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ML4668 Datasheet(PDF) 3 Page - Micro Linear Corporation

Part No. ML4668
Description  Low Power Single Chip 10BASE-FL Transceiver
Download  14 Pages
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Maker  MICRO-LINEAR [Micro Linear Corporation]
Homepage  http://www.microlinear.com
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ML4668 Datasheet(HTML) 3 Page - Micro Linear Corporation

 
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3
ML4668
PIN
NAME
FUNCTION
15
XMT
Indicates that transmission is taking
place. Active low LED driver, open
collector. Event is extended with
internal timer for visibility.
16
RCV
Indicates that the transceiver is
receiving a frame from the optical
input. Active low LED driver, open
collector. Event is extended with
internal timer for visibility.
17
VCCTx
+5 volt supply for fiber optic LED
driver.
18
TxOUT
Fiber optic LED driver output.
19
GND
Ground Reference.
20
GND
Ground Reference.
21
VDC
An external capacitor on this pin
integrates an error signal which
nulls the offset of the input
amplifier. If the DC feedback loop is
not being used, this pin should be
connected to VREF.
22
VREF
A 2.5V reference with respect to
GND.
23
VTHADJ
This input pin sets the link monitor
threshold.
24
AGND
Analog Filtered Ground.
25
VIN
This input pin should be
capacitively coupled to the input
source or to filtered AVCC. (The
input resistance is approximately
1.3k
Ω.)
26
VIN+
This input pin should be
capacitively coupled to the input
source or to filtered AVCC. (The
input resistance is approximately
1.3k
Ω.)
27
AVCC
Analog Filtered +5 volts.
28
JAB
Jabber network status LED. When in
the Jabber state, this pin will be low
and the transmitter will be disabled.
In the Jabber “OK” state this pin will
be high. Active low LED, open
collector.
PIN DESCRIPTION
PIN
NAME
FUNCTION
1
CLSN
Indicates that a collision is taking
place. Active low LED driver, open
collector. Event is extended with
internal timer for visibility.
2
COL+
Gated 10MHz oscillation used to
3
COL–
indicate a collision, SQE test, or
jabber. Balanced differential line
driver outputs that meet AUI
specifications.
4CTIMER
A capacitor from this pin to VCC
determines the Link Monitor
response time.
5
SQEN/JABD SQE Test Enable, Jabber Disable.
When tied low, SQE test is disabled,
when tied high SQE test is enabled.
When tied to 2.0V both SQE test and
Jabber are disabled.
6
Rx+
Manchester encoded receive data
7
Rx–
output to the local device. Balanced
differential line driver outputs that
meet AUI specifications.
8
LBDIS
Loopback Disable. When this pin is
tied to VCC, the AUI transmit pair
data is not looped back to the AUI
receive pair, and collision is disabled.
When this pin is tied to GND
(normal operation) or left floating, the
AUI transmit pair data is looped back
to the AUI receiver pair, except
during collision.
9VCC
+5 volt power input.
10
Tx+
Balanced differential line receiver
11
Tx–
inputs that meet AUI specifications.
These inputs may be transformer or
capacitively coupled. The Tx input
pins are internally DC biased for AC
coupling.
12
RTSET
Sets the current driven output of the
transmitter.
13
RRSET
A 1% 61.9k
Ω resistor tied from this
pin to VCC sets the biasing currents
for internal nodes.
14
LMON
Link Monitor “Low Light” LED status
output. This pin is pulled low when
the voltage on the VIN+, VIN– inputs
exceed the minimum threshold set by
the VTHADJ pin, and there are
transitions on VIN+, VIN– indicating
an idle signal or active data. If either
the voltage on the VIN+, VIN– inputs
fall below the minimum threshold or
transitions cease on VIN+, VIN–,
LMON will go high. Active low LED
driver, open collector.


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