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LXT332 Datasheet(PDF) 9 Page - Level One |
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LXT332 Datasheet(HTML) 9 Page - Level One |
9 / 32 page L1 ëðììè /;7êêë 'XDO 7ìî(ì /LQH ,QWHUIDFH 8QLW ZLWK &U\VWDOðOHVV -LWWHU $WWHQXDWLRQ ìæ RCLK0 DO Receive Clock - Port 0. This clock is recovered from the input signal. Under Loss of Signal (LOS) conditions, this output is derived from MCLK. ëå TAOS0 DI Transmit All Ones Enable - Port 0. When TAOS is High and RLOOP is Low, the TPOS/TNEG or TDATA input is ignored and port 0 transmits a stream of ones at the TCLK frequency. If TCLK is not provided, the MCLK input is used as the transmit reference. ê é è ä ìí ìì LEN20 LEN10 LEN00 DI DI DI Line Length Equalizer Inputs - Port 0. This pins determine the shape and amplitude of the transmit pulse. çìë MCLK DI Master Clock. The master clock (1.544 MHz for T1, 2.048 MHz for E1) input must be independent, free-running, continuously active and jitter free for receiver operation. Since the transceivers derive their RCLK timing from the MCLK input on Loss of Signal (LOS), MCLK cannot be derived from RCLK. æìê GND – Ground. Ground return for power supply VCC. å ìì ìé ìæ TTIP0 TRING0 AO AO Transmit Tip and Ring - Port 0. The tip and ring pins for each port are dif- ferential driver outputs designed to drive a 35 - 200 Ω load. Line matching resistors and transformers can be selected to give the desired pulse height. See Figures 13 through 15. äìè TGND0 – Ground. Ground return for power supply TVCC0. ìí ìç TVCC0 AI + 5 volt power supply input for the port 0 transmit driver. TVCC0 must not vary from TVCC1 or VCC by more than ± 0.3 V. ìë ìå DFM DO Driver Fail Monitor. This signal goes High to indicate a driver output short in one or both ports. ìê ìä RLOOP0 DI Remote Loopback Enable - Port 0. When RLOOP = 1, the port 0 clock and data inputs from the framer are ignored and the data received from the twisted- pair line is transmitted back onto the line at the RCLK frequency. (LLOOP0 must be Low for RLOOP0 to occur.) ìé ëí LOS0 DO Loss of Signal - Port 0. LOS goes High when 175 consecutive spaces have been detected. LOS returns Low when the received signal reaches a mark den- sity of 12.5% (determined by receipt of four marks with a sliding 32-bit period with no more than 15 consecutive zeros). Received marks are output on RPOS/RNEG or RDATA even when LOS is High. ìè ìç ëì ëë RTIP0 RRING0 AI AI Receive Tip and Ring - Port 0. RTIP and RRING comprise the receive line interface. This input pair should be connected to the line through a center- tapped 1:2 transformer. ìæ ëê LLOOP0 DI Local Loopback Enable - Port 0. When LLOOP is High, the RTIP/RRING inputs from the port 0 line are disconnected and the transmit data inputs are routed back into the receive inputs (through JA if enabled). (RLOOP0 must be Low for LLOOP0 to occur.) ìå ìä ëé ëè RRING1 RTIP1 AI AI Receive Tip and Ring - Port 1. RTIP and RRING comprise the receive line interface. This input pair should be connected to the line through a center- tapped 1:2 transformer. 7DEOH êã +DUGZDUH 0RGH 3LQ DQG %LSRODU +DUGZDUH 0RGH 3LQ 'HVFULSWLRQVì ¤ FRQWLQXHG 3LQ 4)3 3LQ 3/&& 6\PERO ,î2ë 'HVFULSWLRQ ì 7DEOH é GHVFULEHV WKH SLQV XVHG LQ 8QLSRODU +DUGZDUH 0RGHï ëï ', 'LJLWDO ,QSXWâ '2 'LJLWDO 2XWSXWâ ',î2 'LJLWDO ,QSXWî2XWSXWâ $, $QDORJ ,QSXWâ $2 $QDORJ 2XWSXW |
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