DM9161 Datasheet

10/100 Mbps Fast Ethernet Physical Layer TX/FX Single Chip Transceiver


The DM9161 is a physical layer, single-chip, and low power transceiver for 100BASE-TX 100BASE-FX 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 DM9161 connects to the Medium Access Control (MAC) layer, ensuring a high inter-operability from different vendors. The DM9161 uses a low power and high performance CMOS process. It contains the entire physical layer functions of 100BASE-TX as defined by IEEE802.3u, including the Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA), Twisted Pair Physical Medium Dependent Sublayer (TP-PMD), 10BASE-TX Encoder/Decoder (ENC/DEC), and Twisted Pair Media Access Unit (TPMAU). The DM9161 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 DM9161 needs no external filter to transport signals to the media in 100BASE-TX or 10BASE-T Ethernet operation. DM9161Features • Fully complies with IEEE 802.3u 10Base-T/100Base-TX/FX• Support Auto-Negotiation function, compliant with IEEE 802.3u• Fully integrated Physical layer single chip with direct interface to magnetic• Integrated 10Base-T and 100Base-TX transceiver• Selectable repeater or node mode• Far end fault signaling option in FX mode• Selectable MII or RMII (Reduced MII) interface, at he 100BASE-TX• Selectable GPSI (7-Wired) or MII mode at the 10Base-T.• Selectable twisted-pair or fiber mode output• Selectable full-duplex or half-duplex operation• MII management interface with maskable interrupt output capability• Provide Loopback mode for easy system diagnostics• LED status outputs indicate Link/ Activity, Speed10/100 and Full-duplex/Collision.• Single low power Supply of 3.3V with 0.35μm CMOS technology• Very Low Power consumption modes: -Power Reduced mode (cable detection) -Power Down mode -Selectable TX drivers for 1:1 or 1.25:1 transformers for additional power reduction.• Compatible with 3.3V and 5.0V tolerant I/Os• 48-pin LQFP small package (1x1 cm)


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