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ML4642

Micro Linear
Part Number ML4642
Manufacturer Micro Linear
Description AUI Multiplexer
Published May 7, 2005
Detailed Description April 1997 ML4642 AUI Multiplexer GENERAL DESCRIPTION The ML4642 AUI Multiplexer contains all the necessary drivers/rec...
Datasheet PDF File ML4642 PDF File

ML4642
ML4642

Overview
April 1997 ML4642 AUI Multiplexer GENERAL DESCRIPTION The ML4642 AUI Multiplexer contains all the necessary drivers/receivers and control logic to implement a 2 port MAU when used in conjuction with a transceiver chip which has a standard 802.
3 AUI interface.
In addition, the ML4642 is capable of operating in stand-alone mode where it interconnects two DTEs in the absence of a network MAU.
Several ML4642s can be cascaded together to implement a 4 or 8 port MAU or stand-alone device.
Logic within the ML4642 detects collisions resulting from multiple DTEs transmitting simultaneously.
In addition, collision signals received from a transceiver attached at the MAU port are propagated to both of the DTE ports.
Jabbering DTEs are prevented from loading down the network by internal jabber timers which disable babbling ports.
s FEATURES IEEE 802.
3 compliant AUI interfaces assure compatibility with any AUI ready devices No crystal or clock input On-chip Jabber logic, Collision Detection, and SQE test with enable/disable option Selectable Loopback, Jabber, and SQE Test allows cascading of multiple chips to increase DTE port s s s BLOCK DIAGRAM +5V 61.
9K RRSET VCC VCC CONTROL LOGIC TXIN1P TXIN1N RXOUT1P RXOUT1N CDOUT1P CDOUT1N TXIN2P TXIN2N RXOUT2P RXOUT2N CDOUT2P CDOUT2N LED DRIVERS MAU AUI INTERFACE CI MUX MAU AUI INTERFACE JABBER DO MUX DTE AUI INTERFACE TXOUTP TXOUTN DI MUX RXINP RXINN CDINP CDINN SQE SOURCE GND JAB1/JDIS JAB2 CDLED RXLED/LPBK/SQE TXLED1 TXLED2 1 ML4642 PIN CONNECTIONS ML4642 28-Pin SSOP (R28) RXLED/LPBK/SQE RXINP RXINN JAB1/JDIS RRSET VCC TXOUTP TXOUTN TXLED1 TXLED2 TXIN2P TXIN2N TXIN1P TXIN1N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 RXOUT1P RXOUT1N RXOUT2N RXOUT2P GND CDOUT1N CDOUT1P JAB2 CDINP CDINN CDLED CDOUT2P CDOUT2N VCC TOP VIEW ML4642 28-Pin PLCC (Q28) RXLED/LPBK/SQE RXOUT1N 27 4 RRSET VCC TXOUTP TXOUTN TXLED1 TXLED2 TXIN2P 5 6 7 8 9 10 11 12 3 2 1 28 26 25 24 23 RXOUT2N RXOUT1P JA...


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