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ST20138

Unicorn II

September 2004

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

1

DESCRIPTION

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

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 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 and PCI based

ADSL modems.

The Unicorn II chipset consists of the digital

ST70138 chip and the MTC20174 analog front

end.

The ST70138 is supplied in two packages,

TQFP144 and LBGA80. The ST70138T packaged

in TQ144 is a pin-to-pin compatible version of the

ST70137 enabling manufacturers to benefit direct-

ly from the cost and performance advantages that

the ST70138 brings.

The TQ144 flavor brings out both the USB and PCI

interfaces. Supplied in a compact USB-only

LBGA80 package, the ST70138B brings addition-

al cost advantages to new designs.

The MTC20174 Analog Front End (AFE) with inte-

grated line driver is designed for DMT based

ADSL CPE modems compliant with ANSI T1.413

issue 2, ITU G.992.1 (G.dmt) and ITU G.992.2

(G.lite), for Annex A, B and C.

DATA BRIEF

PCI/USB ADSL CHIPSET: ST70138 + MTC20174

FOR ULTRA LOW COST ADSL MODEM

Figure 1. Chipset Architecture Overview

ST70138

DMT/ATM

MTC20174

AFE

Line Interface

Phone Line

PC/Mac

USB

PCI

EEPROM

(0-16KB)

Optional

Rev. 1