YTD402

The Model YTD402 is an LSI to provide a circuit required to link the DTE (data terminal equipment) having V.24, X.21 and X.21 bis interfaces to the ISDN.The typical applications include terminal adapter for ISDN, inter-working function between the ISDN and PSTN (public switched telephone network), line card for PABX (private automatic branch exchange) and cash dispenser.

There are some features of YTD402 as follows.First is automatic connection and disconnection from data transmission phase.The second is network-independent clock support.Then is sync/async conversion according to V.14.Next is network speed 64 Kbps to 2048 Kbps (programmable to a maximum of 32 time slots).The fifth is in-bound parameter exchange support.The sixth is 8-bit microprocessor interface.The seventh is three types of loop back modes and stand-by mode.The last one is single 5-volt power supply with power-saving CMOS.

What comes next is about the absolute maximum ratings of YTD402.The minimum VDD (power supply voltage) is -0.3 V and the maximum is +0.7 V.The minimum VIN (input voltage) is -0.3 V and the maximum is VDD+0.3 V.The TA (operating temperature) is from 0 to 70.The TST (storage temperature) is from -50 to +125.Then is about the recommended operating conditions.The power supply voltage is 5 V±5%.The operating temperature is from 0 to 70.

The following is about the DC characteristics of YTD402.The minimum VIH (input high voltage) is 2.0 V and the maximum is VDD+0.3 V.The minimum VIL (input low voltage) is -0.3 V and the maximum is 0.8 V.The minimum VOH (output high voltage) is 2.4 V at IOH=-400A and is VDD-0.5 V at IOH=-200A .The maximum VOL (output low voltage) is 0.4 V at IOL=1.6 mA.