MC14LC5447

This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields. However, it is advised that normal precautions be taken to avoid applications of any voltage higher than maximum rated voltages to this high impedance circuit. For proper operation it is recommended that Vin and Vout be constrained to the range V_SS (V_in or Vout) V_DD.

Reliability of operation is enhanced if unused inputs are tied to an appropriate logic voltage level (e.g., either V_SS or V_DD).

The MC14LC5447 is a silicon gate HCMOS IC designed to demodulate Bell 202 and V.23 1200baud FSK asynchronous data. The primary application for this device is in products that will be used to receive and display the calling number, or message waiting indicator sent to subscribers from participating central office facilities of the public switched network. The MC14LC5447 also contains a carrier detect circuit and ring detector which may be used to power up the device.

Applications for MC14LC5447 include adjunct boxes, answering machines,feature phones, fax machines, and computer interface products.

The MC14LC5447 offers the following performance features.
• Ring Detector OnChip
• Ring Detect Output for MCU Interrupt
• PowerDown Mode, Less than 1 A
• Single Supply: + 3.5 to + 6.0 V
• Pin Selectable Clock Frequencies: 3.68 MHz, 3.58 MHz, or 455 kHz
• Two Stage PowerUp for Power Management Control
• Demodulates Bell 202 and V.23