DS280BR820 Datasheet, PDF (1/8 Pages) Texas Instruments – Low Power 28 Gbps 8 Channel Linear Repeater

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DS280BR820
SNLS537 – AUGUST 2016
DS280BR820 Low Power 28 Gbps 8 Channel Linear Repeater
1 Features
•1 Octal-Channel Multi-Protocol Linear Equalizer
Supporting up to 28 Gbps Interfaces
• Low Power Consumption: 93 mW / Channel
(Typical)
• No Heat Sink Required
• Linear Equalization for Seamless Support of Link
Training, Auto-Negotiation, and FEC Pass-
Through
• Extends Channel Reach by 17 dB+ Beyond
Normal ASIC-to-ASIC Capability
• Ultra-Low Latency: 100 ps (Typical)
• Low Additive Random Jitter
• Small 8-mm x 13-mm BGA Package with
Integrated RX AC Coupling Capacitors for Easy
Flow-Through Routing
• Unique Pinout Allows Routing High-Speed Signals
Underneath the Package
• Pin-Compatible Retimer Available
• Single 2.5-V ±5% Power Supply
• –40°C to +85°C Operating Temperature Range
2 Applications
• Backplane/Mid-Plane Reach Extension
• Front-Port Eye Opener for Optical and Passive
Copper (100G-SR4/LR4/CR4)
• QSFP28, SFP28, CFP2, CFP4, CDFP
3 Description
The DS280BR820 is an extremely low-power, high-
performance eight-channel linear equalizer supporting
multi-rate, multi-protocol interfaces up to 28 Gbps. It
is used to extend the reach and improve the
robustness of high-speed serial links for backplane,
front-port, and chip-to-chip applications.
The linear nature of the DS280BR820’s equalization
preserves the transmit signal characteristics, thereby
allowing the host and link partner ASICs to freely
negotiate transmit equalizer coefficients (100G-
CR4/KR4). This transparency to the link training
protocol facilitates system-level interoperability with
minimal effect on the latency. Each channel operates
independently, which allows the DS280BR820 to
support individual lane Forward Error Correction
(FEC) pass-through.
The DS280BR820's small package dimensions,
optimized high-speed signal escape, and the pin-
compatible Retimer portfolio make the DS280BR820
ideal for high-density backplane applications.
Simplified equalization control, low power
consumption, and ultra-low additive jitter make it
suitable for front-port interfaces such as 100G-
SR4/LR4/CR4. The small 8-mm x 13-mm footprint
easily fits behind numerous standard front-port
connectors like QSFP, SFP, CFP2/CFP4, and CDFP
without the need for a heat sink.
Integrated AC coupling capacitors (RX side) eliminate
the need for external capacitors on the PCB. The
DS280BR820 has a single power supply and minimal
need for external components. These features reduce
PCB routing complexity and bill of materials (BOM)
cost.
A pin-compatible Retimer device is available for
longer reach applications.
The DS280BR820 can be configured either via the
SMBus or through an external EEPROM. Up to 16
devices can share a single EEPROM.
Device Information ⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DS280BR820
nFBGA (135)
8.0 mm x 13.0 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
RX0P
RX0N
...
...
...
RX7P
RX7N
VDD
SMBus
Slave mode ^{1 NŸ}
EN_SMB
TX0P
TX0N
...
TX7P
TX7N
SDA⁽¹⁾
SDC⁽¹⁾
ADDR0
ADDR1
SMBus Slave
mode
2.5V
1 F 0.1 F
(2x)
(4x)
READ_EN_N
VDD
ALL_DONE_N
GND
...
To system SMBus
Address straps
(pull-up, pull-down,
or float)
Float for SMBus Slave
mode, or connect to next
GHYLFH¶V 5($'_EN_N for
SMBus Master mode
(1) SMBus signals need to be pulled up elsewhere in the system.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.