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.

Features
Circuit Termination Section
■ Conforms to TTC Standard JT-I430 and JT-G961
● Digital four-wire time-division full-duplex operation
● Two-wire time compression multiplexing operation
● Transmission rate at U reference point: 320 kbit/s, at T reference point: 192 kbit/s
● Frame assembling and disassembling function
● State transition control
● Loopback function
● T reference point timing control (switch between short passive bus / extended passive bus, point-to-point)
● U reference point driver control

Line Termination Section
■ Conforms to TTC Standard JT-G961
● f equalizer
● Bridged tap equalizer

T Reference Point Interface Section
● 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.

Others
● +5 V single power supply
● Low power consumption
● 100 pin SQFP