Datasheet

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STM32F334x4 STM32F334x6 STM32F334x8 Electrical characteristics
101
6.3.12 Electrical sensitivity characteristics
Based on three different tests (ESD, LU) using specific measurement methods, the device is
stressed to determine its performance in terms of electrical sensitivity.
Electrostatic discharge (ESD)
Electrostatic discharges (a positive then a negative pulse separated by 1 second) are
applied to the pins of each sample according to each pin combination. The sample size
depends on the number of supply pins in the device (3 parts × (n+1) supply pins). This test
conforms to the JESD22-A114/C101 standard.
Static latch-up
Two complementary static tests are required on six parts to assess the latch-up
performance:
• A supply overvoltage is applied to each power supply pin
• A current injection is applied to each input, output and configurable I/O pin
These tests are compliant with EIA/JESD 78A IC latch-up standard.
6.3.13 I/O current injection characteristics
As a general rule, current injection to the I/O pins, due to external voltage below V
SS
or
above V
DD
(for standard, 3 V-capable I/O pins) must be avoided during normal product
operation. However, to give an indication of the robustness of the microcontroller in cases
when abnormal injection accidentally happens, susceptibility tests are performed on a
sample basis during device characterization.
Functional susceptibility to I/O current injection
While a simple application is executed on the device, the device is stressed by injecting
current into the I/O pins programmed in floating input mode. While current is injected into
the I/O pin, one at a time, the device is checked for functional failures.
Table 47. ESD absolute maximum ratings
Symbol Ratings Conditions Class
Maximum
value
(1)
1. Data based on characterization results, not tested in production.
Unit
V
ESD(HBM
)
Electrostatic discharge
voltage (human body model)
T
A
= +25 °C,
conforming to JESD22-
A114
22000
V
V
ESD(CD
M)
Electrostatic discharge
voltage (charge device
model)
T
A
= +25 °C,
conforming to JESD22-
C101
II 250
Table 48. Electrical sensitivities
Symbol Parameter Conditions Class
LU Static latch-up class T
A
= +105 °C conforming to JESD78A II level A
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