ST72F321 Datasheet, PDF (155/189 Pages) STMicroelectronics – 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE

ST72321
EMC CHARACTERISTICS (Cont’d)
12.7.3 Absolute Maximum Ratings (Electrical
Sensitivity)
Based on three different tests (ESD, LU and DLU)
using specific measurement methods, the product
is stressed in order to determine its performance in
terms of electrical sensitivity. For more details, re-
fer to the application note AN1181.
12.7.3.1 Electro-Static Discharge (ESD)
Electro-Static Discharges (a positive then a nega-
tive 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 pin). Two models can be simulated: Human
Body Model and Machine Model. This test con-
forms to the JESD22-A114A/A115A standard.
Absolute Maximum Ratings
Symbol
V_ESD(HBM)
V_ESD(MM)
Ratings
Electro-static discharge voltage
(Human Body Model)
Electro-static discharge voltage
(Machine Model)
Conditions
T_A=+25°C
T_A=+25°C
Maximum value ¹⁾ Unit
2000
V
200
Notes:
1. Data based on characterization results, not tested in production.
12.7.3.2 Static and Dynamic Latch-Up
■ LU: 3 complementary static tests are required
on 10 parts to assess the latch-up performance.
A supply overvoltage (applied to each power
supply pin) and a current injection (applied to
each input, output and configurable I/O pin) are
performed on each sample. This test conforms
to the EIA/JESD 78 IC latch-up standard. For
more details, refer to the application note
AN1181.
■ DLU: Electro-Static Discharges (one positive
then one negative test) are applied to each pin
of 3 samples when the micro is running to
assess the latch-up performance in dynamic
mode. Power supplies are set to the typical
values, the oscillator is connected as near as
possible to the pins of the micro and the
component is put in reset mode. This test
conforms to the IEC1000-4-2 and SAEJ1752/3
standards. For more details, refer to the
application note AN1181.
Electrical Sensitivities
Symbol
Parameter
LU
Static latch-up class
DLU
Dynamic latch-up class
Conditions
T_A=+25°C
T_A=+85°C
T_A=+125°C
V_DD=5.5V, f_OSC=4MHz, T_A=+25°C
Class ¹⁾
A
A
A
A
Notes:
1. Class description: A Class is an STMicroelectronics internal specification. All its limits are higher than the JEDEC spec-
ifications, that means when a device belongs to Class A it exceeds the JEDEC standard. B Class strictly covers all the
JEDEC criteria (international standard).
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