ML4665
PIN DESCRIPTION
PIN
NAME
FUNCTION
PIN
NAME
FUNCTION
1
LBDIS
Loopback disable. When this pin is
11
LMON
Link Monitor “Low Light” LED status
output. This pin is pulled low when
tied to V , the AUI transmit pair
CC
data is not looped back to the AUI
receive pair. The ML4665 will now
operate in the full duplex mode.
When tied to GND or left floating,
the AUI transmit pair data is looped
back to the AUI receive pair, except
during collision. The ML4665 will
now operate in the half duplex
mode.
the voltage on the V +, V – inputs
IN IN
exceed the minimum threshold and
there are transitions on V +, V –
IN
IN
indicating an idle signal or active
data. If either the voltage on the
V +, V – inputs fall below the
IN
IN
minimum threshold or transitions
cease on V +, V –, LMON will go
IN
IN
high. Active low LED driver, open
collector.
2
3
COL+
COL–
Gated 10MHz oscillation used to
indicate a collision or jabber.
Balanced differential line driver
outputs that meet AUI specifications.
12
V
Tx
+5 volt supply for fiber optic LED
driver.
CC
13
14
15
TxOUT
GND
Fiber optic LED driver output.
Ground Reference.
4
5
Rx+
Rx–
Manchester encoded receive data
output to the local device. Balanced
differential line driver outputs that
meet AUI specifications.
C
TIMER
A capacitor from this pin to V
determines the Link Monitor
response time.
CC
6
V
CC
+5 volt power input.
16
V
An external capacitor on this pin
integrates an error signal which
nulls the offset of the input
DC
7
8
Tx+
Tx–
Balanced differential line receiver
inputs that meet AUI specifications.
These inputs may be transformer or
capacitively coupled. The Tx input
pins are internally DC biased for AC
coupling.
amplifier. If the DC feedback loop
is not being used, this pin should
be connected to V
.
REF
17
18
AGND
V –
Analog Filtered Ground.
9
RTSET
RRSET
Sets the current driven output of the
transmitter.
This input pin should be
IN
capacitively coupled to the input
10
A 1% 61.9kΩ resistor tied from this
source or to filtered AV . (The
CC
pin to V sets the biasing currents
input resistance is approximately
CC
for internal nodes.
1.3kΩ.)
19
20
V +
This input pin should be
IN
capacitively coupled to the input
source or to filtered AV . (The
CC
input resistance is approximately
1.3kΩ.)
AV
Analog Filtered +5 volts.
CC
3
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
