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Rack server motherboard

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Block diagram

Rack server motherboard

Block diagram

Overview

Our integrated circuits and reference designs help you quickly create a rack server motherboard design with higher energy efficiency, density, and fast data computing to support the growth of cloud computing and emerging technologies like artificial intelligence and machine learning.

Design requirements

Next-generation rack server motherboards in the datacenter architecture often require:

  • High DC/DC power conversion and protection.
  • Increased density to meet standard rack and OCP rack size requirements.
  • High-bandwidth data throughputs requiring leading-edge signal processing.
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Block diagram

Find products and reference designs for your system.

Rack server motherboard

Power supply unit (PSU) Power supply unit(PSU) JTAG JTAG Platform controller hub (PCH) Platform controller hub (PCH) Voltage reference Voltage reference ESD protection ESD protection PCH uController PCH uController Retimers, redrivers Retimers, redrivers I2C level shifter/repeater I2C level shifter/repeater Little logic Little logic SAS/SATA redriver SAS/SATA redriver PCI/PCIe PHY, bridges PCI/PCIe PHY, bridges USB retimers, redrivers, port controllers USB retimers, redrivers, port controllers eFuse, load switches eFuse, load switches I2C switch I2C switch DC/DC multiphase controller DC/DC multiphase controller JTAG mux JTAGmux Power stage Power stage Clock generator Clock generator Sensing Sensing Temperature sensing Temperature sensing Current sensing Current sensing Memory Memory LDO + multichannel PMIC LDO + multichannel PMIC Power stage Power stage Buck converter single & multi-output Buck converter single & multi-output DC/DC multiphase controller DC/DC multiphase controller DIMM modules DIMM modules CPU CPU DC/DC multiphase controller DC/DC multiphase controller Central processor Central processor Power stage Power stage DC/DC buck converter DC/DC buck converter CPLD/board level sequencer CPLD/board level sequencer Sequencer Sequencer CPLD controller CPLDcontroller Voltage level translation Voltage level translation Board management controller (BMC) Board management controller (BMC) RS-232 RS-232 Voltage level translation Voltage level translation BMC uController BMC uController Little logic Little logic ESD protection ESD protection Clock buffer Clock buffer Ethernet PHY, bridges & retimers Ethernet PHY, bridges & retimers Video, SPI mux Video, SPI mux Oscillator Oscillator ADC ADC System power System power Primary hot swap controller (current protection) Primary hot swap controller (current protection) Standby eFuse Standby eFuse DC/DC buck & multiphase controllers DC/DC buck & multiphase controllers DC/DC buck converters & PMIC DC/DC buck converters & PMIC Sequencer Sequencer MOSFETs MOSFETs Voltage margining and sensing Voltage margining and sensing

Board management controller (BMC)

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The board management controller (BMC) manages the interface between system-management software and platform hardware. It provides intelligence for the Intelligent platform management interface (IPMI) system interfacing over the RS232, I2C and SMBUS to monitor and control items such as temperature, fan speeds, power status and so forth. A system administrator is able to use this information to take pre-emptive action before system failure can occur.

