Is the LXT970A a drop-in replacement for the LXT970 device?
The LXT970A is the B9 to B11 stepping revision of the LXT970, and is pin for pin compatible. Although, the LXT970A has fixed many of the existing known errata for previous stepping revisions of the LXT970, and it is therefore recommended that you acquire the LXT970A Fast Ethernet Transceiver Revision B11 Stepping document for known design considerations.