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