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DS21Q50N Datasheet

  • DS21Q50N

  • Telecommunication IC

  • 321.20KB

  • 99頁

  • ETC

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DS21Q50
Quad E1 Transceiver
www.dalsemi.com
PRELIMINARY
FEATURES
摟
摟
摟
摟
摟
摟
摟
摟
摟
摟
摟
摟
摟
摟
4 complete E1 (CEPT) PCM-30/ISDN-PRI
transceivers
Long and short haul line interfaces
32-bit or 128-bit crystal-less jitter attenuator
Frames to FAS, CAS, CCS, and CRC4 formats
4/8/16MHz clock synthesizer
Flexible system clock with automatic source
switching on loss of clock source
Two鈥揻rame elastic store slip buffer on the receive
side
Interleaving PCM bus operation up to 16.384MHz
Configurable parallel and serial port operation
Detects and generates remote and AIS alarms
Fully independent transmit and receive functionality
Four separate loopback functions
PRBS generation/detection/error counting
3.3V low power CMOS
100-PIN
LQFP
100
1
ORDERING INFORMATION
DS21Q50L:
100-pin 14mm LQFP (0
0
C to 70
0
C)
DS21Q50LN:
100-pin 14mm LQFP (-40
0
C to 85
0
C)
摟
摟
摟
Large counters for bipolar and code
violations, CRC4 code word errors, FAS
word errors, and E bits
8 additional user configurable output pins.
100-pin LQFP package (14mm)
DESCRIPTION
The DS21Q50 E1 Quad Transceiver contains all of the necessary functions for connection to 4 E1 lines. The
onboard clock/data recovery circuitry coverts the AMI/HDB3 E1 waveforms to an NRZ serial stream. The
DS21Q50 automatically adjusts to E1 22AWG (0.6 mm) twisted鈥損air cables from 0 to over 2km in length. The
device can generate the necessary G.703 waveshapes for both 75 ohm coax and 120 ohm twisted pair cables.
The onboard jitter attenuators (selectable to either 32 bits or 128 bits) can be placed in either the transmit or
receive data paths. The framers locate the frame and multiframe boundaries and monitor the data streams for
alarms. The device contains a set of internal registers, which the user can access and control the operation of the
unit via the parallel control port or serial port. The device fully meets all of the latest E1 specifications including
ITU-T G.703, G.704, G.706, G.823, G.732, and I.431, ETS 300 011, 300 233, and 300 166, as well as
CTR12 and CTR4.
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