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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72324 датащи(PDF) 133 Page - STMicroelectronics |
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ST72324 датащи(HTML) 133 Page - STMicroelectronics |
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133 / 161 page  ST72324 133/161 EMC CHARACTERISTICS (Cont’d) 12.7.4 ESD Pin Protection Strategy To protect an integrated circuit against Electro- Static Discharge the stress must be controlled to prevent degradation or destruction of the circuit el- ements. The stress generally affects the circuit el- ements which are connected to the pads but can also affect the internal devices when the supply pads receive the stress. The elements to be pro- tected must not receive excessive current, voltage or heating within their structure. An ESD network combines the different input and output ESD protections. This network works, by al- lowing safe discharge paths for the pins subjected to ESD stress. Two critical ESD stress cases are presented in Figure 72 and Figure 73 for standard pins and in Figure 74 and Figure 75 for true open drain pins. Standard Pin Protection To protect the output structure the following ele- ments are added: – A diode to VDD (3a) and a diode from VSS (3b) – A protection device between VDD and VSS (4) To protect the input structure the following ele- ments are added: – A resistor in series with the pad (1) – A diode to VDD (2a) and a diode from VSS (2b) – A protection device between VDD and VSS (4) Figure 72. Positive Stress on a Standard Pad vs. VSS Figure 73. Negative Stress on a Standard Pad vs. VDD IN VDD VSS (1) (2a) (2b) (4) OUT VDD VSS (3a) (3b) Main path Path to avoid IN VDD VSS (1) (2a) (2b) (4) OUT VDD VSS (3a) (3b) Main path |
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