8020中文资料
8020
8020MCC TM 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
MCC is a trademark of SEEQ Technology Inc.
EDLC is a registered trademark of SEEQ Technology Inc.
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 802.3and Ethernet Revision 1.
Pin Configuration
PLASTIC LEADED CHIP CARRIER
TOP VIEW
Figure 1. 8020 MCC Manchester Code Converter
Block Diagram.Functional Block Diagram
R x D
G N D
C O L L –
C O L L +
X 2
9101112132G N D
1M O D E 1
20V C
C 19
T x +
18Tx–17TxD 15TxEN 14
X1
Rx+4Rx–
5CSN 6COLL 7RxC
8
3L P B K /W D T D
16TxC 8020
12345678910
20191817
161514131211
V CC Tx+Tx–MODE 1GND
Rx+Rx–CSN
COLL RxC RxD V SS
TxD TxEN X1X2COLL+COLL–
LPBK/WDTD
TxC TxEN
CSN X1X2RxC RxD
COLL
TRANSMIT
Tx+Tx–RECEIVE
Rx+Rx–
COLL+COLL–
COLLISION
TxC
TxD LPBK/WDTD WATCHDOG TIMER
ENCODER
CARRIER SENSE
DECODER
10MHz DETECTOR
XTAL CLOCK
MUX
V CC V SS MODE 1
DUAL-IN LINE TOP VIEW
Note: Check for latest Data Sheet revision before starting any designs.
SEEQ Data Sheets are now on the Web, at https://www.wendangku.net/doc/7b13399021.html,.
This document is an LSI Logic document. Any reference to SEEQ Technology should be considered LSI Logic.