MTD492N View Datasheet(PDF) - Myson Century Inc

Part Name

Description

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MTD492N

Coaxial Transceiver Interface

Myson Century Inc 

MYSON

TECHNOLOGY

MTD492

Coaxial Transceiver Interface

FEATURES

• Compatible with IEEE 802.3 10Base5 (Ethernet) and 10Base2 (Cheapernet).

• Internal AUI squelch circuitry for noise rejection.

• Transmission IDL detection at end of packet and dribble bit rejection window.

• Reception dribble bit rejection window.

• Reception and transmission mode collision detection.

• Extended collision detection to turn off receiving path.

• CD heartbeat externally controllable.

• Advanced low-power, high-performance CMOS technology.

• ESD protection greater than 2000 Volts.

• 16-pin PDIP and 28-pin PLCC packages.

GENERAL DESCRIPTION

The MTD492 transceiver integrates the coaxial cable interface functions of the Medium Attachment Unit

(MAU) in Ethernet or Cheapernet LAN applications. In an Ethernet 10Base5 network, MTD492 is mounted

on the thick Ethernet coaxial cable and connects to a station through an AUI cable. For Cheapernet

applications, MTD492 is connected to the Cheapernet coaxial cable through a BNC connector and is

usually mounted on the LAN adapter in a station.

BLOCK DIAGRAM

COAX

FXI

GND

125 XMT

10K

VEE

RECV

CDS

TXO

HIGH PASS

AUI

RX+

EQUALIZATION

COM

DRIVER

RX-

LOW PASS

FILTER

AUI

CD+

LOW PASS

-

CARRIER

DRIVER

+

SENSE

CD-

FILTER

TX+

LOW PASS

FILTER

-

COLLISION

+

WAVEFORM

+

SHAPING

-

TX-

DC/AC

SQUELCH

10MHz CLK WATCH DOG

VEE

OSC

TIMER 26ms

RR+

1K

RR-

REFERENCE

CIRCUIT

TRANSMIT

STATE

MACHINE

HBE

JABBER RESET XMTSQ

TIMER 0.4sec

RECEIVE

STATE

MACHINE

This datasheet contains new product information. Myson Technology reserves the rights to modify the product specification without notice. No

liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

MTD492 Revision 3.5 01/07/1997

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