
80C24
1
MD400119/J
AutoDUPLEX
TM
CMOS Ethernet Interface Adapter
96345
MCC and AutoDUPLEX are trademarks of SEEQ Technology, Inc.
General Description
The SEEQ 80C24 is a CMOS single chip Ethernet serial
interface adapter with a completely ntegrated Manchester
Code Converter (MCC), AUI & 10Base-T transceiver with
wave shaping & filters eliminating the need for external
filters. The 80C24 is designed to interface directly with
SEEQ's family of Ethernet data link controllers- 8003,
80C03, 8005, 80C04, Intel, AMD & National's controllers.
The chip provides automatic polarity correction, automatic
port selection, support for cables longer than 100m, UTP/
STP cable selection, power down mode, separate analog
& digital ground pins & a link disable feature. It also
provides a selectable coded link pulse to implement Au-
toDUPLEX function together with SEEQ's 80C03, 80C04
& NCORE controllers allowing seamless ull duplex opera-
tion in switched network implementations doubling net-
work bandwidth to 20 Mbps in 10Base-T. The 80C24 is
typically suitable for adapter boards, motherboards and
stand-alone TP transceiver designs & switching hubs.
Functional Features
I
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.
I
Meets IEEE 802.3 10Base-5, 10Base-2, 10Base-T
Standards
I
Direct Interface to SEEQ, INTEL, AMD &
NATIONAL LAN Controllers
I
Automatic or Manual Selection of AUI/10Base-T
Interface
I
Provides AutoDUPLEX
TM
Detect Function for
SEEQ LAN Controllers and Doubles Bandwidth
to 20 MBits/sec for Switched Networks
I
Status Indicators: Link, Transmit & Receive,
Port Selection-AUI/TP, TP Cable Polarity
I
Diagnostic Loopback Support
I
Power On Reset with Power Down Mode to
Conserve System Power
I
Separate Analog/Digital Power and Ground Pins
to Minimize Noise
Interface Features
I
Meets IEEE 10Base-T Standards and IEEE 802.3
standards for AUI.
I
On Chip Transmit Wave Shaping and Low Pass
Filter Circuits - No External Filters Required
I
Selectable Termination Impedance to Support
UTP and STP Cables, (100 ohms, 150 ohms)
I
Long Cable Mode Support > 100 Meters
I
Automatic Polarity Correction
I
Link Integrity Test Disable, Selectable Coded
Link Pulse for AutoDUPLEX Mode
I
Low differential and common mode noise on TP
transmit outputs.
I
Differential Transmit Drivers to support 50 Meters
of AUI Cable Lengths.
I
Direct AUI interface to the Manchester Code
Converter.
Note:
Refer to Appendix B for the
Thin Quad Flat Package (TQFP).
Pin Configuration
80C24
TOP VIEW
PLCC
C
4
3
2
1
4
4
4
4
4
5
P
M
A
G
U
A
L
7
8
9
10
11
12
13
14
15
16
17
L
6
T
1
1
2
2
2
2
2
2
2
2
2
39
38
37
36
35
34
33
32
31
30
29
F
SQE_DIS/LPBK/FDPLX
FLTR_DIS
TPO–
TPO+
T
C
X
X
R
R
BIAS_RES
TPI+
TPI–
TXEN
TXD
V
A
M
CI–
CI+
RX–
RX+
TX –
TX +
AUI_TP_LED
LNK_LED
TX_RX_LED
GND
4
V
CC4
V
C
G
3
GND
2
V
CC2
1
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.