KS8737 Product Brief
Revision 1.0
10/100 LV PHY FX
Operating at 3.3 Volts to meet low voltage and low
power requirement, the KS8737 is a 10/100BaseTX/FX
Physical Layer Transceiver which provides MII interface
for transmit and receive data. It contains the 100BaseTX/
FX Physical Medium Attachment (PMA), Physical
Medium Dependent (PMD), and Physical Coding Sub-
layer (PCS) functions. Moreover, the KS8737 has an on-
chip 10BaseT encoder/decoder and output filtering, which
eliminates the need for external filters and allows a single
set of line magnetics to be used to meet the
requirements for both 100BaseTX and 10BaseT.
The KS8737 can automatically configure itself for
100 or 10 Mbps and full or half duplex operation, using
the on-chip Auto-Negotiation algorithm. It’s an ideal
physical layer transceiver choice for 100BaseTX
100BaseFX/10BaseT applications.
Features
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Single chip 100BaseTX/100BaseFX/10BaseT physical
layer solution
3.3V CMOS design, 70mA operating current
(excluding Transmit output driver current)
Fully compliant to IEEE 802.3u standard
Supports Media Independent Interface (MII) mode
Supports 10BaseT, 100BaseTX and 100Base-FX fiber
channel with Far_End_Fault Detection
Supports power down and power saving modes
Configurable through MII serial management ports or
via external control pins
Supports auto-negotiation and manual selection for
10Mbps or 100Mbps speeds
Supports auto-negotiation and manual selection for full-
and half-duplex modes
Standard CSMA/CD or full duplex operation at 10Mbps
or 100Mbps
On-chip built-in filtering for both 100BaseTX and
10BaseT
LED outputs for link, activity, full/half duplex, collision
and speed
Available in 64-pin TQFP surface mount package
(10 mm
×
10 mm
×
1.0 mm)
Block Diagram
TXP
TXM
Transmitter
10/100
Pulse
Shaper
NRZ/NRZI
MLT3 Encoder
4B/5B Encoder
Scrambler
Parallel/Serial
Parallel/Serial
Manchester Encoder
Adaptive EQ
Base Line
Wander Correction
MLT3 Decoder
NRZI/NRZ
MII
Registers
and
Controller
Interface
TXD3
TXD2
TXD1
TXD0
TXER
TXC
TXEN
CRS
COL
MDIO
MDC
RXD3
RXD2
RXD1
RXD0
RXER
RXDV
RXC
FXMODEB
LINK
ACT
COL
FDX
SPD
RXP
RXM
Clock
Recovery
4B/5B Decoder
Descrambler
Serial/Parallel
Auto
Negotiation
10BaseT
Receiver
FIBIP
FIBIM
X1
X2
Power
Down or
Saving
PLL
PWRDWN
PWRSAVE
Manchester Decoder
Serial/Parallel
LED
Driver
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
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MICREL [ MICREL SEMICONDUCTOR ]