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Clocks & timing (3)
Oscillators
  • CDC6C—Low-power, low-jitter, bulk-acoustic-wave (BAW), fixed-frequency LVCMOS oscillator
    Data sheet: PDF | HTML
  • LMK6C—Low-jitter, high-performance, bulk-acoustic-wave (BAW) fixed-frequency LVCMOS oscillator
    Data sheet: PDF | HTML
  • LMK6H—Low-jitter, high-performance, bulk-acoustic-wave (BAW) fixed-frequency HCSL oscillator
    Data sheet: PDF | HTML
Interface (6)
RS-232 transceivers
  • TRS213E—5V multichannel 120kbps RS-232 line driver/receiver with ±9V output and ±15kV IEC ESD protection
    Data sheet: PDF | HTML
  • MAX3243—3- to 5.5-V multichannel 250kbps RS-232 line driver/receiver with +/-15-kV ESD protection
    Data sheet: PDF | HTML
  • MAX3243E—3- to 5.5-V multichannel 500kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection
    Data sheet: PDF | HTML
  • MAX3232E—3- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection
    Data sheet: PDF | HTML
  • MAX3221—3- to 5.5-V single channel 250kbps RS-232 line driver/receiver with +/-15-kV ESD protection
    Data sheet: PDF | HTML
  • TRS3122E—1.65- to 5.5-V 1Mbps RS-232 line driver/receiver with logic supply pin & +/-15-kV IEC-ESD protection
    Data sheet: PDF | HTML
Passive and discrete (8)
ESD protection diodes
  • TPD4E05U06—Quad 0.5-pF, 5.5-V, ±12-kV ESD protection diode for USB, HDMI & High Speed Interfaces
    Data sheet: PDF | HTML
  • TPD1E10B09—10-pF, ±9V, ±20-kV ESD protection diode with 6-A 8/20-uS surge in 0402 Package
    Data sheet: PDF | HTML
  • TPD4E001—Quad 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0
    Data sheet: PDF | HTML
  • TPD1E1B04—1-pF, ±3.6-V, ±30-kV ESD protection diode with 6.3-A 8/20-uS surge & low clamping in 0402 packa
    Data sheet: PDF | HTML
  • ESD122—Dual 0.2-pF, ±3.6-V, ±17-kV ESD protection diode for USB Type-C and HDMI 2.0
    Data sheet: PDF | HTML
  • TPD1E10B06—12-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package
    Data sheet: PDF | HTML
TVS diodes
Switches & multiplexers (6)
Analog switches & muxes
  • TMUX136—1.4pF on-state capacitance, 3.3V, 2:1 (SPDT), 2-channel analog switch with powered-off protection
    Data sheet: PDF | HTML
  • TMUX1574—5-V, 2:1 (SPDT), 4-channel analog switch with powered-off protection & 1.8-V input logic
    Data sheet: PDF | HTML
  • TMUX1112—3-pA on-state leakage current, 5-V, 1:1 (SPST), 4-channel precision switch (4 active high)
    Data sheet: PDF | HTML
  • SN74LVC1G3157—5-V, 2:1 (SPDT), 1-channel general-purpose analog switch
    Data sheet: PDF | HTML
  • SN74CBTLV3257—3.3-V, 2:1 (SPDT), 4-channel analog switch with partial-power-down mode
    Data sheet: PDF | HTML
  • TMUX1511—5-V, 1:1 (SPST), 4-channel analog switch with powered-off protection & 1.8-V input logic
    Data sheet: PDF | HTML
Amplifiers (6)
Comparators
  • LM2903B—Dual industrial grade standard comparator
    Data sheet: PDF | HTML
  • TL331—High Voltage Single Differential Comparator
    Data sheet: PDF | HTML
  • LM393B—Dual commercial grade standard comparator
    Data sheet: PDF | HTML
  • TLV7042—Dual nanopower comparator with open-drain output
    Data sheet: PDF | HTML
  • TLV7041—Nanopower, small size comparator with open-drain output
    Data sheet: PDF | HTML
  • TLV7031—Nanopower, small size comparator with push-pull output
    Data sheet: PDF | HTML
Data converters (6)
Precision ADCs
  • ADS7142—12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package
    Data sheet: PDF | HTML
  • ADS1219—24-bit, 1kSPS, 4-ch general-purpose delta-sigma ADC with I2C interface and external Vref inputs
    Data sheet: PDF | HTML
  • ADC128D818—12-Bit, 82SPS, 8-Ch Delta-Sigma ADC with Temp Sensor, INT / EXT Voltage Reference & I2C Interface
    Data sheet: PDF | HTML
  • ADS7138—8-channel, 140-kSPS, 12-bit analog-to-digital converter (ADC) with I2C, GPIOs and CRC
    Data sheet: PDF | HTML
  • TLA2024—12-bit, 4-channel, delta-sigma ADC with voltage reference, oscillator, PGA and I2C
    Data sheet: PDF | HTML
  • ADS7046—12-Bit, 3MSPS, Single-Ended Input, Small-Size Low-Power SAR ADC
    Data sheet: PDF | HTML
Logic & voltage translation (18)
AND gates
  • SN74LVC1G08—1-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate
    Data sheet: PDF | HTML
  • SN74LVC1G11-Q1—Automotive, 1-ch, 3-input 1.65-V to 5.5-V 32-mA drive strength AND gate
    Data sheet: PDF | HTML
