ML4663 Просмотр технического описания (PDF) - Micro Linear Corporation

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ML4663

Single Chip 10BASE-FL Transceiver

Micro Linear Corporation 

PIN DESCRIPTION

PIN NAME FUNCTION

1

CLSN

Indicates that a collision is taking

place. Active low LED driver, open

collector. Event is extended with

internal timer for visibility.

2

COL+ Gated 10MHz oscillation used to

3

COL– indicate a collision, SQE test, or

jabber. Balanced differential line

driver outputs that meet AUI

specifications.

4

CTIMER A capacitor from this pin to VCC

determines the Link Monitor

response time.

5 SQEN/JABD SQE Test Enable, Jabber Disable.

When tied low, SQE test is disabled,

when tied high SQE test is enabled.

When tied to 2.0V both SQE test and

Jabber are disabled.

6

Rx+

Manchester encoded receive data

7

Rx–

output to the local device. Balanced

differential line driver outputs that

meet AUI specifications.

8

LBDIS Loopback Disable. When this pin is

tied to VCC, the AUI transmit pair

data is not looped back to the AUI

receive pair, and collision is disabled.

When this pin is tied to GND

(normal operation) or left floating, the

AUI transmit pair data is looped back

to the AUI receiver pair, except

during collision.

9

VCC

+5 volt power input.

10

Tx+

Balanced differential line receiver

11

Tx–

inputs that meet AUI specifications.

These inputs may be transformer or

capacitively coupled. The Tx input

pins are internally DC biased for AC

coupling.

12 RTSET Sets the current driven output of the

transmitter.

13 RRSET A 1% 61.9kΩ resistor tied from this

pin to VCC sets the biasing currents

for internal nodes.

14 LMON Link Monitor “Low Light” LED status

output. This pin is pulled low when

the voltage on the VIN+, VIN– inputs

exceed the minimum threshold set by

the VTHADJ pin, and there are

transitions on VIN+, VIN– indicating

an idle signal or active data. If either

the voltage on the VIN+, VIN– inputs

fall below the minimum threshold or

transitions cease on

LMON will go high.

VIN+, VIN–,

Active low

LED

driver, open collector.

ML4663

PIN NAME

15

XMT

16

RCV

17 VCCTx

18 TxOUT

19 GND

20 GND

21

VDC

22

VREF

23 VTHADJ

24 AGND

25

VIN–

26

VIN+

27

AVCC

28

JAB

FUNCTION

Indicates that transmission is taking

place. Active low LED driver, open

collector. Event is extended with

internal timer for visibility.

Indicates that the transceiver is

receiving a frame from the optical

input. Active low LED driver, open

collector. Event is extended with

internal timer for visibility.

+5 volt supply for fiber optic LED

driver.

Fiber optic LED driver output.

Ground Reference.

Ground Reference.

An external capacitor on this pin

integrates an error signal which

nulls the offset of the input

amplifier. If the DC feedback loop is

not being used, this pin should be

connected to VREF.

A 2.5V reference with respect to

GND.

This input pin sets the link monitor

threshold.

Analog Filtered Ground.

This input pin should be

capacitively coupled to the input

source or to filtered AVCC. (The

input resistance is approximately

1.3kΩ.)

This input pin should be

capacitively coupled to the input

source or to filtered AVCC. (The

input resistance is approximately

1.3kΩ.)

Analog Filtered +5 volts.

Jabber network status LED. When in

the Jabber state, this pin will be low

and the transmitter will be disabled.

In the Jabber “OK” state this pin will

be high. Active low LED, open

collector.

3

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