mindspeed technologies ? 1 mindspeed proprietary and confidential bt8370/bt8375/bt8376 product bulletin: upgrading bt837x designs product affected: bt8 370/bt8375/bt8376 this document describes the chan ges that are required to upgrade an existing design based on bt8370-20, bt8370-21, bt8375-16, bt8375-17, bt8376-16 or bt8376-17 to bt8370-22, bt8370-23, bt8375-23 or bt8376-23 devices. ? did (device id; addr 000) for the new revisions is different. please see the table below for new values: if your application software ch ecks for the did, please modify the software as per the new values given in the table above. ? the device-side secondary protection on the tx lines is no longer required for bt8370-22, bt8370-23, bt8375-23, or bt8376-23 devices. ? earlier versions of the bt8370, bt8375 and bt8376 devices required device-side secondary protection devices for improved latchup immuni ty as illustrated in figures 4-1 and 4-4 of the bt8370/75/76 data sheet (doc# n8370dse). ? in the newer bt8370/bt8375/bt8376 parts (bt8 370/22 or bt8370-23, bt8375-23, bt8376- 23), the reset path going from ier4 to ier7 is no longer blocked. ier4 to ier7 are properly reset by a software or hardware reset, however the por procedure as described in section 2.10.4 of the bt8370 data sheet (document # 500030b) is still necessary since the loop register needs to be manually reset. please contact your local mindspeed technologies sales office for placing orders for the newer devices. device did bt8370-22 9 bt8370-23 9 bt8375-23 9 bt8376-23 9 note: the bt8370-22, bt8370-23, bt8375 -23, or bt8376-23 devices work fine even if the device-side secondar y protection on the tx lines is still present. 28370-pbd-005-a february 10, 2003
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