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61581pi.fm Page -1 Wednesday, January 21, 1998 9:48 AM
CS61581
T1/E1 Universal Line Interface
The following information is based on the technical datasheet:
CS61581 DS211PP3 NOV '97 Please contact Cirrus Logic : Communications Products Division for further information.
&20081,&$7,216 352'8&7 ',9,6,21 352'8&7 ,1)250$7,21
Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
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CS61581
Features
T1/E1 Universal Line Interface
Features
q Provides T1 and E1, Long Haul and Short Haul Line
Interface
q Provides a QRSS Test Signal and Error Detector q Impedance Matching Line Driver Using a Single
Transformer (optional)
q No Crystal Needed for Jitter Attenuation q Meets AT&T 62411 and CTR-12 Jitter Tolerance and
Attenuation Requirements
q Meets ANSI T1.231B Requirements for LOS and AIS q Meets the BS6450 Transmitter Short-Circuit Requirements
for E1 Applications
q Compliant with:
- ITU-T Recommendations: G.703, G.704, G.706, G.732, G.775 and I.431 - American National Standards (ANSI): T1.102, T1.105, T1.403, T1.408, and T1.231 - FCC Rules and Regulations: Part 68 and Part 15 - AT&T Publication 62411 - ETSI ETS 300 011, 300 233, CTR 12, TBR 13 - TR-NET-00499
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CS61581
Description Description
The CS61581 is a primary rate line interface unit capable of operation in both short haul (intraoffice) and long haul applications. The CS61581 combines the complete analog transmit and receive circuitry for a single, full-duplex interface at T1 and E1 rates. The device is pin and function compatible with the Level One LXT310 and LXT318. Enhanced functionality is available through an extended register set allowing short haul operation, custom pulse shape generation, QRSS pattern generation, detection and error counting, and generation and detection of loop up and loop down codes. The CS61581 features Crystal's low-power impedance-matched line drivers and crystalless jitter attenuation.
TCLK TDATA/TPOS UBS/TNEG JASEL 2 3 4
11
E N C O D E R
JITTER ATTEN
TRANSMIT TIMING & CONTROL
PULSE SHAPING CIRCUITRY ROM / RAM
13 LINE DRIVERS 16
28 26
TTIP TRING CLKE/TAOS CS/RLOOP SCLK/LLOOP SDI/LBO1 SDO/LBO2
TAOS Enable Q R S S REMOTE/ LOCAL LOOPBACK
LBO Select
SERIAL PORT
27 24 25
REGISTERS & CONTROL LOGIC LOS/ NLOOP Clear LLOOP Enable
SH/LH EQUALIZER CONTROL
LOCAL LOOPBACK 18 SH LATN
RCLK
8
7
RDATA/RPOS
BPV/RNEG
6
D E C O D E R
JITTER ATTEN
TIMING & DATA RECOVERY
SLICERS & PEAK DETECT
NOISE & CROSSTALK FILTERS SH
MAGNITUDE EQUALIZER
19 AGC 20
RTIP RRING
INT/NLOOP
LOS
23 12
INBAND NLOOP & LOS PROCESSOR
RECEIVE CLOCK GENERATOR
1
MCLK
9 XTALIN
10 XTALOUT
5 MODE
21 RV+
22
14
15 TV+
RGND TGND
Overview
The CS61581 Universal Line Interface supports T1 and E1 data rates for both short haul and long haul applications. The transmitter outputs all pulse shapes for T1 and E1 applications, and matches the standard line impedances with a single turns ratio transformer. When configured for long haul operation, the receiver uses gain and equalization to provide 40 dB of sensitivity. The receiver reconfigures for short haul operation, limiting the receive sensitivity to meet industry specifications.
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CS61581
Pin and Function Compatibility
The CS61581 can be operated in stand-alone hardware interface mode, or by a microcontroller in serial host mode. Additional functionality is available in host mode including both short-haul and long-haul operational modes. Upon power up, the CS61581 defaults to long-haul mode with the driver set for low impedance for LXT310, 317, 318 compatibility. The LIU can be reconfigured via the serial port to support multiple modes of operation; T1 or E1, long haul or short haul. Additional functionality available in host mode includes: QRSS generator and receiver capable of transmitting the industry standard T1 and E1 data patterns in either the transmit or receive directions, a data pattern error count register, network loopback detection and generation, impedance matching driver, custom pulse shape generation, and receive signal level detection.
