DS1642 - 非易失时钟RAM

DS1642是Maxim美信半导体公司的一款1-Wire器件产品，DS1642是非易失时钟RAM，本站介绍了DS1642的封装应用图解、特点和优点、功能等，并给出了与DS1642相关的Maxim元器件型号供参考。

DS1642 - 非易失时钟RAM - 1-Wire器件 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The DS1642 is a 2k x 8 nonvolatile static RAM and a full-function real-time clock (RTC), both of which are accessible in a bytewide format. The nonvolatile time keeping RAM is pin and function equivalent to any JEDEC-standard 2k x 8 SRAM. The device can also be easily substituted in ROM, EPROM, and EEPROM sockets, providing read/write nonvolatility and the addition of the real-time clock function. The real-time clock information resides in the eight uppermost RAM locations. The RTC registers contain 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 registers are double-buffered to avoid access of incorrect data that can occur during clock update cycles. The double-buffered system also prevents time loss as the timekeeping countdown continues unabated by access to time register data. The DS1642 also contains its own power-fail circuitry, which deselects the device when the VCC supply is in an out-of-tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided.

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