DS1251W-120IND

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The DS1251W-120IND is an integrated clock device from Dallas Semiconductor that provides continuous timing functions for a wide range of applications. It has been specifically designed for applications that demand utmost accuracy and reliability. This device combines a real-time clock/calendar and counters for day-of-week, month, day, hour, minute, and second. It also offers a range of options for alarm settings, operation modes and programmable frequency outputs.

The DS1251W-120IND is typically used in mobile communications, industrial automation, and automotive systems. It can be utilized for applications such as vehicle event logging and activity logging, motor control, and timing circuits. Its versatile features and its excellent accuracy make it a popular choice for engineers designing systems that require precise timing.

The DS1251W-120IND operates by using an oscillating quartz crystal resonator. It has a frequency accuracy between 0 and 3.2 ppm, providing clock accuracy on the order of a few nanoseconds per day. A stable quartz oscillator provides the time source, while a fully integrated multiplexed four-cell static RAM stores the internal values of time and date. This RAM holds the seconds, minutes, hours, date, month, and year. The real-time counters offer 59 interrupt outputs for specialized functions such as RTC, wake-up, selection count, and alarming. It also has a frequency output from an internal oscillator that can be used with other logic to generate frequencies from low frequency to low-speed clock signals.

The DS1251W-120IND supports a wide range of settings within its user interface. For instance, it supports an auto clock adjust feature, which automatically compensates for the inaccurate crystal frequency. It also supports an auto day-of-week calculator, which is used to calculate the day of the week if the date is known and vice versa. Other features include alarm settings, temperature compensation, leap-year correction and power-saving mode.

The device can be programmed in various modes via its 16-pin configuration interface. This includes serial interfaces such as SPI, UART, I2C and three-wire. Additionally, the DS1251W-120IND supports a watchdog timer and a reset input to ensure system safety and reliability. It offers excellent timekeeping accuracy and stability while consuming minimal power.

Overall, the DS1251W-120IND is a high precision real-time clock/calendar with a wide range of features. It offers excellent accuracy and is ideal for use in automotive, industrial automation and mobile communications applications that require precise timing.

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