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DP83910A Datasheet

  • DP83910A

  • CMOS SNI Serial Network Interface

  • 12頁

  • NSC

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DP83910A CMOS SNI Serial Network Interface
May 1995
DP83910A CMOS SNI
Serial Network Interface
General Description
The DP83910A CMOS Serial Network Interface (SNI) is a
direct-pin equivalent of the bipolar DP8391 SNI and pro-
vides the Manchester data encoding and decoding func-
tions for IEEE 802 3 Ethernet Thin-Ethernet type local area
networks The SNI interfaces the DP8390 Network Interface
Controller (NIC) to the DP8392 CTI or an Ethernet transceiv-
er cable When transmitting the SNI converts non-return-to-
zero (NRZ) data from the controller into Manchester data
and sends the converted data differentially to the transceiv-
er Conversely when receiving a Phase Lock Loop de-
codes the 10 Mbit s data from the transceiver into NRZ
data for the controller
The DP83910A operates in conjunction with the DP8392
Coaxial Transceiver Interface (CTI) and the DP8390 Net-
work Interface Controller (NIC) to form a three-chip set that
implements a complete IEEE 802 3 compatible network as
shown below The DP83910A is a functionally complete
Manchester encoder decoder including a balanced driver
and receiver on-board crystal oscillator collision signal
translator and a diagnostic loopback feature The
DP83910A fabricated CMOS typically consumes less than
70 mA of current However as a result of being CMOS the
DP83910A鈥檚 differential signals must be isolated in both
Ethernet and thin wire Ethernet
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Compatible with Ethernet I IEEE 802 3 10BASE5
10BASE2 and 10BASE-T
Designed to interface with 10BASE-T transceivers
Functional and pin-out duplicate of the DP8391
10 Mbits s Manchester encoding decoding with receive
clock recovery
Requires no precision components
Loopback capability for diagnostics
Externally selectable half or full step modes of opera-
tion at transmit output
Squelch circuitry at the receive and collision inputs to
reject noise
TTL MOS compatible controller interface
1 0 System Diagram
IEEE 802 3 Compatible Ethernet Thin-Ethernet 10 BaseT
Local Area Network Chip Set
TL F 9365 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 9365
RRD-B30M105 Printed in U S A

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