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ML4658 Datasheet, PDF (1/17 Pages) Micro Linear Corporation – 10BASE-T Transceiver | |||
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GENERAL DESCRIPTION
The ML4658 10BASE-T Transceiver is a single chip cable
line driver/receiver that provides all of the functionality
required to implement both an internal and external IEEE
802.3 10BASE-T MAU. This part offers a standard IEEE
802.3 AU interface that allows it to directly connect to
industry standard manchester encoder/decoder chips or to
an AUI cable.
The ML4658 requires a minimal number of external
components, and is compliant to the IEEE 802.3 10BASE-T
standard. The differential current driven transmitter offers
superior performance because of its highly symetrical
switching. This results in low RFI noise and low jitter.
The Transceiver easily interfaces to 100⦠unshielded
twisted pair cable, 150⦠shielded twisted pair cable, or a
range of other characteristic impedances by simply
changing one external resistor. Jabber, Link Test, and SQE
Test are fully integrated onto the chip with enable/disable
options. A polarity detection status pin, which can drive
an LED, is provided for receive data, and the ML4658
offers automatic polarity correction.
November 1998
ML4658
10BASE-T Transceiver
FEATURES
s Complete implementation of IEEE 802.3 10BASE-T
Medium Attachment Unit (MAU)
s Incorporates an AU interface for use in an external
MAU or internal MAU
s Single 5V supply ±10%
s No crystal or clock input
s Current Driven Output for low RFI noise and low jitter
s Capable of driving 100⦠unshielded twisted pair cable
or 150⦠shielded twisted pair cable
s Polarity detect status pin capable of driving an LED
s Automatic Polarity Correction
s On-chip Jabber logic, Link Test, and SQE test with
enable/disable option
s Provides six network status LED ouput pins
BLOCK DIAGRAM
Tx+
Txâ
COL+
COLâ
Rx+
Rxâ
AUI
RECEIVER
TRANSMIT
SQUELCH
SQEN/LTD/JABD
SQE
AUI
DRIVER
AUI
DRIVER
10MHz GATED
OSCILLATOR
Tx
LOOPBACK
MUX
Rx
GND VCC (5V)
RRSET
5V
5V
RTSET
LINK PULSE
PRE-EQUALIZED
TRANSMIT DRIVER
JABBER
RECEIVE
SQUELCH
LINE
RECEIVER
TxTP+
TxTPâ
RxTP+
RxTPâ
LINK TEST
RECEIVE LOGIC
AUTOMATIC
POLARITY
CORRECTION
BIAS
LED DRIVERS
CLSN JAB RCV XMT LTF POLRD
TxCAP0
TxCAP1
1
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