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DS1644 Features- Integrated NV SRAM, real-time clock, crystal, power-fail control circuit and lithium energy source
- Clock registers are accessed identically to the static RAM. These registers are resident in the eight top RAM locations.
- Totally nonvolatile with over 10 years of operation in the absence of power
- BCD coded year, month, date, day, hours, minutes, and seconds with leap year compensation valid up to 2100
- Power-fail write protection allows for ±10% VCCpower supply tolerance
- DS1644 only (DIP Module)
? Upward compatible with the DS1643 Timekeeping RAM to achieve higher RAM density ? Standard JEDEC bytewide 32k x 8 static RAM pinout - DS1644P only (PowerCap® Module Board)
? Surface mountable package for direct connection to PowerCap containing battery and crystal
? Replaceable battery (PowerCap)
? Power-fail output
? Pin-for-pin compatible with other densities of DS164XP Timekeeping RAM
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