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54AC164245 датащи(PDF) 3 Page - STMicroelectronics |
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54AC164245 датащи(HTML) 3 Page - STMicroelectronics |
3 / 22 page 54AC164245 Functional description Doc ID 18093 Rev 2 3/22 1.1 Cold spare The 54AC164245 features a cold spare input and output buffers. In high reliability applications, cold sparing enables a redundant device to be tied to the data bus with its power supply at 0 V (VDD = VSS, VDD - VSS = 0 V) without affecting the bus signals or injecting current from the I/Os to the power supplies. Cold sparing also allows to keep unpowered redundant devices so that they can be switched on only when required. Power consumption is therefore reduced by switching off the redundant circuit. This has no impact on the application. Cold spare is achieved by implementing a high impedance between I/Os and VDD. The ESD protection is ensured through a non-conventional dedicated structure. 1.2 Power-up During power up, all outputs are forced to high impedance. The high-impedance state is maintained approximately until VDD is high, thus avoiding any transient and erroneous signals during power-up. 1.3 Pin connections Figure 2. Pin connections |
Аналогичный номер детали - 54AC164245 |
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Аналогичное описание - 54AC164245 |
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