鈥?/div>
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.
MTD492
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
HIGH PASS
EQUALIZATION
FXI
GND
LOW PASS
FILTER
LOW PASS
FILTER
-
+
CARRIER
SENSE
COM
AUI
DRIVER
RX+
RX-
AUI
DRIVER
CD+
CD-
TX+
TX-
125
10K
XMT
CDS
LOW PASS
FILTER
-
+
WAVEFORM
SHAPING
10MHz CLK
OSC
WATCH DOG
TIMER 26ms
COLLISION
VEE
RECV
TXO
+
-
DC/AC
SQUELCH
VEE
RR+
1K
JABBER RESET X M T S Q
TIMER 0.4sec
REFERENCE
CIRCUIT
RR-
TRANSMIT
STATE
MACHINE
HBE
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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