YTD428 データシートの表示（PDF） - Yamaha Corporation

部品番号

コンポーネント説明

メーカー

YTD428

IDSU ISDN DSU for Terminal Equipment

Yamaha Corporation 

BLOCK DIAGRAM

-5-

2.2 DSU Configuration Example

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.

s Configuration example of a general DSU

Various functions are incorporated on a single chip allowing the user to create a low power-consuming

product at a low cost.

Layer 3 info.

Bch data

T ref. pt.

YM7405 or

YTD410

for S/T ref. pt.

included driver/receiver

for S/T ref. pt.

RA / RB

TA / TB

YTD428

U ref. pt. driver

Call control

circuit

DSU

L1

L2

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