The DS1511W from Analog Devices Inc./Maxim Integrated is a real-time clock (RTC) Integrated Circuit with clock/calendar functions and 256B parallel memory, in a 28-DIP module (0.600", 15.24 mm) package.
The DS1511Y from Analog Devices Inc./Maxim Integrated is a real-time clock Integrated Circuit with clock/calendar function and 256B parallel memory, in a 28-DIP module (0.600", 15.24 mm).