50Mhz to 1hz Clock ic

Since you are asking in this forum I guess you are working with a FPGA or CPLD. Then you don't need any IC; simply instantiate a counter (at least 28bit wide) and reset it when it reaches 50'000'000. The reset signal will pulse at 1Hz frequency.

Anyway, what's your purpose? Creating a 1Hz clock generally doesn't make sense: the common practice is using clocks in the MHz range and driving clock enable pins to get the proper switching rate.