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ST92F120V1Q7 Fiches technique(PDF) 8 Page - STMicroelectronics

No de pièce ST92F120V1Q7
Description  8/16-BIT FLASH MCU FAMILY WITH RAM, EEPROM AND J1850 BLPD
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92F120V1Q7 Fiches technique(HTML) 8 Page - STMicroelectronics

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ST92F120 - GENERAL DESCRIPTION
voltage drop across the SCR parasitic resistor, the
SCR may be turned on; to turn off the SCR it is
necessary to remove the power supply from the
device.
The present ST9 design implements layout and
process solutions to decrease the effects of elec-
trostatic discharges (ESD) and latchup. Of course
it is not possible to test all devices, due to the de-
structive nature of the mechanism; in order to
guarantee product reliability, destructive tests are
carried out on groups of devices, according to
STMicroelectronics internal Quality Assurance
standards and recommendations.
1.2.4.2 Protective Interface
Although ST9 input/output circuitry has been de-
signed taking ESD and Latchup problems into ac-
count, for those applications and systems where
ST9 pins are exposed to illegal voltages and high
current injections, the user is strongly recommend-
ed to implement hardware solutions which reduce
the risk of damage to the microcontroller: low-pass
filters and clamp diodes are usually sufficient in
preventing stress conditions.
The risk of having out-of-range voltages and cur-
rents is greater for those signals coming from out-
side the system, where noise effect or uncon-
trolled spikes could occur with higher probability
than for the internal signals; it must be underlined
that in some cases, adoption of filters or other ded-
icated interface circuitries might affect global mi-
crocontroller performance, inducing undesired tim-
ing delays, and impacting the global system
speed.
Figure 3. Digital Input/Output - Push-Pull
PIN
OUTPUT
BUFFER
P
N
P
N
N
INPUT
BUFFER
P
ESD PROTECTION
CIRCUITRY
PORT CIRCUITRY
I/O CIRCUITRY
P
EN
EN
1


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