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STM32F745XX Datasheet, PDF (135/227 Pages) STMicroelectronics – ARM-based Cortex-M7 32b MCU+FPU, 462DMIPS, up to 1MB Flash/320+16+ 4KB RAM, USB OTG HS/FS, ethernet, 18 TIMs, 3 ADCs, 25 com itf, cam & LCD
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STM32F745xx STM32F746xx
Electrical characteristics
5.3.14
Table 50. Flash memory endurance and data retention
Symbol Parameter
Conditions
Value
Min(1)
NEND Endurance
TA = –40 to +85 °C (6 suffix versions)
TA = –40 to +105 °C (7 suffix versions)
10
1 kcycle(2) at TA = 85 °C
30
tRET Data retention 1 kcycle(2) at TA = 105 °C
10
10 kcycles(2) at TA = 55 °C
20
1. Guaranteed by characterization results.
2. Cycling performed over the whole temperature range.
Unit
kcycles
Years
EMC characteristics
Susceptibility tests are performed on a sample basis during device characterization.
Functional EMS (electromagnetic susceptibility)
While a simple application is executed on the device (toggling 2 LEDs through I/O ports).
the device is stressed by two electromagnetic events until a failure occurs. The failure is
indicated by the LEDs:
• Electrostatic discharge (ESD) (positive and negative) is applied to all device pins until
a functional disturbance occurs. This test is compliant with the IEC 61000-4-2 standard.
• FTB: A burst of fast transient voltage (positive and negative) is applied to VDD and VSS
through a 100 pF capacitor, until a functional disturbance occurs. This test is compliant
with the IEC 61000-4-4 standard.
A device reset allows normal operations to be resumed.
The test results are given in Table 51. They are based on the EMS levels and classes
defined in application note AN1709.
Table 51. EMS characteristics
Symbol
Parameter
Conditions
Level/
Class
VFESD
Voltage limits to be applied on any I/O pin to
induce a functional disturbance
VDD = 3.3 V, LQFP176, TA =
+25 °C, fHCLK = 216 MHz, conforms
to IEC 61000-4-2
2B
Fast transient voltage burst limits to be
VDD = 3.3 V, TFBGA216, TA
VEFTB applied through 100 pF on VDD and VSS
=+25 °C, fHCLK = 216 MHz,
4A
pins to induce a functional disturbance
conforms to IEC 61000-4-2
As a consequence, it is recommended to add a serial resistor (1 kΏ) located as close as
possible to the MCU to the pins exposed to noise (connected to tracks longer than 50 mm
on PCB).
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