ML4662 Просмотр технического описания (PDF) - Micro Linear Corporation

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Компоненты Описание

производитель

ML4662

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 SQEN/JABD SQE Test Enable, Jabber Disable.

When tied low, SQE test is disabled,

when tied high SQE test is enabled.

When tied to BIAS both SQE test and

Jabber are disabled.

5

GND Ground reference

6

Rx+

Manchester encoded receive data

7

Rx–

output to the local device. Balanced

differential line driver outputs that

meet AUI specifications.

8

VCC

+5 volt power input.

9

VCC

10

Tx+

Balanced differential line receiver

11

Tx–

inputs that meet AUI specifications.

These inputs may be transformer, AC

or DC coupled. When transformer or

AC coupled, the BIAS pin is used to

set the common mode voltage

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

NC

No Connection

15

XMT

Indicates that transmission is taking

place. Active low LED driver, open

collector. Event is extended with

internal timer for visibility.

16

RCV

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.

17 VCCTx +5 volt supply for LED driver.

18 TxOUT Fiber optic LED driver output.

ML4662

PIN NAME

19 NC/PEAK

20 GND

21 GND

22 LMONIN

23 LBDIS

24 LMON

25 RxIN–

26 RXIN+

27

BIAS

28

JAB

FUNCTION

Normally this pin can be left

floating. (tying it to GND or VCC is

OK too.) Some fiber optic LEDs may

need an additional peaking circuit

to speed-up the rise and fall times.

For this case, tie pin 19 (NC/PEAK)

to pin 18 (TxOUT). When using the

HP HFBR 1414, let pin 19 float.

Using the peaking circuit may

deteriorate optical overshoot and

undershoot.

Ground reference.

Ground reference.

Link Monitor Input from the

ML4622 or ML4624. This input

must be low (active) for the receiver

to unsquelch.

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), the AUI

transmit pair data is looped back to

the AUI receiver pair.

Link Monitor LED status output.

This pin is pulled low when

LMONIN is low and there are

transitions on RxIN± indicating and

idle signal or active data. If either

LMONIN

cease on

goes high or transitions

RxIN±, LMON will go

high, Active low LED driver, open

collector.

Fiber optic receive pair. This ECL

level signal is received from the

ML6422 or ML4624 fiber optic

quantizer. When this signal exceeds

the receive squelch requirements,

and the LMONIN input is low, the

receive data is buffered and sent to

the AUI receive outputs.

BIAS output voltage for the AUI

Tx+, Tx– inputs when they are AC

coupled.

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. Open collector TTL output.

3

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