YTD428 YAMAHA [YAMAHA CORPORATION], YTD428 Datasheet - Page 4

• Manufacturer Part Number: YTD428
• Description: DSU LSI for the ISDN Terminal Equipment
• Manufacturer: YAMAHA [YAMAHA CORPORATION]

YTD428 incorporates the circuit termination, line termination, T reference point interface and U
reference point interface functions on a single chip allowing the user to easily configure a DSU that
consumes small amount of power at a minimal cost. The user can select from the two types of
configurations. One is the general configuration in which a transformer is used at the T reference
point interface. The other is a configuration in which a TTL interface is used to directly connect to
the T reference point LSI.
Various functions are incorporated on a single chip allowing the user to create a low power-consuming
product at a low cost.
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Configuration example of a general DSU
DSU Configuration Example
included driver/receiver
for S/T ref. pt.
YM7405 or
Layer 3 info.
for S/T ref. pt.
Bch data
YTD410
T ref. pt.
RA / RB
TA / TB
Call control
YTD428
circuit
U ref. pt. driver
DSU
L1
L2