DP83959 datasheet(5/38 Pages) NSC

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4.0

Pin Descriptions

Key to Pin Type:

4.1

AUI PORT (PORT 0)

4.2

TWISTED PAIR PORTS (PORTS 1 - 8)

O = TTL Compatible Output

I/O = TTL Compatible Input/Output

O (ECL) = ECL Compatible Output

I/O (O.D.) = TTL Compatible Input/Open Drain Output

I = TTL Compatible Input

TPO = Twisted Pair Interface Compatable Output

I (ECL) = ECL Compatible Input

TPI = Twisted Pair Interface Compatable Input

OZ = TTL Compatible TRI-STATE® Output

AI = Analog Input

O (O.D.) = Open Drain Output

Signal Name

Type

Pin #

Description

TX0+

(ECL)

AUI Transmit +: The AUI transmit path includes National Semiconductor's

patented low power dissipation differential drivers that do not need external load

resistors. This output should be connected directly to the AUI isolation transformer.

TX0-

(ECL)

AUI Transmit -: The AUI transmit path includes National Semiconductor's patented

low power dissipation differential drivers that do not need external load resistors.

This output should be connected directly to the AUI isolation transformer.

RX0+

(ECL)

AUI Receive +: This input should be terminated with 39

Ω to GND via a series DC

blocking capacitor (shared with RX0-). Refer to Figure 8.

RX0-

(ECL)

AUI Receive -: This input should be terminated with 39

Ω to GND via a series DC

blocking capacitor (shared with RX0+). Refer to Figure 8.

CD0+

(ECL)

AUI Collision Detect +: This input should be terminated with 39

Ω to GND via a

series DC blocking capacitor (shared with CD0-). Refer to Figure 8.

CD0-

(ECL)

AUI Collision Detect -: This input should be terminated with 39

Ω to GND via a

series DC blocking capacitor (shared with CD0+). Refer to Figure 8.

Signal Name

Type

Pin #

Description

REQ

108

Equalization Resistor: A resistor connected between this pin and GND or VCC

adjusts the equalization step amplitude on the 10BASE-T Manchester encoded

transmit data for all eight 10BASE-T ports. No resistor is required for operation with

cable length of up to 100 meters.

RTX

107

Extended Cable Resistor: A resistor connected between this pin and GND or VCC

adjusts the amplitude of the differential transmit outputs for all eight 10BASE-T

ports. No resistor is required for operation with cable length of up to 100 meters.

DP83959 Datasheet(PDF) 5 Page - National Semiconductor (TI)

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