YM7303

The YM7303 (IDNI92) is a kind of ISDN basic access controller.It provides the ISDN User-Network interface function (Full-Duplex, 4-Wire Operation).

There are some features of YM7303 as follows.First is layer 1 which is compatible with CCITT I.430 Recommendation (1988 edition) and with IIC Standard JT-I430 (1988 edition) and includes full-duplex, 4-wire 192 Kbps tranceiver, frame assembling and disassembling function, loop-back/test function (for test and maintenance), input/output terminals for multi-framing and built-in driver and receiver.The second is layer 2 which includes HDLC frame control, LAP-D status control, built-in time for timeout/check and multi-link capability.Then is layer 3 interface function which can be connected to 8-bit or 16-bit miroprocessors (8086 family, Z80,6800,68000).Next is power-down mode (operation with low power consumption).The sixth is CMOS technology with single +5 V supply.The last one is 80-pin QFP.

What comes next is about the absolute maximum ratings of YM7303.The VDD (power supply voltage) is from -0.3 V to +7.0 V.The VIN (input voltage) is from -0.3 V to VDD+0.3 V.The TOP (ambient operating temperature) is from 0 to +70.The TST (storage temperature) is from -50 to +125.Then is about the recommended operating conditions.The supply voltage is 5 V ± (5%) (based on DVSS, AVSS=0.0 V).The ambient operating temperature is from 0 to +70.