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DP83959 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DP83959 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 38 page  ©1997 National Semiconductor Corporation www.national.com DP83959 8-Port Lite Ethernet Repeater Interface Controller General Description The DP83959 8-Port Lite Ethernet Repeater Interface Controller (LERIC8) is a single chip solution for unman- aged 10BASE-T Ethernet repeater (hub) products. By inte- grating electronics needed to support eight 10BASE-T ports, a full level/drive compatible 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 components: crystal, transformers, connectors and a power source. The LERIC8 provides on-chip LED drivers that connect di- rectly 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 compatible with the DP83955/6 LERIC™ products. Features s Fully IEEE 802.3 Ethernet Repeater compliant s Eight IEEE 802.3 10BASE-T compliant ports with on-chip transmit filters s One IEEE 802.3 compatible 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 compatible 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 compatible 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 1.0 System Diagram TRI-STATE® is a registered trademark of National Semiconductor Corporation. LERIC™ and Inter-LERIC™ are trademarks of National Semiconductor Corporation. Transformer 10BASE-T Port 1 AUI Port DP83959 LERIC8 Status LEDs (Optional) Inter Repeater Bus (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 10BASE-T Port 2 10BASE-T Port 3 10BASE-T Port 4 10BASE-T Port 5 10BASE-T Port 6 10BASE-T Port 7 10BASE-T Port 8 8-Port Lite Ethernet Repeater Interface Controller Transformer Transformer Transformer Transformer Transformer Transformer Transformer Transformer October 1997 |
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