The FW843 and FW842 provide the digital and analog functions needed to implement up to a three-port node in an IEEE 1394 network (FW843 can be used in applications requiring three ports). The FW842 and FW843 are cost effective solutions that include an on-chip voltage regulator to enable operation from a single 3.3 V power supply as well as an on-chip crystal oscillator that only requires an external 24.576MHz crystal. The FW842 56-pin MLCC package provides the industry’s smallest footprint for a 1394b PHY in a leaded package. In addition, both devices offer a common-mode noise filter on the incoming bias detect circuit to filter out crosstalk noise.

The FW843 and FW842 are power-aware solutions, featuring fail-safe circuitry that senses a sudden loss of power to the device. The ports are disabled to ensure that either solution do not load the TPBIAS with any connected device and blocks any leakage from the port back to the power plane. The low-jitter on-chip crystal oscillator provides transmit and receive data at 98.304 Mbits/s, 196.608 Mbits/s, 393.216 Mbits/s, 983.04 Mbits/s, and a link-layer controller clock at 49.152 MHz or 98.304 MHz.

Key Applications

External storage and audio application