DS1222 Dallas, DS1222 Datasheet
DS1222
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DS1222 Summary of contents
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... Optional 16-pin SOIC surface mount package DESCRIPTION The DS1222 BankSwitch Chip is a CMOS circuit designed to select one of 16 memory banks under software control. Memory bank switching allows for an increase in memory capacity without additional address lines. Continuous blocks of memory are enabled by selecting proper memory bank through a pattern recognition sequence on four address inputs ...
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... P switching is achieved by matching a predefined pattern stored within the DS1222 with a 16-bit sequence received on four address inputs. Prior to entering the 16-bit pattern, which sets the bank switch, a read cycle of 1111 on address inputs AW through AZ should be executed to guarantee that pattern entry starts with bit 0 ...
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... MAX UNITS 10%) CC MAX UNITS +1 MAX UNITS 10%) CC MAX UNITS DS1222 NOTES NOTES NOTES NOTES 2 ...
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... OUTPUT LOAD Figure 1 TIMING DIAGRAM-ACCESS TO BANK SWITCH DS1222 ...