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Электронный компонент: YTD428-S

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YTD428 APPLICATION MANUAL
CATALOG No.: LSI-6TD428A3
2002.12





YTD428
APPLICATION MANUAL
IDSU
ISDN DSU for Terminal Equipment
Yamaha reserves the right to make changes to its Products and to this document
without notice. The information contained in this document has been carefully checked
and is believed to be reliable. However, Yamaha assumes no responsibilities for
inaccuracies and makes no commitment to update or to keep current the information
contained in this document.
These Yamaha Products are designed only for commercial and normal industrial
applications, and are not suitable for other uses, such as medical life support
equipment, nuclear facilities, critical care equipment or any other application the failure
of which could lead to death, personal injury or environmental or property damage. Use
of the Products in any such application is at the customer's sole risk and expense.
Yamaha assumes no liability for incidental , consequential, or special damages or injury
that may result from misapplication or improper use or operation of the Products.
Yamaha makes no warranty or representation that the Products are subject to
intellectual property license from Yamaha or any third party, and Yamaha makes no
warranty excludes any liability to the Customer or any third party arising from or related
to the Products' infringement of any third party's intellectual property rights, including
the patent, copyright, trademark or trade secret rights of any third party.
Examples of use described herein are merely to indicate the characteristics and
performance of Yamaha products. Yamaha assumes no responsibility for any intellectual
property claims or other problems that may result from applications based on the
examples described herein. Yamaha makes no warranty with respect to the products,
express or implied, including, but not limited to the warranties of merchantability, fitness
for a particular use and title.
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IMPORTANT NOTICE
The specifications of this product are subject to improvement changes without prior notice.
CONTENTS
- 1 -
Contents
1. INTRODUCTION ..................................................................................... 2
1.1 Features ................................................................................................................................ 3
2. BLOCK DIAGRAM .................................................................................. 4
2.1 Internal Block Diagram .......................................................................................................... 4
2.2 DSU Configuration Example ................................................................................................. 5
3. PIN DESCRIPTIONS .............................................................................. 7
3.1 Pin Assignments .................................................................................................................... 7
3.2 Pin Functions ........................................................................................................................ 8
4. DETAILS OF FUNCTIONS.................................................................... 13
4.1 U Reference Point Section .................................................................................................. 13
4.2 Circuit Termination / Line Termination Section .................................................................... 13
4.3 Interface Switch Section ...................................................................................................... 14
4.4 T Reference Interface Section ............................................................................................ 15
5. ELECTRICAL CHARACTERISTICS ..................................................... 16
5.1 Absolute Maximum Ratings ................................................................................................. 16
5.2 Recommended Operating Conditions ................................................................................. 16
5.3 DC Characteristics .............................................................................................................. 17
5.4 AC Characteristics ............................................................................................................... 18
6. PIN DESCRIPTIONS ............................................................................ 22
REFERENCE CIRCUIT ............................................................................ 23
- 2 -
INTRODUCTION
1. INTRODUCTION
YTD428 is a LSI which provides the ISDN subscriber interface (two-wire time compression
multiplexing operation) and the NT side of the ISDN Basic Rate user-network interface function
(digital four-wire time-division full-duplex operation). It is capable of providing the electric
characteristics conforming to TTC Standard JT-I430 and JT-G961.
YTD428 incorporates the circuit termination and line termination functions on a single chip
allowing the user to easily configure a DSU (Digital Service Unit) that consumes small amount of
power at a minimal cost.
In addition, a TTL interface is provided at the T reference point (layer 1 level). This feature is
especially effective when combined with YAMAHA's ISDN LSI for S/T reference point interface,
YTD423 or YTD418. It allows considerable cost reduction on parts around the pulse transformer
when constructing a device with a built-in DSU.
The driver/receiver section of the T reference point interface can be separated from the DSU section
and be used independently. The user can enable or disable this feature as necessary.
INTRODUCTION
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1.1 Features
s
Circuit Termination Section
s
Conforms to TTC Standard JT-I430 and JT-G961
q
Digital four-wire time-division full-duplex operation
q
Two-wire time compression multiplexing operation
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Transmission rate at U reference point: 320 kbit/s, at T reference point: 192 kbit/s
q
Frame assembling and disassembling function
q
State transition control
q
Loopback function
q
T reference point timing control
(switch between short passive bus / extended passive bus, point-to-point)
q
U reference point driver control
s
Line Termination Section
s
Conforms to TTC Standard JT-G961
q
f
equalizer
q
Bridged tap equalizer
s
T Reference Point Interface Section
q
The T reference point driver / receiver section can be separated from DSU section, and use
independently (TE mode). The user can enable or disable this feature as necessary.
s
Others
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+5 V single power supply
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Low power consumption
q
100 pin SQFP