March 1997
ML4662
10BASE-FL Transceiver
GENERAL DESCRIPTION
FEATURES
The ML4662 10Base-FL transceiver combined with the
ML4622 or ML4624 fiber optic quantizers provides all of
the functionality required to implement both an internal
and external IEEE 802.3 10Base-FL MAU. The ML4662
offers a standard IEEE 802.3 AU interface that allows it to
be directly connected to industry standard manchester
encoder/decoder chips or and AUI cable.
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Combined with the ML4622 or ML4624, offers a
complete implementation of an 10Base-FL Medium
Attachment Unit (MAU)
Incorporates an AU interface for use in an external
MAU or an internal MAU
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Single +5 volt supply ±10%
No crystal or clock required
On-chip Jabber, 1MHz idle, and SQE Test with enable/
disable option
Five network status LED outputs
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The ML4662 provides a highly integrated solution that
requires a minimal number of external components, and is
compliant to the IEEE 802.3 10Base-FL standard. The
transmitter offers a current driven output that directly
drives a fiber optic LED transmitter. Jabber, a 1MHz idle
signal, and SQE Test are fully integrated onto the chip.
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The receiver accepts and ECL level input coming from the
ML4622 or ML4624 fiber optic quantizers. The 1MHz idle
signal is removed and the AUI output is activated when
the receive squelch criteria is exceeded. A Link Monitor
function is also provided for low light detection.
BLOCK DIAGRAM
ee M
se S
4
Plea
10
11
4667
L
AUI
RECEIVER
Tx–
+5V
17
SQEN/JABD
Tx+
New
for
igns
Des
12
VCCTx
(+5V)
19
RTSET
NC/PEAK
TxOUT
FIBER OPTIC
LED DRIVER
Tx
SQUELCH
1MHz
IDLE
SIGNAL
18
JABBER
LMONIN
22
SQE
2
3
RECEIVE SQUELCH
FREQUENCY
COL+
AUI
DRIVER
COL–
Rx+
6
Rx–
10MHz GATED
OSCILLATOR
AUI
DRIVER
7
LOOPBACK
MUX
RxIN+
LINE
RECEIVER
RxIN–
GND
RRSET
5
8
13
Rx
CLSN
LBDIS
23
25
Tx
LED
DRIVERS
VCC
(+5V)
26
1
JAB
28
RCV
16
BIAS 27
XMT LMON
15
24
+5V
1
