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80C26 Datasheet

  • 80C26

  • 80C26 10 Mb Full Duplex Interface Adapter manual 12/96

  • 29頁

  • ETC

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Full Duplex
80C26
80C26
96346
CMOS Ethernet
Interface Adapter in 28L Package
Functional Features
s
Low Power CMOS Technology Ethernet Serial
Interface Adapter with Integrated Manchester
Code Converter (MCC
TM
), AUI and 10Base-T
Transceiver with Output Wave Shaping and on
chip filters.
s
Meets IEEE 802.3 10Base-5, 10Base-2, 10Base-T
Standards
s
Direct Interface to NSC & AMD Controllers,
See the 80C25 Data Sheet for Direct Interface to
SEEQ and Intel Controllers
s
Automatic or Manual Selection of AUI/10Base-T
Interface
s
Provides AutoDUPLEX
TM
Detect Function for Full
Duplex LAN Controllers, Doubling Bandwidth
to 20 MBits/sec for Switched Networks
s
Separate Analog/Digital Power and Ground Pins
to Minimize Noise
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.
Interface Features
s
Meets IEEE 10Base-T Standards and IEEE 802.3
standards for AUI.
s
On Chip Transmit Wave Shaping and Low Pass
Filter Circuits - No External Filters Required
s
Link Integrity Test Disable, Selectable Coded
Link Pulse for AutoDUPLEX Mode
s
Automatic Polarity Correction
s
Low differential and common mode noise on TP
transmit outputs.
Pin Configuration
TP/AUI
FDPLX
28
GND
1
26
REXT
s
Differential Transmit Drivers to support 50 Meters
of AUI Cable Lengths.
s
Direct AUI interface to the Manchester Code
Converter.
V
CC1
CIS
DO +
27
4
3
2
1
DO 鈥?/div>
CI +
CI 鈥?/div>
DI +
DI 鈥?/div>
5
6
7
8
9
25
24
23
TPO +
TPO 鈥?/div>
TPI +
TPI 鈥?/div>
TXEN
TXD
RXD
General Description
The SEEQ 80C26 is a CMOS single chip Ethernet serial
interface adapter with a integrated Manchester Code
Converter (MCC), AUI & 10Base-T transceiver with wave
shaping & filters eliminating the need for external filters.
The 80C26 is designed to interface directly with National
and AMD Ethernet controllers. The chip provides auto-
matic polarity correction, automatic port selection, sepa-
rate analog & digital ground pins & a link disable feature.
It also provides a selectable coded link pulse to implement
AutoDUPLEX function together with a Full Duplex control-
ler allowing seamless full duplex operation in switched
network implementations doubling network bandwidth to
20 Mbps in 10Base-T. The 80C26 is typically suitable for
adapter boards, motherboards and stand-alone TP trans-
ceiver designs & switching hubs.
28 Pin PLCC
Top View
22
21
20
19
LNK_LED/LNK_DIS
10
FDPLX_DET
11
15
12
16
TXC
13
X1
17
CSN
COL
14
MCC and AutoDUPLEX are trademarks of SEEQ Technology, Inc.
GND
2
V
CC2
RXC
18
1
MD400143/D

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