(China (Mainland))
Product Summary
The DS1742W-120 is a Y2KC Nonvolatile Timekeeping RAM. User access to all registers within the DS1742W-120 is accomplished with a bytewide interface as shown in Figure 1. The Real Time Clock (RTC) information and control bits reside in the eight uppermost RAM locations. The DS1742W-120 registers contain 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.
Parametrics
DS1742W-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: -20℃ to +70℃; (4)Active Supply Current ICC: 50 mA; (5)Read Cycle Time tRC: 100 ns.
Features
DS1742W-120 features: (1)Integrated NV SRAM, real time clock, crystal, power-fail control circuit and lithium energy source; (2)Clock registers are accessed identical to the static RAM. These registers are resident in the eight top RAM locations; (3)Century byte register; (4)Totally nonvolatile with over 10 years of operation in the absence of power; (5)BCD coded century, year, month, date, day, hours, minutes, and seconds with automatic leap year compensation valid up to the year 2100; (6)Battery voltage level indicator flag; (7)Power-fail write protection allows for ±10% VCC power supply tolerance; (8)Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time; (9)Standard JEDEC bytewide 2k x 8 static RAM pinout; (10)Quartz accuracy ±1 minute a month @ 25℃, factory calibrated.
Diagrams
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 DS1742W-120 |
Maxim Integrated Products |
Real Time Clock Timekeeping NV RAM |
Data Sheet |
Negotiable |
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DS1742W-120+ |
Maxim Integrated Products |
Real Time Clock Timekeeping NV RAM |
Data Sheet |
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