78P2352
Dual Channel
OC-3/ STM1-E/ E4 LIU
PRELIMINARY DATASHEET
FEBRUARY 2004
DESCRIPTION
The 78P2352 is TDK’s second generation Line
Interface Unit (LIU) for 155 Mbit/s SDH/SONET (OC-
3, STS-3, or STM-1) and 140 Mbit/s PDH (E4)
applications. The device is a dual channel, single
chip solution that includes an integrated CDR in the
transmit path for flexible NRZ to CMI conversion.
The device can interface to 75Ω coaxial cable using
CMI coding or directly to a fiber optics module using
NRZ coding. The 78P2352 is compliant with all
respective ANSI, ITU-T, and Telcordia standards for
jitter tolerance, generation, and transfer.
APPLICATIONS
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Central Office Interconnects
DSLAMs
Add Drop Multiplexers (ADMs)
Multi Service Switches
FEATURES
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BLOCK DIAGRAM
Lock Detect
SIxDP/N
SIxCKP/N
PIxCK
PIx[3:0]D
PTOxCK
Tx CDR
EACH CHANNEL: Tx
ECLxP/N
G.703 compliant, adjustable cable driver for
139.264 Mbps or 155.52 Mbps CMI-coded coax
transmission
Integrated adaptive CMI equalizer and CDR in
receive path handles over 15dB of cable loss
Serial, LVPECL system interface with integrated
CDR in transmit path for flexible NRZ to CMI
conversion.
4-bit parallel CMOS system interface with
master/slave Tx clock modes.
Selectable LVPECL compatible NRZ line
interface for 155.52 Mbps optical transmission.
Configurable via HW control pins or 4-wire serial
port interface
Optional fixed backplane equalizer compensates
for up to 1.5m of trace
Compliant with ANSI T1.105.03-1994; ITU-T
G.751, G.813, G.823, G.825, G.958; and
Telcordia GR-253-CORE for jitter performance.
Loss of Lock (LOL) and standards compliant
Loss of Signal (LOS) detection.
Receive Monitor Mode handles up to 20dB of
flat loss (at max 6dB cable loss)
Operates from a single 3.3V supply
Standard and thermally enhanced 128-pin
JEDEC LQFP
FIFO
CMI
Encoder
TXxCKP/N
CMIxP/N
PMOD, SMOD[1:0], PAR
RLBK
SOxCKP/N
SOxDP/N
POx[3:0]D
POxCK
CMI
Decoder
Rx CDR
Lock Detect
CMI
EACH CHANNEL: Rx
Adaptive
Eq.
RXxP/N
LOS Detect
LLBK
1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
