March 1997
ML4667
Low Power 10BASE-FL Transceiver
GENERAL DESCRIPTION
The ML4667 is a low power high output current pin
compatible version of the industry standard ML4662. The
ML4667 10Base-FL transceiver combined with either the
ML4622 or ML4624 fiber optic quantizer provide all
functionality required to implement both an internal and
external IEEE 802.3 10Base-FL MAU interface that allows
it to be directly connected to industry standard
manchester encoder/decoder chips or and AUI cable.
The ML4667 provides a highly integrated solution that
requires a minimal number of external components. The
ML4667 is compliant to the IEEE 802.3 10Base-FL
standard. The transmitter offers a 100mA maximum
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.
The receiver accepts and ECL level input from the
ML4622 or ML4624 fiber optic quantizer. 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.
FEATURES
s
Combined with the ML4622 or ML4624, offers a
complete implementation of an 10Base-FL Medium
Attachment Unit (MAU)
Pin compatible with the ML4662 Transceiver
Incorporates an AU interface for use in an external
MAU or an internal MAU
100mA max LED output current drive
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
s
s
s
s
s
s
s
BLOCK DIAGRAM
4
17
12
+5V
19
SQEN/JABD
10
11
Tx+
Tx–
AUI
RECEIVER
V
CC
Tx
(+5V)
RTSET
NC/PEAK
TxOUT
FIBER OPTIC
LED DRIVER
18
Tx
SQUELCH
1MHz
IDLE
SIGNAL
JABBER
LMON
IN
SQE
COL+
COL–
AUI
DRIVER
10MHz GATED
OSCILLATOR
RECEIVE SQUELCH
FREQUENCY
RxIN+
RxIN–
22
2
3
LINE
RECEIVER
Tx
Rx
LED
DRIVERS
26
25
6
7
Rx+
Rx–
AUI
DRIVER
LOOPBACK
MUX
GND
21
V
CC
(+5V)
8
RRSET
13
LBDIS
23
1
CLSN
28
JAB
RCV
16
XMT
15
LMON
24
BIAS
27
+5V
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
