TLK2541 Datasheet, PDF (1/26 Pages) Texas Instruments – 1 TO 2.6 GBPS TRANSCEIVER

TLK2541
www.ti.com...................................................................................................................................................... SLLS779B – JANUARY 2008 – REVISED APRIL 2008
1 TO 2.6 GBPS TRANSCEIVER
FEATURES
1
•2 1 to 2.6 Gigabits Per Second (Gbps)
Serializer/Deserializer
• Independent Transmit/Receive Channels for
Asynchronous Data Rate Operation
• Fast Relock at 1.25 Gbps and 2.5 Gbps for
EPON OLT Applications
• Hot-Plug Protection
• High-Performance 80-Pin TQFP Package (PFP)
• 2.5-V Power Supply for Low Power Operation
• Programmable Preemphasis Levels on Serial
Output
• Interfaces to Backplane, Copper Cables, or
Optical Converters
• On-Chip 8-bit/10-bit Encoding/Decoding
• On-Chip PLL Provides Clock Synthesis From
Low-Speed Reference
• Receiver Differential Input Thresholds 200 mV
Minimum
• 3 V Tolerance on Parallel Data Input Signals
• Selectable 10 or 20 bit Parallel TTL Compatible
Data Interface
• Industrial Temperature Range –40°C to 85°C
• Integrated 50-Ω Termination Resistors on RX
• Transmit FIFO Decouples Transmit Clock
From Reference Clock
APPLICATIONS
• Next Generation EPON OLT Systems
• Ideal for use with EPON OLT MAC Solutions
such as TK3723 from Teknovus
• Gigabit Ethernet and Fibre Channel Links
DESCRIPTION
The TLK2541 is a member of the WizardLink transceiver family of multigigabit transceivers, intended for use in
high-speed bidirectional point-to-point data transmission systems. The TLK2541 supports an effective serial
interface speed of 1 Gbps to 1.3 Gbps or 2 to 2.6 Gbps, providing over 2 Gbps of data bandwidth.
The primary application of this chip is to provide high-speed I/O data channels for point-to-point baseband data
transmission over controlled impedance media of approximately 50Ω. The transmission media can be
printed-circuit board, copper cables, or fiber-optic cable. The maximum rate and distance of data transfer is
dependent upon the attenuation characteristics of the media and the noise coupling to the environment. The
TLK2541 allows for independent transmit and receive data rate operation for applications that need asymmetrical
data rates such as Passive Optical Networking.
This device can also be used to replace parallel data transmission architectures by providing a reduction in the
number of traces, connector terminals, and transmit/receive terminals. Parallel data loaded into the transmitter is
delivered to the receiver over a serial channel, which can be a coaxial copper cable, a controlled impedance
backplane, or an optical link. It is then reconstructed into its original parallel format. It offers significant power and
cost savings over parallel solutions, as well as scalability for higher data rates.
At full rate, the TLK2541 performs data conversion parallel-to-serial and serial-to-parallel. The clock extraction
functions as a physical layer interface device. The serial transceiver interface operates at a maximum speed of
2.6 Gbps. The transmitter latches 20 parallel data at a rate based on the supplied transmit clock (TX_CLK).. The
20-bit word is then transmitted differentially at 20 times the reference clock (REFCLK) rate. The receiver section
performs the serial-to-parallel conversion on the input data, synchronizing the resulting 20-bit wide parallel data
to the recovered clock (RX_CLK). It then outputs the 20 bit recovered word on the receive data terminals
RXD[0:19]. If the internal 8B/10B coding and decoding logic is enabled, 16 bits of data and two bits of control are
latched on TX_CLK and the data is encoded into a 20 bit data word to be serialized. Likewise the 20 bit received
data word is decoded into a 16 bit data word plus two bits of decode status.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated