80C51 Microcontrollers

Tekmos has developed an 80C51 core that can be used to replace many variations of the 80C51 microcontroller. Some of the 80C51s that we support are the NXP S87C751/S83C751, the NXP 89C668, and the original Intel 80C32. Our 80C51 can also be used as a core in the customer's system on chip.

The Tekmos 80C51 core has been carefully designed to duplicate the original 80C51 on a clock for clock basis. This guarantees complete compatibility with existing code. Even timing loops will work perfectly.

Below is a list of 80C51 microcontroller variants that are available immediately. Consult the Intel Cross Reference, NXP Cross Reference , or Atmel Cross Reference to locate the equivalent Tekmos device. If you need a version not listed here then please contact us at This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Part Number	Description	Datasheet
TK80C51FA	Microcontroller, 80C51	TK80C51FA
TK89C668	Microcontroller, 80C51, 64K Flash, 8K RAM	TK89C668
TK87C751	Microcontroller, 80C51, 64K Flash	TK87C751
TK83C751	Microcontroller, 80C51, 2K ROM	TK83C751