ML4667 Datasheet, PDF (1/12 Pages) Micro Linear Corporation – Low Power 10BASE-FL Transceiver

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.
BLOCK DIAGRAM
Tx+
10
Tx–
11
4
SQEN/JABD
AUI
RECEIVER
Tx
SQUELCH
1MHz
IDLE
SIGNAL
FEATURES
s Combined with the ML4622 or ML4624, offers a
complete implementation of an 10Base-FL Medium
Attachment Unit (MAU)
s Pin compatible with the ML4662 Transceiver
s Incorporates an AU interface for use in an external
MAU or an internal MAU
s 100mA max LED output current drive
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
+5V
17
12
19
V_CCTx RTSET NC/PEAK
(+5V)
FIBER OPTIC
LED DRIVER
TxOUT
18
JABBER
COL+
2
COL–
3
Rx+
6
Rx–
7
GND
21
AUI
DRIVER
AUI
DRIVER
SQE
10MHz GATED
OSCILLATOR
Tx
LOOPBACK
MUX
Rx
RECEIVE SQUELCH
FREQUENCY
LINE
RECEIVER
LMONIN
22
RxIN+
26
RxIN–
25
V_CC
(+5V)
8
RRSET
13
LBDIS
23
LED
DRIVERS
CLSN JAB RCV XMT LMON
1
28
16
15
24
BIAS ²⁷
+5V
1