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80C25 Datasheet

  • 80C25

  • 80C25 AutoDUPLEX CMOS Ethernet Interface Adapter in 28L pack...

  • 30頁

  • ETC

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Full Duplex
AutoDUPLEX
TM
CMOS Ethernet Interface Adapter
in 28L Package
96345
80C25
80C25
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 SEEQ & INTEL Controllers,
See the 80C26 Data Sheet for Direct Interface to
AMD and NSC Controllers
s
Automatic or Manual Selection of AUI/10Base-T
Interface
s
Provides AutoDUPLEX
TM
Detect Function for
SEEQ 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.
s
Differential Transmit Drivers to support 50 Meters
of AUI Cable Lengths.
Pin Configuration
TP/AUI
28
GND
1
FDPLX
26
REXT
DO +
s
Direct AUI interface to the Manchester Code
Converter.
V
CC1
CIS
General Description
25
24
23
27
4
3
2
1
DO 鈥?/div>
CI +
CI 鈥?/div>
DI +
DI 鈥?/div>
5
6
7
8
9
TPO +
TPO 鈥?/div>
TPI +
TPI 鈥?/div>
TXEN
TXD
RXD
28 Pin PLCC
Top View
22
21
20
19
LNK_LED/LNK_DIS
10
FDPLX_DET
11
The SEEQ 80C25 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 80C25 is designed to interface directly with SEEQ and
Intel Ethernet data link controllers. The chip provides
automatic polarity correction, automatic port selection,
separate analog & digital ground pins & a link disable
feature. It also provides a selectable coded link pulse to
implement AutoDUPLEX function together with SEEQ
family of controllers allowing seamless full duplex opera-
tion in switched network implementations doubling net-
work bandwidth to 20 Mbps in 10Base-T. The 80C25 is
typically suitable for adapter boards, motherboards and
stand-alone TP transceiver designs & switching hubs.
V
CC2
15
12
TXC
13
COL
14
GND
2
16
X1
17
CSN
MCC and AutoDUPLEX are trademarks of SEEQ Technology, Inc.
RXC
18
1
MD400142/D

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