July 2000
ML2652/ML2653
10Base-T Physical Interface Chip
GENERAL DESCRIPTION
The ML2652, 10BASE-T Physical Interface Chip, is a
complete physical interface for twisted pair and AUI
Ethernet applications. It combines a 10BASE-T MAU,
Manchester Encoder/Decoder, and Twisted Pair Interface
filters in one monolithic IC. A complete DTE interface for
twisted pair Ethernet can be implemented by combining
the ML2652, an Ethernet controller, and transformers.
The ML2652 can automatically select between an AUI and
twisted pair interface based on Link Pulses. Six LED
outputs provide complete status at the physical link. Link
pulse testing can be enabled or disabled through the
LTP
LED Pin.
The unique transmitter design uses a waveform generator
and low pass filter to meet the 10BASE-T transmitter
requirements without the need for an external filter. The
differential current driven output reduces common mode
which in turn results in very low EMI and RFI noise.
The ML2652 and ML2653 (28 pin version) are implemented
in a low power double polysilicon CMOS technology. The
ML2653 does not include the AUI interface.
FEATURES
s
s
s
s
s
s
Complete physical interface solution
Conforms to IEEE 802.3i–1990 (10Base-T)
On-chip transmit and receive filters
Automatic AUI/Twisted Pair selection (ML2652 only)
Power down mode
Pin selectable controller interface-(CS0 – CS2)
Intel 82586, 82596
NSC DP8390
Seeq 8003, 8005
AMD 7990
Automatic polarity correction
Pin selectable receive squelch levels
Status pins for: link detect, receive &
transmit activity, collision, jabber, AUI selection
Single supply 5V ±5%
s
s
s
s
ML2652 BLOCK DIAGRAM
CS0 CS1 CS2 FD V
CC
V
CC
GND
TxC
TxE
TxD
DATA MANCHESTER
ENCODER
ENABLE
COL
LPBK
RxC
RxE
RxD
CLK
ENABLE
CONTROLLER
INTERFACE
COLLISION
GND
JABDIS
JABBER
DETECT
LINK
PULSE
XMT
WAVEFORM
GEN & LPF
COLLISION
DETECT
RECEIVE
LPF
RECEIVER
RSL
DO+
DO–
AUI
CI+
CI–
DI+
DI–
CURRENT
DRIVEN XMT
OUTPUT
DRIVER
RTX
Tx+
Tx–
Rx+
Rx–
DATA MANCHESTER
DECODER
OSC
LEDS
RPOL
AUISEL
XMT
CLS
RCV
LTP
JAB
AUI/TP
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
