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8023A

MCC

TM

Manchester

Code Converter

92123

Features

s

Compatible with IEEE 802.3 /Ethernet (10BASE5),

IEEE802.3/CHEAPERNET (10BASE2) and Ethernet

Rev. 1 Specifications

s

Compatible with 8003 ELDC

廬

, 8005 Advanced

EDLC and Intel 82586 LAN Controller

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

s

Low Power CMOS Technology with Single 5V

Supply

s

20 pin DIP (Commercial) &

20 pin PLCC Packages (Commercial, Extended)

s

Temperature Ranges,

鈥?Commercial 0

擄

C to +70

擄

C

鈥?Extended 鈥?0

擄

C to +85

擄

C

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.

Description

The SEEQ 8023A 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 Ethernet Data Link

Controllers or to the Intel 82586 LAN Controller and any

standard Ethernet transceiver as defined by IEEE 802.3

and Ethernet Revision 1.

Pin Configuration

DUAL-IN-LINE

TOP VIEW

(Commercial Temp Only)

MODE 1

MODE 2

LPBK/WDTD

Rx+

1

2

3

4

5

6

7

8

9

10

20

19

18

17

V CC

Tx+

Tx鈥?/div>

TxD

TxC

TxEN (TxEN)

X1

X2

COLL+

COLL鈥?/div>

Functional Block Diagram

TxEN

WATCHDOG

TIMER

Rx鈥?/div>

(CSN) CSN

(COLL) COLL

(RxC) RxC

RxD

VSS

8023A

16

15

14

13

12

11

TxC

ENCODER

TxD

LPBK/

WDTD

CSN

X1

X2

RxC

RxD

DECODER

MUX

XTAL

CLOCK

CARRIER

SENSE

TRANSMIT

Tx+

Tx鈥?/div>

VCC

VSS

MODE 1

MODE 2

RECEIVE

Rx+

Rx鈥?/div>

PLASTIC LEADED CHIP CARRIER

TOP VIEW

(Commercial and Extended Temps)

LPBK/WDTD

MODE 2

MODE 1

V

CC

3

2

1

20

19

COLL

10MHz

DETECTOR

COLLISION

COLL+

COLL鈥?/div>

Rx+

Rx鈥?/div>

(CSN) CSN

(COLL) COLL

(RxC) RxC

4

5

6

7

8

9

RxD

Tx+

18 Tx鈥?/div>

17 TxD

16 TxC

15 TxEN (TxEN)

14

10

GND

Figure 1. 8023A MCC Manchester Code Converter

Block Diagram.

MCC is a trademark of SEEQ Technology, Inc.

EDLC is a registered trademark of SEEQ Technology, Inc.

X1

11

COLL鈥?/div>

12

COLL+

13

X2

1

MD400022/D

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