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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN7500 датащи(PDF) 49 Page - Microchip Technology |
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LAN7500 датащи(HTML) 49 Page - Microchip Technology |
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49 / 58 page  Hi-Speed USB 2.0 to 10/100/1000 Ethernet Controller Datasheet 2014 Microchip Technology Inc. DS00001734A-page 49 7.5.3 Power-On Reset Timing Figure 7.3 illustrates the nRESET timing requirements in relation to power-on. A hardware reset (nRESET assertion) is required following power-on. For proper operation, nRESET must be asserted for no less than trstia. The nRESET pin can be asserted at any time, but must not be deasserted before tpurstd after all external power supplies have reached operational levels. Note: nRESET deassertion must be monotonic. Figure 7.3 nRESET Power-On Timing Table 7.16 nRESET Power-On Timing Values SYMBOL DESCRIPTION MIN TYP MAX UNITS tpurstd External power supplies at operational level to nRESET deassertion 25 mS tpurstv External power supplies at at operational level to nRESET valid 0nS trstia nRESET input assertion time 100 S |
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