ML4658
PIN CONFIGURATION
ML4658
28-Pin PCC
ML4658
24-Pin DIP
CLSN
1
24
23
22
21
20
19
18
17
16
15
14
13
JAB
COL+
2
BIAS
COL–
SQEN/LTD/JABD
Rx+
3
RxTP+
RxTP–
LTF
4
3
2
1
28 27 26
NC
Rx+
Rx–
5
25
24
23
22
21
20
19
RxTP–
LTF
4
6
5
7
NC
Rx–
6
TxCAP0
TxCAP1
GND
TxTP+
TxTP–
RCV
V
8
TxCAP0
TxCAP1
GND
GND
CC
CC
V
CC
7
V
9
Tx+
Tx–
8
Tx+
Tx–
10
11
9
RTSET
RRSET
POLRD
10
11
12
12 13 14 15 16 17 18
XMT
TOP VIEW
TOP VIEW
PIN DESCRIPTION (DIP)
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
3
COL+
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
Pin
0V (GND)
1.2V
SQE Test
Disabled
Disabled
Enabled
Enabled
Link Test
Enabled
Disabled
Disabled
Enabled
Jabber
Enabled
Disabled
Enabled
Enabled
BIAS
5V (V
)
CC
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
6
Rx+
Rx–
Manchester encoded receive data output to the local device. Balanced differential line driver outputs
that meet AU interface specifications. AC or DC coupled.
7
V
CC
5 Volt power input.
8
9
Tx+
Tx–
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–.
10 RTSET
11 RRSET
When using 100Ω unshielded twisted pair, a 220Ω resistor is tied between this pin and V . When
CC
using 150Ω shielded twisted pair, a 330Ω resistor is tied between this pin and V
.
CC
A 1% 61.9KΩ resistor tied from this pin to V is used for internal biasing.
CC
2
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
