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CS61884 датащи(PDF) 59 Page - Cirrus Logic |
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CS61884 датащи(HTML) 59 Page - Cirrus Logic |
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59 / 72 page ![]() CS61884 DS485PP4 59 19.7 Master Clock Switching Characteristics 19.8 Transmit Switching Characteristics 19.9 Receive Switching Characteristics * All parameters guaranteed by production, characterization or design. Notes: 20. Output load capacitance = 50pF. 21. MCLK is not active. 22. Parameters guaranteed by design and characterization. Parameter Symbol Min. Typ Max Units MASTER CLOCK (MCLK) Master Clock Frequency E1 Modes MCLK 2.048 MHz Master Clock Frequency T1/J1 Modes MCLK 1.544 MHz Master Clock Tolerance - -100 +100 ppm Master Clock Duty Cycle - 40 50 60 % Parameter Symbol Min. Typ Max Units E1 TCLK Frequency 1/tpw2 - 2.048 - MHz E1 TPOS/TNEG Pulse Width (RZ Mode) 236 244 252 nS T1/J1 TCLK Frequency 1/tpw2 - 1.544 - MHz TCLK Tolerance (NRZ Mode) -50 - 50 PPM TCLK Duty Cycle tpwh2/tpw2 -- 90 % TCLK Pulse Width 20 - - nS TCLK Burst Rate Note 22 -- 20 MHz TPOS/TNEG to TCLK Falling Setup Time (NRZ Mode) tsu2 25 - - nS TCLK Falling to TPOS/TNEG Hold time (NRZ Mode) th2 25 - - nS TXOE Asserted Low to TX Driver HIGH-Z - - 1 µS TCLK Held Low to Driver HIGH-Z Note 21 812 20 µS Parameter Symbol Min. Typ Max Units RCLK Duty Cycle 40 50 60 % E1 RCLK Pulse Width 196 244 328 nS E1 RPOS/RNEG Pulse Width (RZ Mode 200 244 300 nS E1 RPOS/RNEG to RCLK rising setup time tsu 150 244 - nS E1 RPOS/RNEG to RCLK hold time th 200 244 - nS T1/J1 RCLK Pulse Width 259 324 388 nS T1/J1 RPOS/RNEG Pulse Width (RZ Mode) 250 324 400 nS T1/J1 POS/RNEG to RCLK rising setup time tsu 150 324 - nS T1/J1 RPOS/RNEG to RCLK hold time th 200 324 - nS RPOS/RNEG Output to RCLK Output (RZ Mode) - - 10 nS Rise/Fall Time, RPOS, RNEG, RCLK, LOS outputs tr,tf - - 85 nS |
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