DS2148 Datasheet, PDF (1/75 Pages) Dallas Semiconductor – 5V E1/T1/J1 Line Interface

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FEATURES
§ Complete E1, T1, or J1 line interface unit
(LIU)
§ Supports both long- and short-haul trunks
§ Internal software-selectable receive-side
termination for 75Ω/100Ω/120W
§ 5V power supply
§ 32-bit or 128-bit crystal-less jitter attenuator
requires only a 2.048MHz master clock for
both E1 and T1 with option to use 1.544MHz
for T1
§ Generates the appropriate line build outs,
with and without return loss, for E1 and
DSX-1 and CSU line build outs for T1
§ AMI, HDB3, and B8ZS, encoding/decoding
§ 16.384MHz, 8.192MHz, 4.096MHz, or
2.048MHz clock output synthesized to
recovered clock
§ Programmable monitor mode for receiver
§ Loopbacks and PRBS pattern generation/
detection with output for received errors
§ Generates/detects in-band loop codes, 1 to 16
bits including CSU loop codes
§ 8-bit parallel or serial interface with optional
hardware mode
§ Multiplexed and nonmultiplexed parallel bus
supports Intel or Motorola
§ Detects/generates blue (AIS) alarms
§ NRZ/bipolar interface for TX/RX data I/O
§ Transmit open-circuit detection
§ Receive Carrier Loss (RCL) indication
(G.775)
§ High-Z State for TTIP and TRING
§ 50mA (rms) current limiter
DS2148/DS21Q48
5V E1/T1/J1 Line Interface
PIN DESCRIPTION
44
1
44 TQFP
7mm
CABGA
ORDERING INFORMATION
Single-Channel Devices:
DS2148TN 44-Pin TQFP (-40°C to +85°C)
DS2148T 44-Pin TQFP (0^o C to +70^o C)
DS2148GN 7mm CABGA (-40°C to +85°C)
DS2148G 7mm CABGA (0^o C to +70^o C)
Four-Channel Devices:
DS21Q48N (Quad) BGA (-40°C to +85°C)
DS21Q48 (Quad) BGA (0^o C to +70^oC)
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REV: 082504