SSI73K222U

SSI73K222U is a compact, high performance modem which includes a 8250A/16C450 compatible UART with the 1200 bit/s modem function on a single chip.

There are some features of SSI73K222U as follows. First is modem/UART combination optimized for intergral bus applications. Secondly, high speed UART will interface directly with high clock rate bus with no wait states. Besides, dual-port mode suits conventional designs using local microprocessor for transparent modem operation. Furthermore, it includes DTMF generator, carrier, call-progress and precise answer-tone derectors for intellgent dialing capability. The fifth is on chip 2-wire/4-wire hybrid driver and off-hook relay buffer. The sixth is speak output with four-level software driven volume. The last one is low power CMOS (40 mW) with power down mode (15 mW).

The following is about the absolute maximum ratings of SSI73K222U. The VDD (supply voltage) is 7 V. The applied voltage is from -0.3 to VDD+0.3 V. The TSTG (storage temperature) is from -65 to +150. The soldering temperature (10 sec) is 260. Then is about the recommended operating conditions. The minimum VDD (supply voltage) is 4.5 V, the typical is 5 V and the maximum is 5.5 V. The operating free air temperature is from -40 to +85. The minimum VREF bypass capacitor (VREF to GND) is 0.1F. The minimum bias setting resistor is 1.8 M, the typical is 2 M and the maximum is 2.2 M when placed between VDD and ISET pins. The minimum ISET bypass capacitor (ISET pin to GND) is 0.1F. The minimum VDD bypass capacitor (VDD to GND) is 0.1F.