YTD436 is a high-performance communication LSI for the ISDN BRI user-network interface function (digital four-wire time-division full-duplex operation), supporting D channel layer 1 and layer 2 functions in one 100-pin SQFP chip.

特性 Features

1. Layer 1 function

? Conforms to ITU-T Recommendation I.430 (1992 edition) and

TTC Standard JT-I430 (1997 edition) (default)

- 192 kbps transmission rate

- Interface structure : 2B + D (B = 64 kbps, D = 16 kbps)

- Frame assembling and disassembling function

- Collision control (built-in random number (Ri) reset),

priority control (built-in retransmission control), and state transition control

- Programmable T3 and T4 timers

? Supports ETSI ETS 300 012 (April 1992) and ANSI T1.605 operating modes

? Leased line capability (JT-I430-a)

? Built-in driver and receiver

- I.430 TTL interface (when the driver / receiver is disconnected)

- No external relay or common-mode choke needed

- Supports 1-to-2 pulse transformer

? Abundant Test functions (for testing and maintenance)

- Demo mode in which no switch simulator is needed.

- Three kinds of loop-back modes (Loop-back 1 to 3)

- INFO signals output for testing

- Test pulse output for pulse shape check

? Multiframing capability

? INFO1 transmission and INFO4 reception monitor pins

? Power down monitor pin

? I.430 transmission frame phase adjustment function