NT91214 Ver la hoja de datos (PDF) - Unspecified

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NT91214

Tone/Pulse Dialer

Unspecified 

NT91214/15 Series

Pin Descriptions

Pin No.

NT91215A NT91215B NT91215C NT91215D Designation I/O

NT91214A NT91214B NT91214C NT91214D

Description

3

3

4

4

OSCI

I Oscillator Input and Output pins

4

4

5

5

OSCO

The time base for the NT91214/15 is a

crystal controlled on-chip oscillator,

which is completed by connecting a

3.58MHz crystal or ceramic resonator

between the OSCI and OSCO pins.

2

2

3

3

MODE IN I, Z TRI-STATE mode select pin

There are two versions of the

NT91214/15 as follows:

a. NT91215 Series is for European and

American systems.

MODE

IN

VDD

Tone/

Pulse

Pulse

Dial

Rate

10pps

M/B

Ratio

2/3

VSS

Tone

-

-

Floating Pulse 10pps 1/2

b. The NT91214 Series is for the

Japanese system.

MODE

IN

VDD

Tone/

Pulse

Pulse

Dial

Rate

10pps

M/B

Ratio

1/2

VSS

Tone

-

-

Floating Pulse 20pps 1/2

The mode selection pin is checked for

tone/pulse dialing as each digit key

entery. In the PULSE mode, the dialing

rate is checked, along with the

make/break ratio, at first key entry.

6

V1.0

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