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REV: 021004
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GENERAL DESCRIPTION
The DS21354/DS213554 single-chip transceivers
(SCTs) contain all the necessary functions to connect to
E1 lines. The devices are upward-compatible versions
of the DS2153 and DS2154 SCTs. The on-board
clock/data recovery circuitry coverts the AMI/HDB3 E1
waveforms to an NRZ serial stream. Both devices
automatically adjust to E1 22AWG (0.6mm) twisted-
pair cables from 0 to over 2km in length. They can
generate the necessary G.703 waveshapes for both 75W
coax and 120W twisted cables. The on-board jitter
attenuator (selectable to either 32 bits or 128 bits) can
be placed in either the transmit or receive data paths.
The framer locates the frame and multiframe
boundaries and monitors the data stream for alarms. It is
also used for extracting and inserting signaling data, Si,
and Sa-bit information. The on-board HDLC controller
can be used for Sa-bit links or DS0s. The devices
contain a set of internal registers that the user can
access to control the operation of the units. Quick
access through the parallel control port allows a single
controller to handle many E1 lines. The devices fully
meet all 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.
PIN CONFIGURATION
FEATURES
§ Complete E1 (CEPT) PCM-30/ISDN-PRI
Transceiver Functionality
§ On-Board Long- and Short-Haul Line Interface
for Clock/Data Recovery and Waveshaping
§ 32-Bit or 128-Bit Crystal-Less Jitter Attenuator
§ Frames to FAS, CAS, CCS, and CRC4 Formats
§ Integral HDLC Controller with 64-Byte Buffers
Configurable for Sa Bits, DS0, or Sub-DS0
Operation
§ Dual Two-Frame Elastic Store Slip Buffers that
can Connect to Asynchronous Backplanes up to
8.192MHz
§ Interleaving PCM Bus Operation
§ 8-Bit Parallel Control Port that can be used
Directly on Either Multiplexed or
Nonmultiplexed Buses (Intel or Motorola)
§ Extracts and Inserts CAS Signaling
§ Detects and Generates Remote and AIS Alarms
§ Programmable Output Clocks for Fractional E1,
H0, and H12 Applications
§ Fully Independent Transmit and Receive
Functionality
§ Full Access to Si and Sa Bits Aligned with
CRC-4 Multiframe
§ Four Separate Loopback Functions for Testing
Functions
§ Large Counters for Bipolar and Code Violations,
CRC4 Codeword Errors, FAS Word Errors, and
E Bits
§ IEEE 1149.1 JTAG-Boundary Scan Architecture
§ Pin Compatible with DS2154/52/352/552 SCTs
§ 3.3V (DS21354) or 5V (DS21554) Supply; Low-
Power CMOS
§ 100-pin LQFP package (14mm x 14mm)
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS21354L
0°C to +70°C 100 LQFP
DS21354LN -40°C to +85°C 100 LQFP
DS21554L
0°C to +70°C 100 LQFP
DS21554LN -40°C to +85°C 100 LQFP
DS21354/DS21554
3.3V/5V E1 Single-Chip Transceivers
www.maxim-ic.com
1
100
Dallas
Semiconductor
DS21354/DS21554
LQFP
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