DS26303
3.3V, E1/T1/J1, Short-Haul,
Octal Line Interface Unit
www.maxim-ic.com
GENERAL DESCRIPTION
FEATURES
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8 Complete E1, T1, or J1 Short-Haul Line
Interface Units
The DS26303 is an 8-channel short-haul line
interface unit (LIU) that supports E1/T1/J1 from a
single 3.3V power supply. A wide variety of
applications are supported through internal
termination or external termination. A single bill of
material can support E1/T1/J1 with minimum external
components. Redundancy is supported through
nonintrusive monitoring, optimal high-impedance
modes, and configurable 1:1 or 1+1 backup
enhancements. An on-chip synthesizer generates the
E1/T1/J1 clock rates by a single master clock input of
various frequencies. Two clock output references are
also offered.
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Independent E1, T1, or J1 Selections
Internal Software-Selectable Transmit and
Receive-Side Termination
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Crystal-Less Jitter Attenuator
Selectable Single-Rail and Dual-Rail Mode
and AMI or HDB3/B8ZS Line Encoding and
Decoding
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Detection and Generation of AIS
Digital/Analog Loss-of-Signal Detection as
per T1.231, G.775, and ETS 300 233
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External Master Clock can be Multiple of
2.048MHz or 1.544MHz for T1/J1 or E1
Operation; This Clock will be Internally
Adapted for T1 or E1 Use
APPLICATIONS
T1 Digital Cross-Connects
ATM and Frame Relay Equipment
Wireless Base Stations
ISDN Primary Rate Interface
E1/T1/J1 Multiplexer and Channel Banks
E1/T1/J1 LAN/WAN Routers
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Built-In BERT Tester for Diagnostics
8-Bit Parallel Interface Support for Intel or
Motorola Mode or a 4-Wire Serial Interface
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Hardware Mode Interface Support
Transmit Short-Circuit Protection
G.772 Nonintrusive Monitoring
FUNCTIONAL DIAGRAM
Software Control,
Hardware Control
Jtag
MODESEL
Specification Compliance to the Latest T1
and E1 Standards—ANSI T1.102, AT&T Pub
62411, T1.231, T1.403, ITU-T G.703, G.742,
G.775, G.823, ETS 300 166, and ETS 300 233
and JTAG
RLOS
RTIP
RPOS
RNEG
RCLK
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Single 3.3V Supply with 5V Tolerant I/O
JTAG Boundary Scan as per IEEE 1149.1
144-Pin eLQFP Package
Receiver
RRING
TPOS
TNEG
TCLK
TTTIP
Transmitter
TRING
ORDERING INFORMATION
1
TEMP RANGE
PIN-PACKAGE
PART
8
DS26303L-XXX
0°C to +70°C
144 eLQFP
DS26303L-XXX+
DS26303LN-XXX
DS26303LN-XXX+
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
144 eLQFP
144 eLQFP
144 eLQFP
DS26303
Note: When XXX is 075, the part defaults to 75Ω impedance in E1
mode; when XXX is 120, the part defaults to 120Ω impedance.
+ Denotes a lead-free/RoHS-compliant package.
e = Exposed Pad.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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