DS2145/0S2146 FULL DATA SHEET AVAILABLE -- CALL 214-450-3836 DALLAS SEMICONDUCTOR DS2145/DS2146 T1/CEPT Medium Haul PCM Line Interface FEATURES T1 (1.544 Mbps) and CEPT (2.048 Mbps) PCM line in- terface transceiver Pin compatible with the CS61574(A)/75/35(A) and LXT300/304A/305(A) Receiver sensitivity of -18 dB will recover data off of lines up to 3300 feet (1 km) in length Onboard 128 bit jitter attenuator which can be dis- abled * 082145 contains a receive side jitter attenuator DS2146 contains a transmit side jitter attenuator * Compatible with Dallas Semiconductor's complete line of framers including the DS2180A, DS2181A, and DS2141 @ Available in 28 pin DIP and PLCC Single +5V supply DESCRIPTION The DS2145 and DS2146 are monolithic CMOS T1 (1.544 Mbps) and CEPT (2.048 Mbps) line interface transceivers. They couple directly to the T1 or CEPT lines via a transformer and will recover both clock and data from lines as long as 3300 feet (1 km). These de- vices contain a digital clock recovery system which is very tolerant to incoming jitter and its on-board 128 bit jitter attenuator allows it to smooth wide excursions that can appear inT1 and CEPT data streams. The DS2145 PIN ASSIGNMENT ACLKI Oy TAS TCLK fo SCLK tpos Es cs TNEG O4 SDO sps Js sD! RNEG [6 iNT RPos []7 RVSS reik Os RVOD xratt UJ RRING XTAL2 {J RTIP opm U MRING rev MTIP tp C TRING Tvss Typo and DS2146 contain a receive only monitor mode in which the transmitter canbe disabled to lower the power consumption and the receive side reconstruction filter can also be disabled and replaced with straight resistive gains of 12 dB, 18 dB, or 24.dB. These devices met or exceed the applicable sections of AT&T TR62411 (Dec. 90), ANSI T1.403-1989, and the CCITT Blue book Rec- ommendations G.703, G.823, and G.735. 020592 1/1 14-4