March 1997

ML4662

10BASE-FL Transceiver

GENERAL DESCRIPTION

The ML4662 10Base-FL transceiver combined with the

ML4622 or ML4624 fiber optic quantizers provides all of

the functionality required to implement both an internal

and external IEEE 802.3 10Base-FL MAU. The ML4662

offers a standard IEEE 802.3 AU interface that allows it to

be directly connected to industry standard manchester

encoder/decoder chips or and AUI cable.

The ML4662 provides a highly integrated solution that

requires a minimal number of external components, and is

compliant to the IEEE 802.3 10Base-FL standard. The

transmitter offers a current driven output that directly

drives a fiber optic LED transmitter. Jabber, a 1MHz idle

signal, and SQE Test are fully integrated onto the chip.

The receiver accepts and ECL level input coming from the

ML4622 or ML4624 fiber optic quantizers. The 1MHz idle

signal is removed and the AUI output is activated when

the receive squelch criteria is exceeded. A Link Monitor

function is also provided for low light detection.

FEATURES

s

Combined with the ML4622 or ML4624, offers a

complete implementation of an 10Base-FL Medium

Attachment Unit (MAU)

s

Incorporates an AU interface for use in an external

MAU or an internal MAU

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Single +5 volt supply

±10%

s

No crystal or clock required

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On-chip Jabber, 1MHz idle, and SQE Test with enable/

disable option

s

Five network status LED outputs

BLOCK DIAGRAM

1

RECEIVE SQUELCH

FREQUENCY

LINE

RECEIVER

LED

DRIVERS

LOOPBACK

MUX

AUI

DRIVER

AUI

DRIVER

10MHz GATED

OSCILLATOR

SQE

1MHz

IDLE

SIGNAL

Tx

SQUELCH

AUI

RECEIVER

JABBER

SQEN/JABD

(+5V)

+5V

RTSET

NC/PEAK

TxOUT

RxIN+

RxIN–

BIAS

LBDIS

RRSET

+5V

(+5V)

GND

Rx–

Rx+

COL–

COL+

Tx–

Tx+

Tx

Rx

23

13

8

5

CLSN

1

JAB

28

RCV

16

XMT

15

LMON

24

27

25

26

22

18

19

12

17

4

10

11

2

3

6

7

FIBER OPTIC

LED DRIVER

Please

See ML466

7 for New

Designs