DP83959 Datasheet, PDF (1/38 Pages) National Semiconductor (TI) – 8-Port Lite Ethernet Repeater Interface Controller

October 1997
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
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 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
AUI
Port
TRI-STATE^® is a registered trademark of National Semiconductor Corporation.
LERIC^™ and Inter-LERIC^™ are trademarks of National Semiconductor Corporation.
©1997 National Semiconductor Corporation
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