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LXT9883/9863 — Advanced 10/100 Unmanaged Repeater

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

3.0

Functional Description

3.1

Introduction

As a fully integrated IEEE 802.3 compliant repeater capable of 10 Mbps and 100 Mbps operation,

the LXT98x3 is a versatile device allowing great flexibility in Ethernet design solutions. Figure 3

shows a typical application. Refer to "Application Information” on page 32. for specific circuit

implementations.

102

RBIAS

RBIAS. Used to provide bias current for internal circuitry. The 100

µA bias

current is provided through an external 22.1 k

Ω, 1% resistor to GND.

RPS_PRES

Redundant Power Supply Present. Active High input indicates presence of

redundant power supply. Tie Low if not used.

RPS_FAULT

Redundant Power Supply Fault. Active Low input indicates redundant power

supply fault. The state of this input is reflected in the RPS_LED output (refer to

LED section). Tie High if not used.

Table 7.

Miscellaneous Signal Descriptions

Symbol

Type1, 2

Description

RESET

Schmitt

Reset. This active Low input causes internal circuits, state machines and

counters to reset (address tracking registers do not reset). On power-up,

devices should not be brought out of reset until the power supply stabilizes to

3.3V. When there are multiple devices, it is recommended all be supplied by

a common reset driven by an ‘LS14 or similar device.

CLK25

Schmitt

25 MHz system clock. Refer to Table 21 on page 44.

FPS

TTL

First Position Select. In multi-chip configurations, this pin identifies one

device on each board that drives the HOLDCOL signal to extend non-local

collisions to other devices on the board. Set Low for first device on the PCB.

Set High for all other devices on the PCB.

25, 33, 51, 52,

55-60, 63-71,

73, 178, 182,

198, 201

N/C

No Connects. Leave these pins unconnected.

1. I = Input, O = Output, I/O = Input/Output, D = Digital, A = Analog, AI = Analog Input, A I/O = Analog Input/Output, OD = Open

Drain,

OS = Open Source, PD = Pull Down, PU = Pull Up.

NC = No Clamp. Pad does not clamp input in the absence of power.

2. Pins are 5V tolerant, unless indicated.

Table 6.

Power Supply and Indication Signal Descriptions (Continued)

Symbol

Type

1, 2

Description

1. I = Input, O = Output, I/O = Input/Output, D = Digital, A = Analog, AI = Analog Input, A I/O = Analog Input/Output, OD = Open

Drain,

OS = Open Source, PD = Pull Down, PU = Pull Up.

NC = No Clamp. Pad does not clamp input in the absence of power.

2. Pins are 5V tolerant, unless indicated.

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