  • SN74AHC1G09—1-ch, 2-input 2-V to 5.5-V high-speed (9 ns) AND gate with open-drain outputs
    Data sheet: PDF | HTML
  • SN74LV08A—4-ch, 2-input 2-V to 5.5-V high-speed (7 ns) AND gate
    Data sheet: PDF | HTML
  • SN74AUP1G08—1-ch, 2-input 0.8-V to 3.6-V low power (< 1uA) AND gate
    Data sheet: PDF | HTML
  • SN74LVC1G11—1-ch, 3-input 1.65-V to 5.5-V 32 mA drive strength AND gate
    Data sheet: PDF | HTML
Auto-direction voltage translators
  • TXB0304—4-bit Bidirectional Auto-direction Sensing Translator with Fully Symmetric 0.9V to 3.6V Range
    Data sheet: PDF | HTML
  • LSF0102—Dual bidirectional multivoltage level translator
    Data sheet: PDF | HTML
  • LSF0204—4-Bit Bidirectional Multi-Voltage Level Translator for Open-Drain & Push- Pull
    Data sheet: PDF | HTML
  • TXB0104—4-Bit Bidirectional Voltage-Level Shifter with Auto Direction Sensing and +/-15 kV ESD Protect
    Data sheet: PDF | HTML
  • TXS0102—2-Bit Bidirectional Voltage-Level Shifter for Open-Drain and Push-Pull Application
    Data sheet: PDF | HTML
  • LSF0108—Octal bidirectional multi-voltage-level translator
    Data sheet: PDF | HTML
Direction-controlled voltage translators
  • SN74AXC4T774—4-bit dual-supply bus transceiver with 3-state outputs and independent direction control inputs
    Data sheet: PDF | HTML
  • SN74AXC4T774-Q1—Automotive 4-bit 2-supply bus transceiver with 3-state outputs, independent direction control inputs
    Data sheet: PDF | HTML
  • SN74AXC4T245—4-bit dual-supply bus transceiver
    Data sheet: PDF | HTML
  • TXV0108-Q1—Automotive, dual-supply direction-controlled eight-channel voltage translator
    Data sheet: PDF | HTML
  • SN74AXC2T245—Dual-bit, 2-DIR pin dual-supply bus transceiver w/ configurable voltage translation, 3-state output
    Data sheet: PDF | HTML
  • SN74AXCH2T45—2-bit 0.65V to 3.6V AXC dual-supply bus transciever with bus-hold
    Data sheet: PDF | HTML
Power management (12)
USB power switches & charging port controllers
  • TPS2553D—0.075-1.7A adj. ILIMIT 2.5-6.5V 85mΩ USB power switch, active-high, reverse blocking, multi
    Data sheet: PDF | HTML
  • TPS2553—0.075-1.7A adj. ILIMIT, 2.5-6.5V, 85mΩ USB power switch, active-high, reverse blocking
    Data sheet: PDF | HTML
  • TPS2001C—2A loading, 4.5-5.5V, 72mΩ USB power switch, active-high, output discharge, reverse blocking
    Data sheet: PDF | HTML
  • TPS2557—0.5-5A adjustable ILIMIT, 2.5-6.5V, 22mΩ USB power switch, active-high
    Data sheet: PDF | HTML
  • TPS2069C—1.5A loading, 4.5-5.5V, 69mΩ USB power switch, active-high, output discharge, reverse blocking
    Data sheet: PDF | HTML
  • TPS2001D—2A loading, 4.5-5.5V, 72mΩ USB power switch, active-high, output discharge, reverse blocking
    Data sheet: PDF | HTML
Sequencers
  • UCD90160—16-Rail Power Supply Sequencer with ACPI Support
    Data sheet: PDF | HTML
  • UCD90160A—16-Rail PMBus Power Supply Sequencer and System Manager with ACPI Support
    Data sheet: PDF | HTML
  • UCD9081—Power Supply Sequencer and Monitor with Non-Volatile Error Logging
    Data sheet: PDF | HTML
  • UCD90320—32-Rail PMBus Power Sequencer and System Manager
    Data sheet: PDF | HTML
  • LM3881—3 rail simple power sequencer with adjustable time delay
    Data sheet: PDF | HTML
  • UCD90320U—32 rail PMBus power sequencer and system manager with SEU detection
    Data sheet: PDF | HTML

    Technical documentation

    View all 9
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    Type Title Date
    Analog Design Journal System telemetry: What, why and how? 30 Apr 2014
    More literature Advanced Signal Conditioning Made Easy and Efficient 24 Jan 2017
    Application note Noise Analysis for High Speed Op Amps (Rev. A) 19 Jan 2005
    Application note Point-of-Load Solutions for Data Center App Implementing VR13.HC Vccin Spec (Rev. A) PDF | HTML 18 May 2022
    Application note Low Voltage Translation for SPI, UART, RGMII, JTAG Interfaces (Rev. B) PDF | HTML 11 May 2022
    Application brief Enabling SPI-Based Flash Memory Expansion by Using Multiplexers (Rev. B) PDF | HTML 10 May 2022
    Application note Advanced Linear Repeater Used in PCIe 3.0 Add-in Card Compliance Environment 03 Oct 2014
    Application note Achieve 20-A Circuit Protection and Space Efficiency Using Paralleled eFuses 03 Nov 2016
    Analog Design Journal The intricacies of signal integrity in high-speed communications 02 May 2016

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