The DS1670S+ from Analog Devices Inc./Maxim Integrated is a real-time clock Integrated Circuit with portable system controller function and 3-wire serial interface, in a 20-SOIC package (0.295", 7.50 mm width).
The DS1670E+T&R from Analog Devices Inc./Maxim Integrated is a real-time clock (RTC) Integrated Circuit and portable system controller with a 3-wire serial interface, in a 20-TSSOP (0.173", 4.40 mm width) package.
The DS1670E+ from Analog Devices Inc./Maxim Integrated is a portable system controller real-time clock Integrated Circuit with a 3-wire serial interface, in a 20-TSSOP package with 0.173" (4.40 mm) width.