Pin and Function Compatibility
Drop-in replacement for LXT310, LXT317, LXT318 The CS61581 is pin and function compatible with Level One's LXT310 T1, LXT317 DECT, and LXT318 E1 devices. Customers can now modify their existing long-haul only designs to include short-haul functionality simply by changing to the CS61581 and modifying the software that controls the LIU. Customers can also take advantage of the crystalless jitter attenuator offered on the CS61581 and reduce costs by eliminating the crystal or at least replacing the pullable crystal with a less expensive part. The CS61581 vs LXT360 The CS61581 and Level One's LXT360 are functionally similar, but not pin compatible (thought the pinouts are nearly the same). The CS61581 meets or exceeds all the pertinent specifications, and has several advangages over the LXT360:
- the jitter attenuator is CRT12 compliant when the CS61581 is set for E1 operation, - the CS61581 offers impedance matching driver, matching 75 , 100 and 120 impedances depending on the pulse shape selected, no external resistors needed in transmit path,
- detects receiver input signal levels to 2 dB resolution, - meets ISDN LOS signal level requirements for T1 and E1 ISDN PRI applications,
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CS61581
Ordering Information
- the ability to generate and receive test patterns in both directions thereby allowing testability into the system as well as the network, - QRSS sync indicated by register bit, - data pattern errors are counted and stored in an internal register, - the ability to generate user programmable custom pulse shapes, - the ability to output a 6 V pulse required for applications using external passive LBO equalizers, - software control of power down and transmitter tristate functions.
Universal LIU and T1 or E1 Framer For those applications that require framing, Crystal offers framers for T1 and E1 applications, the CS62180B and the CS62181, respectively. These framers, when combined with the CS61581 Universal LIU compare favorably in functionality and board space required for most applications. The Crystal Universal LIU/framer combination is a much less expensive solution compared to the price points of the combo LIU/framer parts offered by the several manufactures. Additionally, the superior performance levels and enhanced features offered by the CS61581 provide numerous advantages to the customer.
Ordering Information
CS61581-IL 28-pin PLCC CS61581-IP 28-pin PDIP Please visit our website "www.crystal.com" or call our literature department (800) 888-5016 ext. 3594 or (512) 912-3594 for data sheets and application notes.
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Sales Office and Applications Support
UNITED STATES Sales Office and Applications Support: WESTERN AREA Cirrus Logic Crystal Semiconductor Div. 50 Airport Pkwy. San Jose, CA 95110 Ph: 408-437-7743 FAX: 408-437-4943
Cirrus Logic Crystal Semiconductor Div. 6 Venture, Ste. 100 Irvine, CA 92718 Ph: 714-453-5910 FAX: 714-453-5914
EUROPE Sales Office and Applications Support:
Cirrus Logic France Immeuble Andre Malraux 93561 Rosny s/s Bois CEDEX, France Ph: +33(148)122812 FAX: +33(148)122810 Cirrus Logic Crystal Semiconductor (UK) Ltd. Spectrum Point, 279 Farnborough Rd., Farnborough, Hampshire GU14 7LS, United Kingdom Ph: +44(0)1252372762 FAX: +44(0)1252372763 Cirrus Logic GmbH Muehlfelder-Strasse 2 D-82211 Herrsching, Germany Ph: +49(08152)92460 FAX: +49(08152)924699
KOREA Cirrus Logic, Korea Co., Ltd. Rm 1302 SangKyung Bldg., 82421 YeokSam-Dong, KangNam-Ku, Seoul, Korea Ph: +82(2)565-8561 FAX: +82(2)565-8565 SINGAPORE Cirrus Logic Crystal International 6 Kaki Bukit Ave. 1, Ste. 03-03 Singapore 417940 Ph: +65-743-4111 FAX: +65-742-4111 TAIWAN Cirrus Logic International Ltd. Taiwan Branch 10F, No.214 Tun Hwa North Rd. Taipei, Taiwan R.O.C. Ph: +886(2)2718-4533 FAX: +886(2)2718-4526
CENTRAL AREA Cirrus Logic Crystal Semiconductor Div. 14205 Burnet Rd., Ste. 400 Austin, TX 78728 Ph: 512-255-8893 FAX: 512-255-0733 EASTERN AREA Cirrus Logic Crystal Semiconductor Div. 5511 Capital Center Dr., Ste. 103 Raleigh, NC 27606 Ph: 919-859-5393 FAX: 919-859-5334
Cirrus Logic 10 New England Business Center, Ste. 100 Andover, MA 01810 Ph: 978-794-9138 FAX: 978-794-9998 Cirrus Logic Crystal Semiconductor Div. 10440 Little Patuxent Pkwy., Ste. 300 Columbia, MD 21044-3559 Ph: 410-740-5654 FAX: 410-740-6961
JAPAN FAR EAST Sales Office and Applications Support: CHINA Cirrus Logic International Ltd. A-1403, Qiancun Commercial Mansion Beijing, China 100029 Ph: (8610)6443-0783 Ph: (8610)6443-0784 Ph: (8610)6443-0785 FAX: (8610)6443-0786 HONG KONG Cirrus Logic International Ltd. 1203 Park Tower 15 Austin Rd., Tsimshatsui Kowloon, Hong Kong Ph: (852)2376-0801 FAX: (852)2375-1202 Sales Office and Applications Support: Cirrus Logic K.K. Shinjuku Green Tower, Bldg. 26F 6-14-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo, 160 Japan Ph: +81(03)3340-9111 FAX: +81(03)3340-9120
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COMMUNICATIONS PRODUCT DIVISION PO BOX 17847 4210 S. INDUSTRIAL DRIVE AUSTIN, TEXAS 78744 512.445.7222 / 800.888.5016 FAX: 512.445.7581 WORLDWIDE WEB: http://www.crystal.com

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