ML2652 Datasheet, PDF (1/23 Pages) Micro Linear Corporation – 10Base-T Physical Interface Chip

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.
ML2652 BLOCK DIAGRAM
FEATURES
s Complete physical interface solution
s Conforms to IEEE 802.3i–1990 (10Base-T)
s On-chip transmit and receive filters
s Automatic AUI/Twisted Pair selection (ML2652 only)
s Power down mode
s Pin selectable controller interface-(CS0 – CS2)
Intel 82586, 82596
NSC DP8390
Seeq 8003, 8005
AMD 7990
s Automatic polarity correction
s Pin selectable receive squelch levels
s Status pins for: link detect, receive &
transmit activity, collision, jabber, AUI selection
s Single supply 5V ±5%
CS0 CS1 CS2 FD VCC VCC GND
GND
TxC
TxE
DATA MANCHESTER
ENCODER
TxD
ENABLE
COL
LPBK
RxC
RxE
RxD
CONTROLLER COLLISION
INTERFACE
DATA _MANCHESTER
DECODER
ENABLE
CLK
OSC
LEDS
JABDIS
JABBER
DETECT
LINK
PULSE
RTX
XMT
WAVEFORM
GEN & LPF
COLLISION
DETECT
RECEIVER
CURRENT
DRIVEN XMT
OUTPUT
DRIVER
RECEIVE
LPF
AUI
Tx+
Tx–
Rx+
Rx–
RSL
DO+
DO–
CI+
CI–
DI+
DI–
RPOL
AUISEL XMT CLS
RCV
LTP
JAB
AUI/TP
1