ST3917BD datasheet, PDF - EEWORLD Datasheet

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ST3917BD: DescriptionSPEECH - TONE/PULSE DIALER - LED INDICATOR; CategoryWireless rf/communication Telecom circuit; File Size149KB，16 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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ST3917BD Overview

SPEECH - TONE/PULSE DIALER - LED INDICATOR

ST3917BD Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	STMicroelectronics
Parts packaging code	SOIC
package instruction	SOP, SOP28,.4
Contacts	28
Reach Compliance Code	_compli
JESD-30 code	R-PDSO-G28
JESD-609 code	e0
length	17.9 mm
damage rate	1:2
Number of functions	1
Number of terminals	28
Maximum operating temperature	70 °C
Minimum operating temperature	-25 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP28,.4
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
power supply	3 V
Certification status	Not Qualified
Maximum seat height	2.65 mm
Maximum slew rate	0.0009 mA
Nominal supply voltage	3 V
surface mount	YES
technology	CMOS
Telecom integrated circuit types	TELEPHONE MULTIFUNCTION CIRCUIT
Temperature level	OTHER
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	7.5 mm

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ST3917A

ST3917B

SPEECH - TONE/PULSE DIALER - LED INDICATOR

SPEECH CIRCUIT

2 TO 4 WIRES CONVERSION

PRESENT THE PROPER DC PATH FOR THE LINE

CURRENT AND THE FLEXIBILITY TO ADJUST IT

ANDALLOWPARALLEL PHONE OPERATION

SYMMETRICAL HIGH IMPEDANCE MICRO-

PHONE INPUTS SUITABLE FOR DYNAMIC,

ELECTRET OR PIEZOELECTRIC TRANSDUCER

ASYMMETRICAL EARPHONE OUTPUT SUIT-

ABLE FOR DYNAMIC TRANSDUCER

LINE LOSS COMPENSATION FIXED INTER-

NALLY BY A.G.C.

INTERNAL MUTING TO DISABLE SPEECH

DURING DIALING AND EXTERNAL MUTING

TO DISABLE TRANSMIT AMPLIFIER DURING

CONVERSATION MODE

LED INDICATOR EITHER FOR KEYBOARD ILLU-

MINATION (OR ON-LINE INDICATION) DURING

DIALING AND CONVERSATION OR FOR TONE

MODE INDICATION, THROUGH MU/MFI PIN

DIALER CIRCUIT

STORE UP TO 32 DIGITS FOR LAST NUMBER

REDIAL BUFFER, LNR IS INHIBITED IF THERE

ARE MORE THAN 32 DIGITS STORED

ALLOWMIXED MODE DIALING IN PULSE MODE

PACIFIER TONE PROVIDES AUDIBLE INDI-

CATION OF VALID KEY PRESSED IN A BUZZ-

ER OR/AND IN THE EARPHONE

TIMED PABX PAUSE / 10PPS PULSE RATE

MAKE/BREAK RATIO : 40/60 (ST3917A) AND

33/67 (ST3917B)

4 SELECTABLE OPTIONS ON FLASH DURA-

TION AND SOFTSWITCH INHIBITION IN ONE

OF THE OPTION WITH 100ms FLASH TIMING

2 SELECTABLE OPTIONS : TRANSMIT MUTE

TOGETHER WITH LED FOR KEYBOARD ILLUMI-

NATION OR LED FOR TONE MODE INDICATION

CONTINUOUS TONE FOR EACH DIGIT UNTIL

KEY RELEASE

USES INEXPENSIVE 3.579545MHz CERAMIC

RESONATOR

POWERED FROM TELEPHONE LINE, LOW

OPERATING VOLTAGE FOR LONG LOOP AP-

PLICATION

July 1996

DESCRIPTION

The device consists of the speech and the dialer func-

tions. It provides the DC line interface circuit that termi-

nates the telephone line, analog amplifier for speech

transmission and necessary signals for either DTMF

and pulse dialing. When mated with a tone ringer, a

complete telephonecan be producedwith just two ICs.

TheDClineinterfacecircuit developsits ownlinevoltage

acrossthedeviceandit is adjustableby externalresistor

to suit different country’s specification. A built-in LED

driver can deliver excess line current to external LED

indicator(s) during dialing and speech mode. The

LED(s) can be used either for keyboard illumination

purpose or for tone mode indication during softswitch

and mixed mode dialing by connecting MU/MFI pin to

VDDandGND oranyrowrespectively.The LEDcurrent

is limited to 17mA (typical).

