DS125MB203_15 Datasheet, PDF (1/54 Pages) Texas Instruments – Low-Power 12.5-Gbps Dual-Lane 2:1/1:2 Mux/Buffer

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DS125MB203
SNLS432C – OCTOBER 2012 – REVISED DECEMBER 2015
DS125MB203 Low-Power 12.5-Gbps Dual-Lane 2:1/1:2 Mux/Buffer
With Equalization and De-Emphasis
1 Features
•1 12.5-Gbps Dual Lane 2:1 Mux, 1:2 Switch or
Fanout
• Low 390-mW Total Power (Typical)
• Advanced Signal Conditioning Features:
– Receive Equalization up to 30 dB at 6.25 GHz
– Transmit De-Emphasis up to –12 dB
– Transmit Output-Voltage Control: 600 mV to
1300 mV
• Programmable Through Pin Selection, EEPROM
or SMBus Interface
• Selectable 2.5-V or 3.3-V Supply Voltage
• –40°C to +85°C Operating Temperature Range
2 Applications
• 10GE, 10G-KR
• PCIe Gen-1/2/3
• SAS2/SATA3 (Up to 6 Gbps)
• XAUI, RXAUI
Simplified Functional Block Diagram
MB203
D_OUT+
D_OUT-
Address straps
(pull-up to VIN or
pull-down to
GND)⁽¹⁾
D_IN+
D_IN-
AD0
AD1
AD2
AD3
1 OF 2
SMBus Slave Mode⁽¹⁾
SMBus Slave Mode⁽¹⁾
S3M.3BVu₍₃s₎ Slave Mode⁽¹⁾
10 F 1 F
0.1 F
(x5)
SEL0
READ_EN / SEL1
ALL_DONE
VIN (3.3 V)
VDD_SEL
VDD (2.5 V)
S_INA+
S_INA-
S_INB+
S_INB-
S_OUTA+
S_OUTA-
S_OUTB+
S_OUTB-
MODE
ENSMB
SDA⁽²⁾
SCL⁽²⁾
INPUT_EN
RESET
GND (DAP)
GND
SATA/SAS
Mode⁽⁴⁾
VIN
SMBus Slave
Mode⁽¹⁾
To SMBus/I2C
Host Controller
(1) Schematic shows connection for SMBus Slave Mode (ENSMB = 1 k: to VIN)
For SMBus Master Mode or Pin Mode configuration, the connections are different.
(2) SMBus signals must be pulled up elsewhere in the system.
(3) Schematic requires different connections for 2.5 V mode.
(4) Schematic requires pullup resistor for 10G-KR Mode.
3 Description
The DS125MB203 device is a dual port 2:1
multiplexer and 1:2 switch or fan-out buffer with
signal conditioning suitable for 10GE, 10G-KR
(802.3ap), Fibre Channel, PCIe, Infiniband,
SATA3/SAS2 and other high-speed bus applications
with data rates up to 12.5 Gbps. The continuous time
linear equalizer (CTLE) of the receiver provides
necessary boost to compensate up to 30-inch FR-4
or 8-m cable (AWG-24) at 12.5 Gbps. This on-chip
feature eliminates the need for external signal
conditioners. The transmitter features a
programmable amplitude voltage levels to be
selectable from 600 mVp-p to 1300 mVp-p and de-
emphasis of up to 12 dB.
The DS125MB203 can be configured to support
PCIe, SAS/SATA, 10G-KR or other signaling
protocols. When operating in 10G-KR and PCIe Gen-
3 mode, the DS125MB203 transparently allows the
host controller and the end point to optimize the full
link and negotiate transmit equalizer coefficients. This
seamless management of the link training protocol
ensures system level interoperability with minimum
latency.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DS125MB203
WQFN (54)
10.00 mm × 5.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
SEL0
EXPANDER
RX
TX
EXPANDER
RX
TX
MB203
D_OUT0
S_INA0
S_INB0
D_OUT1
S_INA1
S_INA1
D_IN0
S_OUTA0
S_OUTB0
DRIVE 0
TXA_0
DRIVE 1
TXB_0
TXA_1
TXB_1
RXA_0
RXB_0
D_IN1
S_OUTA1
S_OUTB1
RXA_1
RXB_1
SEL1
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.