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HM-6561 pdf datasheet (256 x 4

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The HM-6561/883 is a 256 x 4 staTIc CMOS RAM fabricatedusing self-aligned silicon gate technology. Synchronous circuitdesign techniques are employed to achieve high performanceand low power operaTIon.On-chip latches are provided for address and data outputsallowing efficient interfacing with microprocessor systems.The data output buffers can be forced to a high impedancestate for use in expanded memory arrays. The data inputs andoutputs are mulTIplexed internally for common I/O bus compaTIbility.The HM-6561/883 is a fully static RAM and may bemaintained in any state for an indefinite period of time. Dataretention supply voltage and supply current are guaranteedover temperature.
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