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ST3237EBDR Folha de dados(PDF) 10 Page - STMicroelectronics

Nome de Peças ST3237EBDR
Descrição Electrónicos  짹 15 kV ESD protected, 1 關A, 3 to 5.5 V, 250 kbps RS-232 transceiver with stand-by
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST3237EBDR Folha de dados(HTML) 10 Page - STMicroelectronics

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Application note
ST3237EB
10/18
6
Application note
This application note describes the procedure for determining the susceptibility and the test
method to verify ST ESD advanced protection on RS-232 or RS485 I/O device.
Static electricity is defined as an electrical charge caused by an imbalance of electrons on
the surface of a material. This imbalance of electrons produces an electric field that can be
measured and that can influence other objects at a distance. Electrostatic discharge is
defined as the transfer of charge between bodies at different electrical potentials.
Electrostatic discharge (ESD) can change the electrical characteristics of a semiconductor
device, degrading or destroying it. Any input or output port (I/O) allows access
communication with other pieces of equipment by external connectors. These connectors
are directly linked by the I/O pins of RS-232 or RS485 interface. ST provides the E-series by
advanced high ESD protection structure. The protection functionality is tested in two
different conditions:
The first model is used to simulate the HUMAN BODY MODEL (HBM) event. A similar
discharge can occur from a charged conductive object, such as a metallic tool or fixture. The
model used to characterize this event is known as the machine model. A human body model
circuit and waveform is presented in figures below.
Figure 7.
Human body model circuit
Figure 8.
Human body model current waveform


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