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ST70138

UNICORN II™ USB CONTROLLERLESS ADSL DMT TRANCEIVER

STMicroelectronics 

ST70138

UNICORN II™ USB

CONTROLLERLESS ADSL DMT TRANCEIVER

DATA BRIEF

4 HARDWARE FEATURES

■ SUPPORT DIGITAL SIGNAL PROCESSING

REQUIREMENTS FOR ONE ADSL CPE

CHANNEL (ITU-R)

■ COMPLIANT WITH ITU 992.1 (ADSL FULL

RATE) ANNEX A (ADSL OVER POTS),

ANNEX B (ADSL OVER ISDN), ITU 922.2

(G.LITE) AND ANSI T1.413.

■ ENHANCED FTP TRANSFER CAPABILTIES

■ DIRECT INTERFACE TO USB (USB RELEASE

1.1 SPECIFICATION)

■ DIRECT INTERFACE TO EXTERNAL 8/16bit

SERIAL MEMORY TO SUPPORT USB

USER'S CONFIGURATION.

■ DIRECT ANALOG FRONT END INTERFACE

FOR MTC20174

■ CLOCK & RESET INTERFACE

■ 1.8V AND 3.3V POWER SUPPLY

■ TTL LOGIC LEVELS COMPATIBLE

■ POWER MANAGEMENT CAPABILITIES

■ LOW POWER CONSUMPTION : MAX 0.45W

■ TQFP144 (ORDER CODE ST70138T -

BACKWARD COMPATIBLE WITH PREVIOUS

ST70137)

■ LFBGA80 (ORDER CODE ST70138B)

5 DESCRIPTION

Unicorn II is an evolution of the field-proven and

mass deployed Unicorn modem that dramatically

lowers the overall system cost when designing

and producing a USB ADSL modem. The Unicorn

II chipset is designed using cost effective CMOS

technology, further integrating external compo-

nents which leads to even lower E-BOM costs, re-

duced component count and lower PCB

complexity; All of this while increasing overall per-

formance. Its proven controller-less and SDRAM-

less architecture is highly competitive and well

suited in today's cost focused modem market.

The Unicorn II chipset is designed to simplify the

development of low-cost ADSL CPE modems for

Windows, Mac and Linux based environments and

enables manufacturers to achieve a very compet-

itive production cost. Due to its controller-less ar-

chitecture and particularly the advantage that it

does not require an external SDRAM in its E-BOM,

the total cost of the external components needed

Figure 2. Packages

TQFP144

Table 1. Order Codes

Part Number

ST70138T

ST70138B

LFBGA80

Package

TQFP144

LFBGA80

in the modem is the best in its class. With a low

component count of less then 140 external compo-

nents and small form factor packages, the Unicorn

II easily fits on a standard 2 layer single sided PCB

with small dimensions which is contributes signifi-

cantly to further lowering overall system costs. To-

gether with its low power consumption, high-

speed performance up to 8 Mbps and customiz-

able complete software driver packages, the Uni-

corn II is the ideal choice for USB based ADSL

modems.

The ST70138T/B is the ADSL DMT transceiver

chip of the UNICORN2™ Chipset.

ST70138T in intended to be used as a pin-to-pin

replacement part of the ST70137 device in order

to get advantage from its better cost-structure and

its enhanced FTP transfer capabilities. ST70138T

is packaged in a TQ144 package. Full backward

compatibility with already existing USB PCB de-

signs is assured.

ST70138B, packaged in LFBGA80 is intended for

new PCB designs, which will benefit from exten-

sive E-BOM reduction in the reference design,

mass production friendly EEPROM programma-

tion, enhanced FTP throughput and overall lower

system cost structures.

Eleven years of experience have enabled ST to de-

velop a chipset that offers full compatibility with all

current full-rate and G.lite ADSL standards, USB

standards including plug-and-play support. The Uni-

corn II chipset has a comprehensive driver suite that

supports Windows operating systems from 98 to XP,

Mac operating systems 8 to X and Linux. The Unicorn

is fully interoperable with all major DSLAMs and is

compliant to TR-048 (DSLforum) and ETSI 101 388

performance requirements.

September 2004

3/6

This is preliminary information on a new product foreseen to be developed. Details are subject to change without notice.

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