PDF XRT59L921 Data sheet ( Hoja de datos )

Número de pieza	XRT59L921
Descripción	TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
Fabricantes	Exar Corporation
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No Preview Available ! www.DataSheet4U.com XRT59L921 TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT MARCH 2007 REV. 1.2.1 GENERAL DESCRIPTION The XRT59L921 is an optimized twenty-one channel, E1, line interface unit, fabricated using low power CMOS technology. The device contains twenty-one independent E1 channels. It is primarily targeted towards the SDH multiplexers that accommodate TU12 Tributary Unit Frames. Line cards in these units multiplex 21 E1 channels into higher SDH rates. Devices with 21 E1 interfaces such as the XRT59L921 provide the most efficient method of implementing 63-channel line cards. Each channel performs the driver and receiver functions necessary to convert bipolar signals to logical levels and vice versa. The receiver input accepts transformer coupled 1:1 signals, while the transmitter is coupled to the line using a 1:2 transformer. The same transformer configuration can be used for both balanced and unbalanced interfaces. The device offers Loss of Signal (LOS) detection, that provides an LOS output indication signal with thresholds and delay that comply with the ITU G.775 requirements. FEATURES • Twenty-One (21) Independent E1 (CEPT) Line Interface Units (Transmitter, Receiver, and Recovery) • Transmit Output Pulses that are Compliant with the ITU-T G.703 Pulse Template Requirement for 2.048Mbps (E1) Rates • On-Chip Pulse Shaping for both 75Ω and 120Ω line drivers • Detects and Clears LOS (Loss of Signal) Per ITU-T G.775 • Operates over the Industrial Temperature Range • Ultra Low power consumption • 3.3V operation with 5V Tolerant Input APPLICATIONS • PDH Multiplexers • SDH Multiplexers • Digital Cross-Connect Systems • DECT (Digital European Cordless Telephone) Base Stations • CSU/DSU Equipment FIGURE 1. BLOCK DIAGRAM OF THE XRT59L921 RTIP_0 RRing_0 Receive EquRaelcizeeivr e Equalizer LOS Detector LOS Detector Peak Detector/Slicer Peak Detector/Slicer Channels 2 - 20 Channel 1 Channel 0 LOS_0 Receive Output RIencterivfaecOe utput Interface RxPOS_0 RxNEG_0 TTIP_0 TRing_0 TxON Pulse Shaping Circuit Pulse Shaping Circuit Transmit Input Interface Transmit Input Interface TxPOS_0 TxCLK_0 TxNEG_0 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com 1 page REV. 1.2.1 XRT59L921 TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT PIN DESCRIPTIONS PIN# SYMBOL D8 RxPOS_0 C9 RxPOS_1 D9 RxPOS_2 A10 RxPOS_3 C11 RxPOS_4 A12 RxPOS_5 V10 RxPOS_6 Y9 RxPOS_7 U9 RxPOS_8 V8 RxPOS_9 U7 RxPOS_10 U14 RxPOS_11 Y14 RxPOS_12 V12 RxPOS_13 Y12 RxPOS_14 Y11 RxPOS_15 B13 RxPOS_16 D13 RxPOS_17 C14 RxPOS_18 B14 RxPOS_19 A15 RxPOS_20 E7 C8 E9 B9 C10 B11 V9 W8 T9 U8 T7 T14 W14 V13 W12 W10 C12 E13 D14 C15 A14 RxNEG_0 RxNEG_1 RxNEG_2 RxNEG_3 RxNEG_4 RxNEG_5 RxNEG_6 RxNEG_7 RxNEG_8 RxNEG_9 RxNEG_10 RxNEG_11 RxNEG_12 RxNEG_13 RxNEG_14 RxNEG_15 RxNEG_16 RxNEG_17 RxNEG_18 RxNEG_19 RxNEG_20 TYPE O DESCRIPTION Receiver Positive Data Out – Channel_n: (n=0 to 20) This output pin will pulse “High” whenever Channel_n, within the XRT59L921 has received a Positive Polarity pulse, in the incoming line signal, at RTIP_n/RRing_n inputs. O Receiver Negative Data Out – Channel_n: This output pin will pulse “High” whenever Channel_n, within the XRT59L921 has received a Negative Polarity pulse, in the incoming line signal, at RTIP_n/RRing_n inputs. 3 5 Page REV. 1.2.1 PIN DESCRIPTIONS PIN# D10 D12 U10 U12 L17 SYMBOL AVDD AVDD AVDD AVDD AVDD A1 A20 Y1 Y2 Y20 U11 W20 C20 D11 DVDD DVDD DVDD DVDD DVDD DVDD F1 DGND F20 DGND J1 DGND J20 DGND M1 DGND M20 DGND R1 R20 W1 T11 V1 V20 C19 E11 B2 XRT59L921 TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT TYPE - DESCRIPTION Positive Supply - (+3.3V ± 5%). Receivers - Positive Supply (+3.3V ± 5%). Digital Circuitry. - Digital Ground: Digital Circuitry. 9 11 Page

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