The DM9161BI is a Industrial-grade physical layer, single-chip, and low power transceiver for 100BASE-TX and 10BASE-T operations. On the media side, it provides a direct interface either to Unshielded Twisted Pair Category 5 Cable (UTP5) for 100BASE-TX Fast Ethernet, or UTP5/UTP3 Cable for 10BASE-T Ethernet. Through the Media Independent Interface (MII), the DM9161BI connects to the Medium Access Control (MAC) layer, ensuring a high inter operability from different vendors.

The DM9161B is a physical layer, single-chip, and low power transceiver for 100BASE-TX and 10BASE-T operations. It supports HP´s Auto MDI-X feature and is available in commercial and industrial temperature range.

• 48 pin LQFP Package
• Current consumption 130mA + 40mA transformer
• Auto MDI-X
• 0.18 µm Process
• LED Status (Link/Activity, Speed, Full Duplex/Collision)
• Full-Duplex or Half-Duplex
• Compatible to IEEE802.3u
• MII and Reverse MII
• SPI EEPROM Interface
• integrated 3.3V to 1.8V regulator
• Temperature Range: 0°C to 70°C and -40° to 85°C

On the media side, it provides a direct interface either to Unshielded Twisted Pair Category 5 Cable (UTP5) for 100BASE-TX Fast Ethernet, or UTP5/UTP3 Cable for 10BASE-T Ethernet. Through the Media Independent Interface (MII), the DM9161B connects to the Medium Access Control (MAC) layer, ensuring a high interoperability from different vendors.
The DM9161B uses a low power and high performance advanced CMOS process.

It contains the entire physical layer functions of 100BASE-TX as defined by IEEE802.3u:

• Physical Coding Sublayer (PCS)
• Physical Medium Attachement (PMA)
• Twisted Pair Physical Medium Dependent Sublayer (TP-PMD)
• 10Base-TX Encoder/Decoder (ENC/DEC) 
• Twisted Pair Media Access Unit (TPMAU)

The DM9161B provides a strong support for the auto-negotiation function, utilizing automatic media speed and protocol selection.
Furthermore, due to the built-in wave shaping filter, the DM9161B needs no external filter to transport signals to the media in 100BASE-TX or 10BASE-T Ethernet operation.