CS8904
Crystal LAN™ Quad Ethernet Transceiver
The CS8904 incorporates four independent
Manchester encoder/decoders (ENDEC), clock
recovery circuits, 10BASE-T transceivers, and link
status LED circuits. The 10BASE-T transceivers
include drivers, receivers, and high-performance
on-chip analog filters, allowing direct connections
to low-cost isolation transformers. The CS8904’s
superior EMI characteristics are a result of the
high-quality receive and transmit filters which
1.0 INTRODUCTION
1.1 General Description
The CS8904 is a true single-chip quad Ethernet
interface solution, incorporating all analog and
digital circuitry needed for a complete Ethernet
front end circuit. It includes high-performance on-
chip filtering, eliminating the need for external
filters. In addition, the CS8904 supports the latest
IEEE Ethernet features including full duplex and eliminate the need for external filter packs and help
Auto-Negotiation.
to make FCC Part 15, Class B compliance easier to
achieve. Each of the four transceivers support half
and full duplex operation and include IEEE-
compliant Auto-Negotiation capability.
20 MHz
XTAL
CS8904
RJ-45
RJ-45
RJ-45
RJ-45
10BASE-T
LINKLED
10BASE-T
LINKLED
S
W
I
T
C
H
I
SYSTEM
ASIC
N
G
10BASE-T
LINKLED
B
U
S
10BASE-T
LINKLED
Figure 1. Ethernet Switching Hub Application of CS8904
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