75T2089 View Datasheet(PDF) - TDK Corporation

Part Name

Description

Manufacturer

75T2089

DTMF Transceivers

TDK Corporation 

75T2089/2090/2091

DTMF Transceivers

CALL PROGRESS DETECTOR: Electrical Characteristics (Continued)

PARAMETER

CONDITIONS

MIN

TON Signal Time for Detect

40

TON Signal Time for No Detect

TOFF Interval Time for Detect

TOFF Interval Time for No Detect

TD2 Detect Time

TR2 Release Time

NOM MAX

10

40

20

40

40

UNIT

ms

ms

ms

ms

ms

ms

TON

TOFF

tone burst 1

DIN

TD1

TR1

tone burst 2

DV

TSU1

D0, D1, D2, D3

TED

* ED

TER

THD1

*75T2091 only

FIGURE 6: DTMF Decoder

TON

TOFF

tone burst 1

DIN

TD1

TR1

DV

TSU1

D0, D1, D2, D3

tone burst 2

THD1

FIGURE 7: Call Progress Detector

(75T2090/2091 only)

D4, D5, D6, D7

LATCH

RESET

DTMF OUT

THD2

TSU2

TPW

TPW

TSTART

(SEE NOTE)

TRP

NOTE: THE INDICATED TIME MAY BE AS SMALL AS 0 SEC., MEANING THAT THE

LATCH AND RESET LINES MAY BE TIED TOGETHER.

FIGURE 8: DTMF Generator

7

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