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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LXT970ATC датащи(PDF) 59 Page - Intel Corporation |
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LXT970ATC датащи(HTML) 59 Page - Intel Corporation |
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59 / 74 page  Dual-Speed Fast Ethernet Transceiver — LXT970A Datasheet 59 Figure 30. 10BASE-T SQE (Heartbeat) Timing Table 39. 10BASE-T SQE (Heartbeat) Timing Parameters Parameter Sym Min Typ 1 Max Units Test Conditions COL (SQE) Delay after TX_EN off t9A 0.65 1.0 1.6 µs COL (SQE) Pulse duration t9B .5 1.0 1.5 µs 1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing. Figure 31. 10BASE-T Jab and Unjab Timing Table 40. 10BASE-T Jab and Unjab Timing Parameters Parameter Sym Min Typ 1 Max Units Test Conditions Maximum Transmit time t10A 20 96 - 128 2 150 ms Unjab time t10B 250 525 750 ms 1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing. 2. Typical transmit time may be either of these values depending on internal 32 ms clock synchronization. TX_CLK TX_EN t9A t9B COL TXD COL t10A t10B TX_EN |
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