ST3938A - SPEECH - TONE/PULSE DIALER - LED INDICATOR

Product Overview

STMicroelectronics

Datasheet Details

Part number	ST3938A
Manufacturer	STMicroelectronics
File Size	206.81 KB
Description	SPEECH - TONE/PULSE DIALER - LED INDICATOR
Datasheet	ST3938A Datasheet
Additional preview pages of the ST3938A datasheet.

Product details

Description

The device consists of the speech and the dialer functions.

It provides the DC line interface circuit that terminates the telephone line, analog amplifier for speech transmission and necessary signals for either DTMF and pulse dialing.

Features

provided by the PABX or central office. The PAUSE key stores a timed pause in the number sequence. Redial is then delayed until an outside line can be accessed or some other activities occur before normal signalling resumes. A LND key automatically redials the last number dialed. Adedicatedpin MU/MFI is used to select the muting for transmit amplifier and lighted dial LED for keyboard illumination or a LEDindicator for tonemode indication. The SEL pin allows selection of any one of the four poss.

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Published: Jul 16, 2008 |