AS2574BN datasheet(1/24 Pages) AMSCO

部件名	AS2574BN

功能描述	20 NUMBER ONE TOUCH DIALLER WITH SERIAL BUS FOR DISPLAY DRIVER

PDF	24 Pages

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制造商	AMSCO [ams AG]

网页	http://www.ams.com

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Data Sheet

AS2574B

Rev. 1

1

Jan. 1995

Package

Available in 28 pin DIP and PLCC.

20 NUMBER ONE TOUCH DIALLER WITH

SERIAL BUS FOR DISPLAY DRIVER

Austria Mikro Systeme International

Key Features

u Low operating voltage (2.5V to 5.5V)

u Low current consumption (typ. 200

µA in LD mode)

u Oscillator using ceramic resonator (681 kHz)

u MF level independent of supply voltage

u Direct ´wake-up´ from keyboard

u Automatic Call Progress by direct memory key

u Data protection with 8 digit FIFO

u Sliding cursor protocol with comparison

u Diode options for different PTT requirements

u Automatic pause generation after access code

u Temporary MF select via keyboard

u 36 digit LNR (Last Number Redial)

u 20 memories addressable with direct keys and the

2nd key or indirect with a MEM key

u Notepad

u Serial interface to display driver AS2590

u Consistent, simple and useable procedures

u Input for dial tone recognizer

General Description

The AS2574B is an integrated CMOS device for feature

telephones. It is a very versatile LD/MF dialler with serial

interface to a display driver. The device is designed to be

used in a wide variety of applications together with the

companion display driver, AS2590.

The on chip RAM can contain up to 20 memories (each

with maximum 18 digits), a 36 digit Last Number Redial

(LNR) and an 18 digit notepad. Access to the 20 memo-

ries is either with direct keys, abbreviated dial code or a

combination of both. The AS2574B provides a unique

feature, Automatic Call Progress (ACP), on all memory

keys, i.e. the circuit automatically seizes the line and

waits for the dial tone and dials the number just by

pressing any of the memory keys (including LNR).

The circuit features 2 different access code procedures

to allow easy use under a PABX. A dial tone input

enables the use of a dial tone recognizer.

SDA

SCL

R5

C6

C5

C4

C3

C2

C1

VDD

HS

TONE

DP

R1

R2

R3

R4

ER

Vss

TB

AS2574B

La

Lb

E

LS

CD

MR

MT

M4

M8

M7

M6

M5

M2

M1

M3

MASK

OSC1

OSC2

681kHz

MUTE

R

ENTER

2ND

#

6

3

9

0

5

2

8

*

4

1

7

M10

MEM

M9

LNR

LS

SDA

SCL

VDD

X1

X2

V23

V13

VLCD

BIAS

MS

Vss

32.768kHz

DISPLAY

MODE

ACP

M/B

MS

Flash

Ground

Loop

SPEECH

LOUDHEARING

HANDSFREE

TONE RINGER

Application

High feature telephone sets.

Direct wake-up is an AMS patented

solution providing line seizing with

a telephone, that is entirely

powered from the telephone line,

by pressing a key in a key matrix

connected to a dialler/controller

that is constantly connected to the

line by means of a line voltage

limiter and yet maintaining a high

dc isolation resistance in idle state

(on-hook).

The wake-up feature allows the

user to go off-hook by pressing a

direct

memory

key

or

a

loudspeaker key, so-called on-

hook dialling or call progress

monitoring, and thereby seize the

line.

®

类似零件编号 - AS2574BN

制造商	部件名	数据表	功能描述
ams AG	AS2578	280Kb / 22P	TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS
	AS2578B	280Kb / 22P	TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS
	AS2578BN	280Kb / 22P	TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS
	AS2578BP	280Kb / 22P	TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS
	AS2578N	280Kb / 22P	TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS

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