DS1222 BankSwitch Chip www.
dalsemi.
com FEATURES Provides bank switching for 16 banks of memory Bank switching is software-controlled by a pattern recognition sequence on four address inputs Automatically sets all 16 banks off on power-up Bank switching logic allows only one bank on at a time Custom recognition patterns are available to prevent unauthorized access Full ±10% operating range Low-power CMOS circuitry Can be used to expand the address range of microprocessors and decoders Optional 16-pin SOIC surface mount package PIN ASSIGNMENT CEI PFI AW AX AY AZ GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC CEO BS1 BS2 BS3 BS4 NC CEI NC PFI AW AX AY AZ GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V...

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