DS1647, DS1647P Nonvolatile Timekeeping RAM

The DS1647 is a 512k x 8 nonvolatile static RAM with a full-function Real-Time Clock which are both accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent to any JEDEC standard 512k x 8 SRAM The device CAN also be easily substituted for ROM, EPROM and EEPROM 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 DS1647 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.
By Maxim Integrated Products
DS1647 's PackagesDS1647 's pdf datasheet
DS1647-120
DS1647P-120
DS1647P




DS1647 Pinout, Pinouts
DS1647 pinout,Pin out
This is one package pinout of DS1647,If you need more pinouts please download DS1647's pdf datasheet.

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