(Hong Kong)
Product Summary
The DS1743-120 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 8k x 8 non-volatile static RAM. User access to all registers within the DS1743-70 is accomplished with a bytewide interface. The Real Time Clock (RTC) information and control bits reside in the eight uppermost RAM locations. The RTC register DS1743-120 contains century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the day of the month and leap year are made automatically. The RTC clock register DS1743-120 is double buffered to avoid access of incorrect data that can occur during clock update cycles.
Parametrics
DS1743-120 absolute maximum ratings: (1)Voltage on Any Pin Relative to Ground: -0.3V to +6.0V; (2)Operating Temperature: 0℃ to 70℃; (3)Storage Temperature: -40℃ to +85℃.
Features
DS1743-120 features: (1)Clock registers are accessed identical to the static RAM. These registers are resident in the eight top RAM locations.; (2)Century byte register; (3)Totally nonvolatile with over 10 years of operation in; (4)the absence of power; (5)BCD coded century, year, month, date, day, hours,; (6)minutes, and seconds with automatic leap year compensation valid up to the year 2100; (7)Battery voltage level indicator flag; (8)Power-fail write protection allows for ±10% VCC power supply tolerance; (9)Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time.
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