In the 40-DIP (0.600, 15.24mm) package, you can get the product at a low cost.Transmission is done through 2, DUART channels.As for packaging, Tube is chosen.This electronic part is Obsolete at present.Through Through Hole, it can be mounted.5V supply voltage is required to operate it.There are some characteristics of Internal Oscillator, Timer/Counter that are present in it.
XR88C681P/40 Features
XR88C681P/40 Applications
There are a lot of MaxLinear, Inc. XR88C681P/40 UARTs applications.