DESCRIPTION
The NE5900 call progress decoder (CPD) is a low cost, low power CMOS integrated circuit designed to interface with a microprocessor-controlled smart telephone capable of making preprogrammed telephone calls. The call progress decoder information to permit microprocessor decisions whether to initiate, continue, or terminate calls. A tri-state, 3-bit output code indicates the presence of dial tone, audible ring-back, busy signal, or re-order tones.

FEATURES
• Fully decoded tri-state call progress status output
• Works with traditional, precision, or PBX call progress tones
• Low power consumption
• Low cost 3.58MHz crystal or clock
• No calibration or adjustment
• Interfaces with LSTLL, CMOS, NMOS
• Easy application

APPLICATIONS
• Modems
• PBXs
• Security equipment
• Auto dialers
• Answering machines
• Remote diagnostics
• Pay telephones