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UT699CPC 数据表(PDF) 31 Page - Aeroflex Circuit Technology |
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UT699CPC 数据表(HTML) 31 Page - Aeroflex Circuit Technology |
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31 / 41 page  31 4.7 Timing Characteristics for Ethernet Interface (VDD = 3.3V + 0.3V; VDDC = 2.5V + 0.2V; TC = -40 oC to 105oC) Notes: 1. All outputs are measured using the load conditions shown in Figure 15. 2. ERX_COL and ERX_CRS are asynchronous inputs and are not tested. 3. fEMDC = fSYSCLK / 202. 4. Guaranteed by design. Figure 13. Ethernet Transmit and Receive Timing Symbol Description Conditions Min Max Units t251 ETX_CLK to output valid (ETXD[3:0], and ETX_EN) 28 ns t262 Setup time to ERX_CLK (ERX_DV4ERX_ER, and ERXD[3:0]) 1-- ns t272 Hold time from ERX_CLK (ERX_DV4ERX_ER, and ERXD[3:0]) 1-- ns t281 EMDCto output valid (EMDIO) fEMDC= 123KHz 3; f SYSCLK = 25MHz 211 ns t294 Setup time to EMDC(EMDIO) 10 -- ns t304 Hold time from EMDC(EMDIO) 5 -- ns t27 t26 t25 ETX_CLK All Outputs ERX_CLK All Inputs |
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