The speech network provides the two to four wires inter-

face,electronic switchingbetweendialingandspeechand

automaticgain control on transmit and receive.

The dialing network buffers up to 32 digits into the LND

memorythatcan be laterredialedwith asinglekeyinput.

Users can store all 13 signalling keys and access

several unique functions with single key entries. These

functions include : Pause, Last Number Dialled (LND),

Softswitch and Flash. (see Figure 1).

The FLASH key simulates a hookflash to transfercalls

or to activate other special 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

possible Flash duration options.

DIP28

(Plastic Package)

ORDER CODES :

ST3917AN - ST3917BN

SO28

(Plastic Package)

ORDER CODES :

ST3917AD - ST3917BD

1/16

ST3917BD Related Products

	ST3917BD	ST3917	ST3917B	ST3917AD	ST3917BN	ST3917AN	ST3917A
Description	SPEECH - TONE/PULSE DIALER - LED INDICATOR	SPEECH - TONE/PULSE DIALER - LED INDICATOR	SPEECH - TONE/PULSE DIALER - LED INDICATOR	SPEECH - TONE/PULSE DIALER - LED INDICATOR	SPEECH - TONE/PULSE DIALER - LED INDICATOR	SPEECH - TONE/PULSE DIALER - LED INDICATOR	SPEECH - TONE/PULSE DIALER - LED INDICATOR
Is it Rohs certified?	incompatible	-	-	incompatible	incompatible	incompatible	-
Parts packaging code	SOIC	-	-	SOIC	DIP	DIP	-
package instruction	SOP, SOP28,.4	-	-	SOP, SOP28,.4	DIP, DIP28,.6	DIP, DIP28,.6	-
Contacts	28	-	-	28	28	28	-
Reach Compliance Code	_compli	-	-	_compli	_compli	_compli	-
JESD-30 code	R-PDSO-G28	-	-	R-PDSO-G28	R-PDIP-T28	R-PDIP-T28	-
JESD-609 code	e0	-	-	e0	e0	e0	-
length	17.9 mm	-	-	17.9 mm	36.83 mm	36.83 mm	-
damage rate	1:2	-	-	1:1.5	1:2	1:1.5	-
Number of functions	1	-	-	1	1	1	-
Number of terminals	28	-	-	28	28	28	-
Maximum operating temperature	70 °C	-	-	70 °C	70 °C	70 °C	-
Minimum operating temperature	-25 °C	-	-	-25 °C	-25 °C	-25 °C	-
Package body material	PLASTIC/EPOXY	-	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	-
encapsulated code	SOP	-	-	SOP	DIP	DIP	-
Encapsulate equivalent code	SOP28,.4	-	-	SOP28,.4	DIP28,.6	DIP28,.6	-
Package shape	RECTANGULAR	-	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	-
Package form	SMALL OUTLINE	-	-	SMALL OUTLINE	IN-LINE	IN-LINE	-
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	-	-	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	-
power supply	3 V	-	-	3 V	3 V	3 V	-
Certification status	Not Qualified	-	-	Not Qualified	Not Qualified	Not Qualified	-
Maximum slew rate	0.0009 mA	-	-	0.0009 mA	0.0009 mA	0.0009 mA	-
Nominal supply voltage	3 V	-	-	3 V	3 V	3 V	-
surface mount	YES	-	-	YES	NO	NO	-
technology	CMOS	-	-	CMOS	CMOS	CMOS	-
Telecom integrated circuit types	TELEPHONE MULTIFUNCTION CIRCUIT	-	-	TELEPHONE MULTIFUNCTION CIRCUIT	TELEPHONE MULTIFUNCTION CIRCUIT	TELEPHONE MULTIFUNCTION CIRCUIT	-
Temperature level	OTHER	-	-	OTHER	OTHER	OTHER	-
Terminal surface	Tin/Lead (Sn/Pb)	-	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-
Terminal form	GULL WING	-	-	GULL WING	THROUGH-HOLE	THROUGH-HOLE	-
Terminal pitch	1.27 mm	-	-	1.27 mm	2.54 mm	2.54 mm	-
Terminal location	DUAL	-	-	DUAL	DUAL	DUAL	-
Maximum time at peak reflow temperature	NOT SPECIFIED	-	-	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	-
width	7.5 mm	-	-	7.5 mm	15.24 mm	15.24 mm	-

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