied. 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). During Power-down (phase during which VCC de- creases continuously), as soon as VCC drops from the normal operating voltage below the Power On Reset threshold voltage, the device stops re- sponding to any instruction sent to it. ACTIVE POWER AND STANDBY POWER MODES When Chip Select (S) is High, the device is select- ed and in the Active Power mode. It consumes ICC, as specified in Tables 15, 16, 17, 18 and 19. When Chip Select (S) is Low, the device is dese- lected. If no Erase/Write cycle is in progress when Chip Select goes Low, the device enters the Standby Power mode, and the power consumption drops to ICC1. For the M93Cx6 devices (5V range) the POR threshold voltage is around 3V. For the M93Cx6- W (3V range) and M93Cx6-R (2V range) the POR threshold voltage is around 1.5V. |
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