KSZ8721

Please consider this device

Operating at 2.5 volts to meet low voltage and low power requirements, the KSZ8721 is a 10BaseT/100BaseTX/FX Physical Layer Transceiver, which provides an MII to transmit and receive data.

It contains the 10BaseT Physical Medium Attachment (PMA), Physical Medium Dependent (PMD), and Physical Coding Sub-layer (PCS) functions. Moreover, the KSZ8721 has on-chip 10BaseT output filtering, which eliminates the need for external filters and allows a single set of line magnetics to be used to meet requirements for both 100BaseTX and 10BaseT.

The KSZ8721 can automatically configure itself for 100 or 10 Mbps and full or half duplex operation, using on-chip Auto-Negotiation algorithm. It is an ideal choice of physical layer transceiver for 100BaseTX/10BaseT applications.

Microchip's complimentary and confidential LANCheck® online design review service is available for customers who have selected our products for their application design-in. The  is subject to Microchip's  and requires a myMicrochip account.

Features
  • Single chip 100BaseTX/100BaseFX/10BaseT physical layer solution
  • 2.5V CMOS design, power consumption <200mW (excluding output driver current)
  • Fully compliant to IEEE 802.3u standard
  • Supports Media Independent Interface (MII) and Reduced MII (RMII)
  • Supports 10BaseT, 100BaseTX and 100BaseFX with Far_End_Fault Detection
  • Supports power down mode and power saving mode
  • Configurable through MII serial management ports or via external control pins
  • Supports auto-negotiation and manual selection for 10/100Mbps speed and full/half-duplex mode
  • On-chip built-in analog front end filtering for both 100BaseTX and 10BaseT
  • LED outputs for link, activity, full/half duplex, collision, and speed
  • Supports back to back, FX to TX for media converter applications
  • Supports MDI/MDI-X auto crossover
  • 2.5V/3.3V tolerance on I/O
  • Commercial temperature range: 0°C to +70°C
  • Industrial temperature range: –40°C to +85°C
  • Available in 48-pin LQFP, SSOP and TQFP packages
Parameter
Parameter Name Value Value
Description 10/100 Base-TX/FX PHY, Legacy (EtherCAT Ref Design) 10/100 Base-TX/FX PHY, Legacy (EtherCAT Ref Design)
Ethernet Bandwidth 10Base-T/ 100Base-TX / FX 10Base-T/ 100Base-TX / FX
Op. Voltage (V) 3.3 3.3
LEDs 4 4
# of Ethernet Ports 1 1
Interface MII/RMII MII/RMII
Temp. Range Min. (°C) -40 -40
Temp. Range Max. (°C) 85 85
HP-Auto MDIX Yes Yes
Fiber Support 100FX 100FX
Interface1 MII, RMII MII, RMII
Supply Voltage (V) 3.3 3.3
Vdd I/O (V) 2.5/3.3 2.5/3.3
Cable Diagnostics Yes Yes
Supports EtherCAT X X
Documents
KSZ8721B-BT Data SheetData Sheets04/19/20162465KB
KSZ8721BL Data SheetData Sheets04/19/2016311KB
KSZ8721CL Data SheetData Sheets04/19/2016275KB
AN2157 - Transient Protection in Power Over Ethernet ApplicationsAppNote05/24/2016229KB
Micrel AN 109 - Unmanaged Ethernet Redundant RingAppNote10/02/201567KB
Micrel AN 114 - Virtual LANAppNote10/02/201585KB
Micrel AN 13 - Design Guide for InterchangeabilityAppNote10/01/2015113KB
Micrel AN 24 - Ethernet over POFAppNote10/01/2015149KB
