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XRT7250 数据表(PDF) 41 Page - Exar Corporation |
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XRT7250 数据表(HTML) 41 Page - Exar Corporation |
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41 / 463 page  XRT7250 DS3/E3 FRAMER IC áç áç áç áç REV. 1.1.1 22 t40 "RxPOS" or "RxNEG" set-up time to falling edge of "RxLineClk". (Framer is configured to sample data on "RxPOS" and "RxNEG" input pins, on the falling edge of "RxLi- neClk") 3ns t41 "RxPOS" or "RxNEG" hold time, from falling edge of "RxLineClk" (Framer is configured to sample data on "RxPOS" and "RxNEG" input pins, on the falling edge of "RxLi- neClk") 5ns Receive Payload Data Output Inteface Timing - Serial Mode Operation (See Figure 11) t50 Rising edge of RxClk to "Payload Data" (RxSer) out- put delay 10 13 11 14 12 15 ns DS3 Applications E3 Applications t51 Rising edge of "RxClk" to "RxFrame" output delay 10 13 11 14 12 15 ns DS3 Applications E3 Applications t52 Rising edge of "RxClk" to "RxOHInd" output delay. 10 13 11 14 12 15 ns DS3 Applications E3 Applications Receive Payload Data Output Interface Timing - Nibble Mode Operation (see Figure 12) t53 Falling edge of “RxClk” to rising edge of “RxFrame” output delay 2ns t54 Falling edge of “RxClk” to rising edge of “RxNib[3:0]” output delay 1ns Receive Overhead Data Output Interface Timing - Method 1 - Using RxOHEnable (see Figure 13) t59A Falling edge of “RxOHClk” to “RxFrame” output 20 25 25 28 ns DS3 Applications E3 Applications t59B Falling edge of “RxClk” to “RxOH” output delay 20 25 25 28 ns DS3 Applications E3 Applications Receive Overheadf Data Output Interface Timing - Method 2 - Using RxOHEnable (see Figure 14) t60 Rising edge of "RxOutClk" to rising edge of "RxOHEnable" delay. 27 ns t60A Rising edge of "RxOHFrame" to rising edge of "RxOHEnable" delay 910 220 25 930 240 32 ns ns ns DS3 Applications E3, ITU-T G.832 Applications E3, ITU-T G.751 Applications AC ELECTRICAL CHARACTERISTICS (CONT.) Test Conditions: TA = 25(C, VCC = 5.0V + 5% unless otherwise specified SYMBOL PARAMETER MIN.TYP.MAX.UNITS CONDITIONS |
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