TDK Semiconductor has introduced an expanded line of multiport interface transceiver ICs for E3, DS3 and STS-1 applications that operate at 3,3 V. The 78P2242 (dual port), 78P2243 (triple port) and 78P2244 (quad port) are extensions of TDK's 78P2241 single chip IC. Each channel features a clock recovery and transmitter pulse shaping function for applications using 75 Ohm coaxial cable at distances up to 335 m. A new feature is the input receiver MUX, which saves board space and component cost by replacing external switches. The receivers from each device recover clock and data from a B3ZS or HDB3-coded AMI signal. The clock/data recovery circuit can compensate for over 12 dB of cable and 6 dB of flat loss. The transmitters in each device generate signals that meet the standard pulse shape requirements and a line build-out (LBO) function controls the amplitude and pulse shape in DS3 mode. The 78P2242 is available in 80-lead TQFP package. 78P2243/4 come in 128-lead TQFP.
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