As of right now, this electronic part is in a Obsolete status.A method of mounting it is through Surface Mount.There is a voltage supply of 0 volts for the device.There are some characteristics of Counter, Internal Oscillator that are present in it.
ST16C550IJ44 Features
ST16C550IJ44 Applications
There are a lot of Rochester Electronics, LLC ST16C550IJ44 UARTs applications.