Dallas microcontrollers

[Malik]

Does anyone know why the Dallas MCU DS80C400 is no longer in production while the less powerful DS80C320 is still in production?

[epson]

no idea, the fact is that from time to time chip manufacturers discover that some circuits are “obsolete” and stop production. A few weeks ago I was looking for a dual 4-bit latch with tri-state output. It exists as 74ALS873, manufactured by Texas Instruments. This is a very useful circuit. Now also discontinued.