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L3000S Datasheet(PDF) 15 Page - STMicroelectronics |
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L3000S Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 29 page  DIGITAL INTERFACE ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Conditions Min. Typ. Max. Unit DYNAMIC ELECTRICAL CHARACTERISTICS fclk Clock Frequency 1 600 kHz Tr, Tf Clock Rise and Fall Time 50 ns Twh, Twl Clock Impulse Width 750 ns Tis CI to NCS Set up Time 300 ns Tec ”0” EIA to DCKL Set up Time 300 ns Tsc DCKL to NCS Delay (+ edge) 300 ns Tsd Data in Set up Time 0 ns Thd Data in Hold Time 800 ns Tcs NCS to DCKL Hold Time 800 ns Tca ”0” EIA to DCKL Hold Time 900 ns Tac ”1” EIA to DCKL Set up Time 400 ns Tzd Data out to ”0” NCS Delay 0 600 ns Tce ”1” EIA to DCKL Hold Time 900 ns Tdz Data out to ”1” NCS Delay 500 ns Tdd Data out to DCKL Delay 1500 ns Tsi ”0” CI to NCS Hold Time 300 ns OPERATION DESCRIPTION To set SLIC in operation the following parameters have to be defined : - the DC feedingresistance RFS, definedas the re- sistance of each side of the traditional feeding sy- stem (most common values are 200, 400 or 500 ohm). - the AC impedanceat line terminals, ZML, to which the return loss measurement references.It can be real (typically 600 ohm) or complex. - the equivalent AC impedance of the line Zline, when evaluating the trans hybrid loss (2/4 wire conversion). It is usually a complex impedance. - the ringing signal frequency Fr (ST SLIC allows frequency ranging from 16 to 66Hz). - the metering pulse frequency Ft (two values are possible : 12kHz or 16kHz). - the value of the two resistors RP1/RP2 in series with the line terminals ; main purpose of the a.m. resistors is to allow primary protection to fire. ST suggest the minimum value of 50 ohm for each side. On this assumptions,the following componentlist is defined. L3000S - L3030 15/29 |
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