ST20138
Unicorn II
PCI/USB ADSL CHIPSET: ST70138 + MTC20174
FOR ULTRA LOW COST ADSL MODEM
DATA BRIEF
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.
Figure 1. Chipset Architecture Overview
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.
ST70138
DMT/ATM
MTC20174
AFE
Line Interface
USB
PCI
Phone Line
PC/Mac
EEPROM
(0-16KB)
Optional
September 2004
This is preliminary information on a new product foreseen to be developed. Details are subject to change without notice.
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