Philips Semiconductors

Product specification

NE5900

Call progress decoder

1

1986 May 8

853-0842 83667

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.

A front-end bandpass filter is accomplished with switched

capacitors. The bandshaped signal is detected and the cadence is

measured prior to output decoding. In addition to the three data bits,

a buffered bandpass output and envelope output are available. All

logic inputs and outputs can interface with LSTTL, CMOS and

NMOS.

Circuit features include low power consumption and easy

application. Few and inexpensive external components are

required. A typical application requires a 3.58MHz crystal or clock,

470k

Ω resistor, and two bypass capacitors. The NE5900 is effective

where traditional call progress tones, PBX tones, and precision call

progress tones must be correctly interpreted with a single circuit.

FEATURES

PIN CONFIGURATION

TRI-STATE ENABLE

DATA VALID

BIT 2

BIT 3

BIT 1

ENVELOPE

ANALOG OUT

5V

EXT CLOCK IN/XTAL1

0V

CLEAR IN

COUNT IN PROGRESS

TEST IN

XTAL2

INPUT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

16

15

NOTE:

1. SOL — Released in large SO package only.

TOP VIEW

SR01142

Figure 1. Pin Configuration

APPLICATIONS

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

16-Pin Plastic Small Outline (SOL) Package

0 to +70

NE5900DK

SOT162-1

16-Pin Plastic Dual In-Line (DIP) Package

0 to +70

NE5900N

SOT38-4