DS1390U-3+T&R

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The DS1390U-3+T&R is part of the extended range of standard, inexpensive, real time clocks (RTC) made by Maxim Integrated. It is an enhanced version of the DS1390 based on improved architecture and new features.The DS1390U-3+T&R includes a 32kHz crystal, an oscillator circuit, and a non-volatile memory and is capable of providing up to two alarms, one of which can be used as a watchdog timer. Other features include a tamper event switch, open-drain reset, temperature compensation, a reset pin, and a battery monitoring pin.

Applications for the DS1390U-3+T&R include telecommunications, instrumentation, consumer electronics, medical devices, data loggers, embedded test systems, energy management, industrial and process control, and consumer electronics.

The DS1390U-3+T&R is based on a precision CMOS oscillator using a closely trimmed and temperature compensated 32kHz crystal which can be interconnected to an external watch crystal. The oscillator and the memory sections of the clock are segregated and are powered independently of each other. The RTC is powered by an external battery which is monitored by a dedicated pin.

The DS1390U-3+T&R also includes provisions for a tamper switch which can be connected to one of the alarm or interrupt pins. When the switch is triggered, the alarm or interrupt pin will go low, indicating that a tamper event has occurred. In addition, the reset pin can be used to reset the clock and the watchdog timer. The reset pin can also be used to re-enable the oscillator after it has been disabled due to a power-on reset or other condition.

The DS1390U-3+T&R also features a reset circuit which monitors the battery condition and can disable the clock if the battery voltage falls below a specified level. This prevents data loss due to a low battery. The reset circuit also enables the oscillator and allows normal operation when the battery voltage returns to the specified level. The reset circuit is extensible to any interrupt source, giving users the ability to customize the reset circuitry.

The DS1390U-3+T&R\'s operating temperature range and power supply requirements are suitable for use in a wide range of applications. It provides a wide range of frequency accuracy and programming options to meet the requirements of a variety of applications. The DS1390U-3+T&R is also backwards compatible with earlier versions of the DS1390.

Overall, the DS1390U-3+T&R is a cost-effective, high-performance real time clock (RTC) designed for applications that require accuracy and reliability. It is ideal for the monitoring and control of systems in a wide range of environments, from consumer electronics to industrial uses. Its features and design make it an ideal choice for any application where a reliable and cost-effective RTC is required.

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