DP83959 Datasheet | National Semiconductor

Description The DP83959 8-Port Lite Ethernet Repeater Interface Controller (LERIC8) is a single chip solution for unmanaged 10BASE-T Ethernet repeater (hub) products. By integrating electronics needed to support eight 10BASE-T ports, a full level/drive patible AUI port for a backbone connection, and an internal power on reset circuit, a LERIC8 based design requires only the addition of a few passive ponents: crystal, transformers, connectors and a power source. The LERIC8 provides on-chip LED drivers that connect directly to LEDs via series resistors. In addition to the Link OK, Port Partition, Global Activity and Global Collision LED outputs, the LERIC8 provides an on chip network traffic level monitor circuit with 8 LED outputs to drive a bargraph type display. The LERIC8 also provides an LED and Inter Repeater Bus interface that is patible with the DP83955/6 LERIC™ products. Features s Fully IEEE 802.3 Ethernet Repeater pliant s Eight IEEE 802.3 10BASE-T pliant ports with on-chip transmit filters s One IEEE 802.3 patible AUI port s Direct drive status LED outputs s Network traffic level monitor with direct drive LED outputs s Automatic internal power-on reset function. External TTL patible reset pin provided for device testing if required s Inter-LERIC™ bus for cascading up to 3 devices on a single board s Register/LED status interface patible with DP83955/6 LERIC™ products s Single 20 MHz crystal or external 20 MHz oscillator module operation s Single 5V supply s 160 pin PQFP package Data Shee . System Diagram Status LEDs (Optional) Per 10BASE-T Port Link & Partition AUI Port Partition Global Activity, Global Collision Network Traffic Bargraph Alert (High Traffic or Long Partition) 20MHz Oscillator or Crystal Inter Repeater Bus (Optional) DP83959 LERIC8 8-Port Lite Ethernet Repeater Interface Controller Transformer Transformer Transformer Transformer Transformer Transformer Transformer Transformer Transformer 10BASE-T Port 1 10BASE-T Port...