LAN8740A/LAN8740Ai Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology
●General Description
■The LAN8740A/LAN8740Ai is a low-power 10BASE-T/100BASE-TX physical layer (PHY) transceiver with variable I/O voltage that is compliant with the IEEE 802.3, 802.3u, and 802.3az (Energy Efficient Ethernet) standards. Energy Efficient Ethernet (EEE) support results in significant power savings during low link utilizations.
■The LAN8740A/LAN8740Ai supports communication with an Ethernet MAC via a standard MII (IEEE 802.3u)/RMII interface. It contains a full-duplex 10-BASE-T/100BASE-TX transceiver and supports 10 Mbps (10BASE-T) and 100 Mbps(100BASE-TX) operation. The LAN8740A/LAN8740Ai implements auto-negotiation to automatically determine the best possible speed and duplex mode of operation. HP Auto-MDIX support allows the use of direct connect or cross-over LAN cables. Integrated Wake on LAN (WoL) support provides a mechanism to trigger an interrupt upon reception of a perfect DA, broadcast, magic packet, or wakeup frame.
■The LAN8740A/LAN8740Ai supports both IEEE 802.3-2005 compliant and vendor-specific register functions. However,no register access is required for operation. The initial configuration may be selected via the configuration pins as described in Section 3.7, "Configuration Straps". Register-selectable configuration options may be used to further define the functionality of the transceiver.
■The LAN8740A/LAN8740Ai can be programmed to support wake-on-LAN at the physical layer, allowing detection of configurable Wake-up Frame and Magic packets. This feature allows filtering of packets at the PHY layer, without requiring MAC intervention. Additionally, the LAN8740A/LAN8740Ai supports cable diagnostics which allow the device to identify opens/shorts and their location on the cable via vendor-specific registers.
■Per IEEE 802.3-2005 standards, all digital interface pins are tolerant to 3.6 V. The device can be configured to operate on a single 3.3 V supply utilizing an integrated 3.3 V to 1.2 V linear regulator. The linear regulator may be optionally disabled, allowing usage of a high efficiency external regulator for lower system power dissipation.
●Highlights
■Single-Chip Ethernet Physical Layer Transceiver (PHY)
■Compliant with Energy Efficient Ethernet 802.3az
■Cable diagnostic support
■Wake on LAN (WoL) support
■Comprehensive flexPWR technology
▲Flexible power management architecture
▲LVCMOS Variable I/O voltage range: +1.8 V to +3.3 V
▲Integrated 1.2 V regulator with disable feature
■HP Auto-MDIX support
■Small footprint 32-pin VQFN, RoHS-compliant package (5 x 5 x 0.9 mm height)
■Deterministic 100 Mb internal loopback latency(MII Mode)
●Key Benefits
■High-performance 10/100 Ethernet transceiver
▲Compliant with IEEE802.3/802.3u (Fast Ethernet)
▲Compliant with ISO 802-3/IEEE 802.3 (10BASE-T)
▲Compliant with Energy Efficient Ethernet IEEE 802.3az
▲Loop-back modes
▲Auto-negotiation
▲Automatic polarity detection and correction
▲Link status change wake-up detection
▲Vendor specific register functions
▲Supports both MII and the reduced pin count RMII interfaces
■Power and I/Os
▲Various low power modes
▲Integrated power-on reset circuit
▲Two status LED outputs
▲May be used with a single 3.3 V supply
■Additional Features
▲Ability to use a low cost 25 MHz crystal for reduced BOM
■Packaging
▲32-pin VQFN (5 x 5 mm), RoHS-compliant package with MII and RMII
■Environmental
▲Commercial temperature range (0°C to +70°C)
▲Industrial temperature range (-40°C to +85°C)
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LAN8740A 、 LAN8740Ai 、 LAN8740A-EN 、 LAN8740Ai-EN 、 LAN8740A-EN-TR 、 LAN8740 、 LAN8740i |
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low-power 10BASE-T/100BASE-TX physical layer (PHY) transceiver |
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[ Set-Top Boxes ][ Networked Printers ][ Servers ][ Test Instrumentation ][ LAN on Motherboard ][ Embedded Telecom Applications ][ Video Record Systems ][ Playback Systems ][ Cable Modems ][ Cable Routers ][ DSL Modems ][ DSL Routers ][ Digital Video Recorders ][ IP Phones ][ Video Phones ][ Wireless Access Points ][ Digital Televisions ][ Digital Media Adapters/Servers ][ Gaming Consoles ][ POE Applications ] |
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Datasheet |
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Please see the document for details |
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VQFN;QFN |
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English Chinese Chinese and English Japanese |
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09-07-15 |
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Revision A |
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DS00001987A |
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4.8 MB |
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