ML4658

2

PIN# NAME

FUNCTION

1

CLSN

Indicates that a collision is taking place. Active low LED driver, open collector. Event is extended

100ms for visibility.

2

COL+

Gated 10MHz signal used to indicate a collision, SQE test, or jabber. Balanced differential

3

COL–

line driver outputs that meet AU interface specifications. AC or DC coupled.

4

SQEN/LTD/ SQE Test Enable, Link Test Disabled, Jabber Disabled. This input uses four voltage levels to

JABD

configure the chip as shown in Table 1.

Table 1. SQEN/LTD/JABD Pin Configuration

Pin

SQE Test

Link Test

Jabber

0V (GND)

Disabled

Enabled

Enabled

1.2V

Disabled

Disabled

Disabled

BIAS

Enabled

Disabled

Enabled

Enabled

Enabled

Enabled

When link test is disabled, no link pulses are transmitted, and the transmitter and receiver will not be

disabled as a result of a loss of receive link pulses. When Jabber is disabled the transmitter can

transmit continuously without interruption, and the collision oscillator will not be activated.

5

Rx+

Manchester encoded receive data output to the local device. Balanced differential line driver outputs

6

Rx–

that meet AU interface specifications. AC or DC coupled.

5 Volt power input.

8

Tx+

Balanced differential line receiver inputs that meet AU interface specifications. These inputs may be

9

Tx–

AC or DC coupled. When AC coupled, the BIAS pin is used to set the common mode voltage. Signals

meeting the transmitter squelch input requirements are pre-equalized and output on TxTP+ and TxTP–.

10 RTSET

When using 100

using 150

11 RRSET

A 1% 61.9K

PIN DESCRIPTION (DIP)

PIN CONFIGURATION

TOP VIEW

1

2

3

4

5

6

7

8

9

10

11

12

JAB

BIAS

RxTP+

RxTP–

LTF

TxCAP0

TxCAP1

GND

TxTP+

TxTP–

RCV

XMT

24

23

22

21

20

19

18

17

16

15

14

13

CLSN

COL+

COL–

SQEN/LTD/JABD

Rx+

Rx–

Tx+

Tx–

RTSET

RRSET

POLRD

ML4658

24-Pin DIP

4

3

2

1

28

27 26

12 13 14 15 16

17 18

5

6

7

8

9

10

11

RxTP–

LTF

NC

TxCAP0

TxCAP1

GND

GND

25

24

23

22

21

20

19

NC

Rx+

Rx–

Tx+

Tx–

TOP VIEW

ML4658

28-Pin PCC