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SELECTING BETWEEN ROM, FASTROM AND OTP FOR A MICROCONTROLLER

2 COMPARISON OF PRODUCTION FLOWS FOR ROM AND OTP

ROM and OTP devices have exactly the same functional and electrical behaviour in an appli-

cation because STMicroelectronics designs the two products with the same methodology. ROM

and OTP devices are qualified using the same procedures. They are tested using the same test

flows (see further) and with the same parameter limits. A good indication of device similarity

is EMC (electromagnetic noise immunity) measurements performed on both versions (ROM

and OTP) for the same MCU device.

ST6220 (ROM version)

ST62T20 (OTP version)