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دیتاشیت - LSI Logic - MCC Manchester Code Converter Manual

شماره قطعه DQ8020
شرح مفصل MCC Manchester Code Converter Manual
تولید کننده LSI Logic 
آرم LSI Logic 


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DQ8020 شرح
www.DataSheet4U.com
80820200
MCCTM Manchester
Code Converter
89305
Features
s Compatible with IEEE 802.3 /Ethernet (10BASE5),
IEEE802.3/Cheapernet (10BASE2) and Ethernet
Rev. 1 Specifications
s Compatible with 8003 ELDC®, 8005 Advanced
EDLC
s Manchester Data Encoding/Decoding and
Receiver Clock Recovery with Phase Locked
Loop (PLL)
s Receiver and Collision Squelch Circuit and Noise
Rejection Filter
s Differential TRANSMIT Cable Driver
s Loopback Capability for Diagnostics and
Isolation
s Fail-Safe Watchdog Timer Circuit to Prevent
Continuous Transmission
s 20 MHz Crystal Oscillator
s Transceiver Interface High Voltage (16 V)
Short Circuit Protection
Note: Check for latest Data Sheet revision
before starting any designs.
SEEQ Data Sheets are now on the Web, at
www.lsilogic.com.
This document is an LSI Logic document. Any
reference to SEEQ Technology should be
considered LSI Logic.
s Low Power CMOS Technology with Single 5V
Supply
s 20 pin DIP & PLCC Packages
Description
The SEEQ 8020 Manchester Code Converter chip pro-
vides the Manchester data encoding and decoding func-
tions of the Ethernet Local Area Network physical layer. It
interfaces to the SEEQ 8003 and 8005 Controllers and any
standard Ethernet transceiver as defined by IEEE 802.3
and Ethernet Revision 1.
Functional Block Diagram
TxEN
TxC
TxD
LPBK/
WDTD
CSN
X1
X2
RxC
RxD
COLL
WATCHDOG
TIMER
ENCODER
XTAL
CLOCK
CARRIER
SENSE
DECODER
10MHz
DETECTOR
TRANSMIT
MUX
RECEIVE
COLLISION
Figure 1. 8020 MCC Manchester Code Converter
Block Diagram.
MCC is a trademark of SEEQ Technology Inc.
wwEwD.LDCaistaarSeghiseteeret4d tUra.dceommark of SEEQ Technology Inc.
Pin Configuration
DUAL-IN LINE
TOP VIEW
Tx+
Tx–
VCC
VSS
MODE 1
Rx+
Rx–
MODE 1
GND
1
2
20 V CC
19 Tx+
LPBK/WDTD 3
18 Tx–
Rx+ 4
17 TxD
Rx–
CSN
5
6
8020
16
15
TxC
TxEN
COLL 7
14 X1
RxC 8
13 X2
RxD 9
12 COLL+
VSS 10
11 COLL–
PLASTIC LEADED CHIP CARRIER
TOP VIEW
COLL+
COLL–
3 2 1 20 19
Rx+ 4
Rx– 5
CSN 6
COLL 7
RxC 8
18 Tx–
17 TxD
16 TxC
15 TxEN
14 X1
9 10 11 12 13
MD400023/D
1

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