ML4658 查看數據表（PDF） - Micro Linear Corporation

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ML4658

10BASE-T Transceiver

Micro Linear Corporation 

ML4658

PIN CONFIGURATION

ML4658

24-Pin DIP

CLSN 1

COL+ 2

COL– 3

SQEN/LTD/JABD 4

Rx+ 5

Rx– 6

VCC 7

Tx+ 8

Tx– 9

RTSET 10

RRSET 11

POLRD 12

24 JAB

23 BIAS

22 RxTP+

21 RxTP–

20 LTF

19 TxCAP0

18 TxCAP1

17 GND

16 TxTP+

15 TxTP–

14 RCV

13 XMT

TOP VIEW

ML4658

28-Pin PCC

NC

Rx+

Rx–

VCC

VCC

Tx+

Tx–

4 3 2 1 28 27 26

5

25

6

24

7

23

8

22

9

21

10

20

11

19

12 13 14 15 16 17 18

RxTP–

LTF

NC

TxCAP0

TxCAP1

GND

GND

TOP VIEW

PIN DESCRIPTION (DIP)

PIN# NAME

1 CLSN

FUNCTION

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

100ms for visibility.

2 COL+

3 COL–

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

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

5 Rx+

6 Rx–

7 VCC

8 Tx+

9 Tx–

10 RTSET

11 RRSET

Pin

SQE Test

Link Test

Jabber

0V (GND)

Disabled

Enabled

Enabled

1.2V

Disabled

Disabled

Disabled

BIAS

Enabled

Disabled

Enabled

5V (VCC)

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.

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

that meet AU interface specifications. AC or DC coupled.

5 Volt power input.

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

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–.

When using 100Ω unshielded twisted pair, a 220Ω resistor is tied between this pin and VCC. When

using 150Ω shielded twisted pair, a 330Ω resistor is tied between this pin and VCC.

A 1% 61.9KΩ resistor tied from this pin to VCC is used for internal biasing.

2

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