MAXIM INTEGRATED / ANALOG DEVICES DS1744W-120+ Datasheet & Stock

The DS1744W-120+ is a Y2K compliant, non-volatile timekeeping RAMs in 28 pin EDIP package. This device is a full-function real time clock/calendar (RTC) and 32k x 8 NV SRAM. User access to all registers within the part is accomplished with a byte wide interface. The RTC information and control bits reside in the eight uppermost RAM locations. The RTC registers contain century, year, month, date, day, hours, minutes and seconds data in 24 hour binary coded decimal (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 and prevents time loss as the timekeeping countdown continues unabated by access to time register data. This device contains its own power fail circuitry which deselects device when the VCC supply is in out of tolerance condition.




Supply voltage range from 2.97V to 3.63V

Operating temperature range from 0°C to 70°C

Integrated NV SRAM, real time clock, crystal, power fail control circuit and lithium energy source

Clock registers are accessed identically to the SRAM, access time is 120ns

Totally non-volatile with over 10 years of operation in absence of power

Battery voltage level indicator flag

Power fail write protection allows for ±10% VCC power supply tolerance

Power fail write protection allows for ±10% VCC power supply tolerance

UL recognized





Applications


Clock & Timing





Warnings
Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.