DP83849IVS/NOPB
DP83849IVS/NOPB - Dual 10/100 Ethernet PHY, 80-TQFP | Texas Instruments
The Texas Instruments DP83849IVS/NOPB is a dual-port 10/100 Mb/s Ethernet physical layer transceiver (PHYTER DUAL) with flexible port switching, factory-tested and specified for industrial temperature operation in an 80-pin TQFP (PFC) 12 x 12 mm package. It operates from a single 3 V to 3.6 V supply, supports MII, RMII and SNI media interfaces, and draws roughly 180 mA of supply current.
An Ethernet PHY is the physical-layer device that converts digital MAC data into analog signaling over twisted-pair cabling, and back again. Within the network hierarchy it sits below the MAC controller (Ethernet controller -> Ethernet transceiver -> PHY -> magnetics -> RJ45) and is the block that governs link auto-negotiation, line coding, and signal integrity at the connector. A dual-port PHY with flexible port switching lets one physical transceiver serve two independent copper ports, which is valuable in industrial gateways, switches, and test equipment where port count is fixed but routing must be configurable.
Key differentiating features include IEEE 802.3u compliance for 10BASE-T and 100BASE-TX, integrated cable diagnostics, JTAG 1149.1 test support for manufacturing bring-up, and the flexible port switching architecture that allows both ports to be exposed to the host, cascaded, or shared. The industrial temperature range of -40 C to +85 C and the Pb-free (NOPB) ordering code suit equipment that must survive harsh ambient conditions in factory, telecom, and building-automation cabinets.
Technically, the device provides a compliant physical layer for Auto-Negotiation over twisted pair, including support for parallel detection of 10BASE-T and 100BASE-TX speeds. Because the MAC interface supports both MII, RMII and SNI, the same silicon can be paired with a wide range of host controllers, from low-cost 8-bit microcontroller-based gateways to 32-bit application processors with integrated Ethernet MACs. The 80-pin TQFP body exposes both PHY channels, bias networks, LED drivers, strap configuration pins, and reference clock and power planes on a single 0.5 mm pitch footprint.
Typical applications include industrial Ethernet switches and bridges, PLC and factory automation controllers, network-attributed data acquisition equipment, telecom access units, and multi-port instrumentation racks. The DP83849IVS-EVK evaluation module from Texas Instruments is the reference platform for evaluating the device's link performance and port-switching configurations before production board layout.
Designers should note that both PHY channels share a common 3.3 V supply and ground plane, so decoupling and return-path layout discipline matter more than with a single-port PHY. Keep the analog supply filtering and 1.8 V/3.3 V core rails consistent with the reference design, route differential pairs away from switching nodes, and observe the strap resistors before power-up because they define operating mode.
This page consolidates manufacturer specifications, a drop-in cross-reference of compatible 80-pin TQFP PHYs, package details, and practical design notes that are normally spread across the datasheet, evaluation module documentation, and distributor listings.
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