STM32F051K4U6 Datasheet, PDF (74/104 Pages) STMicroelectronics – Low- and medium-density advanced ARM™-based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces

STM32F051x
Electrical characteristics
Figure 20. I/O AC characteristics definition
90%
50%
10%
10%
50%
90%
EXT ERNAL
O UTP UT
ON 50pF
tr(I _O)out
tr(I _O)out
T
Maximum fr equency is achieved if (tr + tf) ≤ 2/3) T and if the duty cycle is (45-55%)
when loaded by 50pF
ai14131
Doc ID 022265 Rev 3
75/105