The M48T58-70PC1 is a non-volatile Static RAM and Real-time Clock provides a highly integrated battery-backed memory and real-time clock solution. The M48T58 is a non-volatile pin and function equivalent to any JEDEC standard 8kB x 8 SRAM. It also easily fits into many ROM, EPROM and EEPROM sockets, providing the non-volatility of PROMs without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed. The static memory array and the quartz controlled clock oscillator of the M48T58/Y are integrated on one silicon chip. The two circuits are interconnected at the upper eight memory locations to provide user accessible BYTEWIDE? clock information in the bytes with addresses 1FF8h-1FFFh. The clock locations contain the century, year, month, date, day, hour, minute and second in 24-hour BCD format (except for the century). Corrections for 28, 29 (leap year - valid until 2100), 30 and 31 day months are made automatically.
- Integrated, ultra-low power SRAM, real-time clock, power-fail control circuit and battery
- BYTEWIDE? RAM-like clock access
- BCD coded year, month, day, date, hours, minutes and seconds
- Frequency test output for real-time clock
- Automatic power-fail chip deselect and WRITE protection
- WRITE protect voltage
时钟与计时
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