BUY DM7437N https://www.utsource.net/itm/p/1576563.html

The DM7437N is a 14-pin DIP (dual in-line package) integrated circuit manufactured by National Semiconductor. It is a 4-bit magnitude comparator that compares two 4-bit binary or BCD (Binary Coded Decimal) words and determines whether one is greater than, equal to, or less than the other. Features: * 4-bit magnitude comparison * TTL compatible inputs * Outputs indicate greater than, equal to, or less than * Outputs can be used as inputs for cascading Applications: * Digital thermometers * Digital voltmeters * Digital comparators * Digital clocks * Digital frequency counters (For reference only)