MM58167 NSC [National Semiconductor], MM58167 Datasheet
MM58167
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MM58167 Summary of contents
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... MM58167B Microprocessor Real Time Clock General Description The MM58167B is a low threshold metal gate CMOS circuit that functions as a real time clock in bus oriented microproc- essor systems The device includes an addressable real time counter 56 bits of RAM and two interrupt outputs A POWER DOWN input allows the chip to be disabled from ...
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Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Voltage at All Pins Operating Temperature Electrical Characteristics V Parameter Supply ...
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Functional Description Real Time Counter The real time counter is divided into 4-bit digits with 2 digits being accessed during any read or write cycle Each digit represents a BCD number and is defined in Table I Any unused bits ...
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Functional Description (Continued) TABLE II Clock RAM Bit Map for Alarm Interrupt Everyday Address Function Milliseconds Hundredths and Tenths of Seconds Seconds Minutes ...
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Functional Description (Continued) logical zero ) When switching V to the standby or power DD down mode the POWER DOWN input should logical zero at least 1 s before V is switched When switching DD V all ...
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Functional Description (Continued) Standby Interrupt Typical Characteristics Interrupt Timing Symbol Parameter t Status Register Clock to INTERRUPT OUTPUT INTON (Pin 13) High (Note 1) t Compare Valid to STANDBY INTERRUPT ...
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Write Cycle Timing Symbol Parameter t Address Valid to Write Strobe AW t Chip Select to Write Strobe CSW t Data Valid before Write Strobe DW t Write Strobe to Ready Strobe WRY t ...
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... Note 5 A ground line or ground plane guard trace should be included between pins 9 and 10 to insure the oscillator is not disturbed by the address line FIGURE 5 Typical Connection Diagram Note 6 Must use 8238 or equivalent logic to insure advanced I OW pulse so that the ready output of the MM58167B is valid by the end of 2 during the T2 microcycle ...
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... Block Diagram Physical Dimensions inches (millimeters) FIGURE 7 Molded Dual-In-Line Package (N) Order Number MM58167BN NS Package Number N24A 11070– 10 ...
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... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications PCC Package (V) Order Number MM58167BV NS Package Number V28A 2 A critical component is any component of a life ...