ML4667CQ Micro Linear, ML4667CQ Datasheet

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ML4667CQ

Manufacturer Part Number
ML4667CQ
Description
Low power 10BASE-FL transceiver
Manufacturer
Micro Linear
Datasheet
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
10
11
2
3
6
7
Tx+
Tx–
COL+
COL–
Rx+
Rx–
GND
21
SQUELCH
RECEIVER
DRIVER
DRIVER
(+5V)
AUI
AUI
AUI
V
Tx
CC
8
RRSET
Low Power 10BASE-FL Transceiver
13
4
+5V
SQEN/JABD
10MHz GATED
OSCILLATOR
LOOPBACK
SIGNAL
1MHz
MUX
IDLE
SQE
23
LBDIS
Tx
Rx
FEATURES
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
1
FIBER OPTIC
LED DRIVER
17
CLSN
V
JABBER
(+5V)
CC
Tx
28
JAB
DRIVERS
12
RECEIVE SQUELCH
RTSET
+5V
LED
FREQUENCY
16
RECEIVER
RCV
LINE
19
15
NC/PEAK
XMT
24
LMON
LMON
TxOUT
RxIN+
RxIN–
BIAS
IN
18
22
26
25
27
ML4667
March 1997
1

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ML4667CQ Summary of contents

Page 1

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 ...

Page 2

ML4667 PIN CONNECTION 2 ML4667 28-Pin PLCC (Q28 NC/GND Rx Rx– Tx Tx– ...

Page 3

PIN DESCRIPTION PIN NAME FUNCTION CLSN 1 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, ...

Page 4

ML4667 ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Power Supply Voltage Range V ..................................................... GND –0.3 ...

Page 5

AC ELECTRICAL CHARACTERISTICS SYMBOL TRANSMIT F Transmit Idle Frequency TXIDF P Transmit Idle Duty Cycle TXDC t Transmit Turn-On Pulse Width TXNPW t Transmit Turn-On Delay TXODY t Transmit loopback Start up Delay TXLP t Transmit Turn Off Pulse Width ...

Page 6

ML4667 6 Figure 1. ML4667 Schematic Diagram ...

Page 7

SYSTEM DESCRIPTION Figure 1 shows a schematic diagram of the ML4667 in an internal or external 10Base-FL MAU. On one side of the transceiver is the AU interface and on the other is the fiber optic interface. The AU interface ...

Page 8

ML4667 V CC RTSET = 560 OUT TxOUT Figure 3. Converting Optical LED Driver Output to Differential ECL. If not driving an optical LED directly, a differential output can be generated by tying ...

Page 9

TIMING DIAGRAMS t TXNPW Tx+ VALID Tx– t TXODY TxOUT IDLE t TXLP Rx+ Rx– RxIN+ RxIN– Rx+ Rx– Tx+ Tx– RxIN+ RxIN– t COL+ COL– Rx+ Tx Rx– RxIN+ RxIN– Tx+ Tx– t COL+ COL– DATA t t TXSDY ...

Page 10

ML4667 TIMING DIAGRAMS RxIN+ RxIN– Tx+ VALID Tx– t SQEXR COL+ CS0 COL– Rx Rx– Tx+ Tx– RxIN+ VALID RxIN– COL+ CS0 COL– Rx+ RxIN Rx– COL+ COL– TxOUT COL+ COL– 10 DATA Figure 8. ...

Page 11

TIMING DIAGRAMS Tx+ Tx – TxOUT COL+ COL– Tx+ Tx– Typ. 150ns XMT RxIN+ RxIN– RCV RxIN+ RxIN– LMON IN LMON VALID DATA t t JAD JRT VALID DATA t JSQE CS0 Figure 12. Jabber Timing t LED Figure 13. ...

Page 12

... ORDERING INFORMATION PART NUMBER ML4667CQ © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376; Japan: 2598946. Other patents are pending. ...

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