M521
Tektronix part number is an M521 trigger chip in an "MQUAD160" package, which is probably more commonly called an MQFP 160. It is used in the TDS520B.
Tektronix part number is an M521 trigger chip in an "MQUAD160" package, which is probably more commonly called an MQFP 160. It is used in the TDS520B.