ML4662 Просмотр технического описания (PDF) - Micro Linear Corporation
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ML4662 Datasheet PDF : 12 Pages
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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.
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.
s Combined with the ML4622 or ML4624, offers a
complete implementation of an 10Base-FL Medium
Attachment Unit (MAU)
s Incorporates an AU interface for use in an external
MAU or an internal MAU
s Single +5 volt supply ±10%
s No crystal or clock required
s On-chip Jabber, 1MHz idle, and SQE Test with enable/
disable option
s Five network status LED outputs
Please See ML4667 for New Designs 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
+5V
10 Tx+
11 Tx–
4
SQEN/JABD
AUI
RECEIVER
17
12
VCCTx RTSET
(+5V)
FIBER OPTIC
LED DRIVER
19
NC/PEAK
TxOUT
18
Tx
SQUELCH
1MHz
IDLE
SIGNAL
JABBER
2 COL+
COL–
3
6 Rx+
Rx–
7
AUI
DRIVER
AUI
DRIVER
GND
5
VCC
(+5V)
8
SQE
10MHz GATED
OSCILLATOR
Tx
LOOPBACK
MUX
Rx
RECEIVE SQUELCH
FREQUENCY
LINE
RECEIVER
LMONIN 22
RxIN+ 26
RxIN– 25
RRSET
13
LBDIS
23
LED
DRIVERS
CLSN JAB RCV XMT LMON
1
28
16
15 24
BIAS 27
+5V
1
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