Micrel AN 25 - EtherSynch - Synchronization PerfectedAppNote10/01/2015267KB
Micrel AN 27 - Fast Ethernet: Delivery of Data in Industrial ApplicationsAppNote10/01/2015108KB
Micrel AN 31 - General PCB Design and Layout GuidelinesAppNote10/01/2015104KB
Micrel AN 32 - Get in Sync!AppNote10/01/20151432KB
Micrel AN 44 - Interfacing Fast Ethernet to ProcessorsAppNote10/01/2015149KB
Micrel AN 45 - Interfacing Fast Ethernet Transceivers to MAC ProcessorsAppNote10/01/2015122KB
Micrel AN 8 - Capacitive Coupling Ethernet Transceivers without Using TransformersAppNote09/30/2015103KB
Micrel AN 81 - PHY Speed and Duplex ConfigurationAppNote10/02/2015132KB
Micrel AN 91 - Reducing Maintenance Costs With Cable Diagnosis and Micrels LinkMDAppNote10/02/2015420KB
Driver is located in Linux KernelSoftware Library02/01/2016
KS8721B-BT_v1.1_DP.zipDesign Guides02/19/20161456KB
KS8721BL-SL_v1.1_DP.zipDesign Guides02/19/2016966KB
KS8721CL_v1.1_DP.zipDesign Guides02/19/2016781KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
KSZ8721B48SSOP0C to +70CTUBE2.912.432.212.041.93
KSZ8721BI48SSOP-40C to +85CTUBE3.202.662.422.242.12
KSZ8721BI-TR48SSOP-40C to +85CT/R3.202.662.422.242.12
KSZ8721BL48LQFP0C to +70CTRAY3.633.032.752.542.41
KSZ8721BLI48LQFP-40C to +85CTRAY4.073.393.082.852.70
KSZ8721BLI-TR48LQFP-40C to +85CT/R4.073.393.082.852.70
KSZ8721BL-TR48LQFP0C to +70CT/R3.633.032.752.542.41
KSZ8721BT48TQFP0C to +70CTRAY2.922.432.212.041.94
KSZ8721B-TR48SSOP0C to +70CT/R2.922.432.212.041.94
KSZ8721CL48LQFP0C to +70CTRAY3.633.032.752.542.41
KSZ8721CL-TR48LQFP0C to +70CT/R3.633.032.752.542.41
KSZ8721SL48SSOP0C to +70CTUBE3.633.032.752.542.41
KSZ8721SLI48SSOP-40C to +85CTUBE4.073.393.082.852.70
KSZ8721SLI-TR48SSOP-40C to +85CT/R4.073.393.082.852.70
KSZ8721SL-TR48SSOP0C to +70CT/R3.633.032.752.542.41
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
KSZ8721BLI0.1555000.69400048LQFP7x7x1.4mmMatte Tine3
KSZ8721BL0.1555000.69400048LQFP7x7x1.4mmMatte Tine3
KSZ8721BLI-TR0.1555000.76800048LQFP7x7x1.4mmMatte Tine3
KSZ8721CL-TR0.1555000.76800048LQFP7x7x1.4mmMatte Tine3
KSZ8721BL-TR0.1555000.76800048LQFP7x7x1.4mmMatte Tine3
KSZ8721CL0.1555000.69400048LQFP7x7x1.4mmMatte Tine3
KSZ8721BI1.36666748SSOP5.3mmMatte Tine3
KSZ8721SL1.36666748SSOP5.3mmMatte Tine3
KSZ8721B1.36666748SSOP5.3mmMatte Tine3
KSZ8721BI-TR1.43800048SSOP5.3mmMatte Tine3
KSZ8721SLI-TR1.43800048SSOP5.3mmMatte Tine3
KSZ8721B-TR1.43800048SSOP5.3mmMatte Tine3
KSZ8721SL-TR1.43800048SSOP5.3mmMatte Tine3
KSZ8721SLI1.36666748SSOP5.3mmMatte Tine3
KSZ8721BT0.1252000.85200048TQFP7x7x1.0mmMatte Tine3
KSZ8721B-BT Data Sheet KSZ8721
KSZ8721BL Data Sheet KSZ8721
KSZ8721CL Data Sheet KSZ8721
AN2157 LAN9353
Micrel AN 109 KSZ8995
Micrel AN 114 KSZ8999
Micrel AN 13 KSZ8721
Micrel AN 24 KSZ8999
Micrel AN 25 KSZ8999
Micrel AN 27 KSZ8997
Micrel AN 31 KSZ8999
Micrel AN 32 KSZ8999
Micrel AN 44 KSZ8999
Micrel AN 45 KSZ8993
Micrel AN 8 KSZ8999
Micrel AN 81 KSZ8895
Micrel AN 91 KSZ8999
KS8721B-BT_v1.1_DP.zip KSZ8721
KS8721BL-SL_v1.1_DP.zip KSZ8721
KS8721CL_v1.1_DP.zip KSZ8721
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