MC145442DW

The MC145442DW is designed as one kind of singlechip lowspeed modems and contains a complete frequency shift keying (FSK) modulator, demodulator, and filter.Specifications of it are CCITT V.21 (MC145442) and Bell 103 (MC145443).It provides fullduplex or halfduplex 300baud data communication over a pair of telephone lines.MC145442DW also includes a carrier detect circuit for the demodulator section and a duplexer circuit for direct operation on a telephone line through a simple transformer.

Features of the MC145442DW are:(1)compatible with Bell 103;(2)low-band and high-band band-pass filters on-chip;(3)simplex,half-duplex, and full-duplex operation;(4)originate and answer mode;(5)analog loopback configuration for self test;(6)hybrid network function on-chip;(7)carrier detect circuit on-chip;(8)adjustable transmit level and CD delay timing;(9)on-chip crystal oscillator (3.579 MHz);(10)single +5 V power supply operation;(11)internal mid-supply generator;(12)power-down mode;(13)pin compatible with MM74HC943;(14)capable of driving-9 dBm into a 600 W load.

The absolute maximum ratings of the MC145442DW can be summarized as:(1)supply voltage:-0.5 to +7.0 V(2)DC input voltage:-0.5 to Vdd+0.5 V;(3)DC output voltage:-0.5 to Vdd+0.5 V;(4)clamp diode current,per pin:+/-20 mA;(5)DC output current,per pin:+/-28 mA;(6)power dissipation:500 mW;(7)operating temperature range:-40 to +85;(8)storage temperature range:-65 to +150.If you want to know more information such as the electrical characteristics about the MC145442DW,please download the datasheet in www.seekic.com or www.chinaicmart.com .