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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83848JSQ датащи(PDF) 63 Page - Texas Instruments |
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DP83848JSQ датащи(HTML) 63 Page - Texas Instruments |
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63 / 80 page  www.national.com 62 8.2.2 Reset Timing Note: It is important to choose pull-up and/or pull-down resistors for each of the hardware configuration pins that provide fast RC time constants in order to latch-in the proper value prior to the pin transitioning to an output driver. Vcc Hardware RESET_N MDC 32 clocks Latch-In of Hardware Configuration Pins Dual Function Pins Become Enabled As Outputs input output T2.2.3 T2.2.2 T2.2.1 X1 clock T2.2.4 Parameter Description Notes Min Typ Max Units T2.2.1 Post RESET Stabilization time prior to MDC preamble for reg- ister accesses MDIO is pulled high for 32-bit serial man- agement initialization 3 µs T2.2.2 Hardware Configuration Latch- in Time from the Deassertion of RESET (either soft or hard) Hardware Configuration Pins are de- scribed in the Pin Description section 3 µs T2.2.3 Hardware Configuration pins transition to output drivers 50 ns T2.2.4 RESET pulse width X1 Clock must be stable for at min. of 1us during RESET pulse low time. 1 µs |
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