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ST72121 series datasheets. Manufacturer: SGS-Thomson Microelectronics.

ST721218-BIT MICROCONTROLLER (MCU) WITH 8 TO 16 K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI & 2 TIMERS - SDIP42, TQFP44Datasheet*)
ST72121J28-BIT MICROCONTROLLER (MCU) WITH 8 TO 16 K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI & 2 TIMERS - SDIP42, TQFP44Datasheet*)
ST72121J48-BIT MICROCONTROLLER (MCU) WITH 8 TO 16 K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI & 2 TIMERS - SDIP42, TQFP44Datasheet*)
ST72T121J28-BIT MICROCONTROLLER (MCU) WITH 8 TO 16 K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI & 2 TIMERS - SDIP42, TQFP44Datasheet*)
ST72T121J48-BIT MICROCONTROLLER (MCU) WITH 8 TO 16 K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI & 2 TIMERS - SDIP42, TQFP44Datasheet*)
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