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rm57l843: Memory Devices

Part Number: RM57L843

Hello

I'm using 12 SRAM on three different banks of my processor. I'm to calculate current requirements that either I need a buffer or not.  One Cs enables 04 SRAM at one time.

As the Adress bus, and control signals. For current calculations, of writing or reading on one bank, should I add the input capacitance (address pins) of all other 08 SRAM (whose cs is high) or only consider their leakage current?  I believe leakage current is very low and input capacitance needed to account while reading or writing on high speed. If the pins are going into high impedance when CS is not active what it means in terms of current requirement.

Regards;

  • Raheel,

    What is the load on the address and data lines of the selected memory chips? This will determine the current that is consumed by the IO being driven at the MCU level.

    In reference to you high impedance question, which device are you indicating goes to high impedance mode? The SRAM chip or the MCU?
  • Thanks Chuck

    Load is around 6pf per chip and there are 04 chips selected at one time. Data bus is shared with other banks and address bus is commonly shared and with other bus.

    When the CS is not active of any particular bank, it means that the load capacitance of those banks will not be accumulated or it will be counted.? Does inactive CS means there is only leakage current?

    With reference to high impedance mode, SRAM chip will go into high impedance.

    Regards;