DS1742W-120+

The DS1742W-120+ is an Y2KC (year 2000 compliant) non-volatile timekeeping RAM in 24 pin EDIP package. It includes integrated 2K x 8 non-volatile static RAM, real time clock (RTC), crystal, power fail control circuit and lithium energy source. The lithium energy source is electrically disconnected to retain freshness until power is applied for first time. The RTC registers contain century, year, month, date, day, hours, minutes and seconds data with automatic leap year compensation valid up to year 2100 in 24 hour BCD format. Corrections for day of 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 timekeeping countdown continues unabated by access to time register data. It has standard JEDEC bytewide 2K x 8 static RAM pin-out.