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ST3917BN

Description
SPEECH - TONE/PULSE DIALER - LED INDICATOR
CategoryWireless rf/communication    Telecom circuit   
File Size149KB,16 Pages
ManufacturerSTMicroelectronics
Websitehttp://www.st.com/
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ST3917BN Overview

SPEECH - TONE/PULSE DIALER - LED INDICATOR

ST3917BN Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
MakerSTMicroelectronics
Parts packaging codeDIP
package instructionDIP, DIP28,.6
Contacts28
Reach Compliance Code_compli
JESD-30 codeR-PDIP-T28
JESD-609 codee0
length36.83 mm
damage rate1:2
Number of functions1
Number of terminals28
Maximum operating temperature70 °C
Minimum operating temperature-25 °C
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP28,.6
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
power supply3 V
Certification statusNot Qualified
Maximum slew rate0.0009 mA
Nominal supply voltage3 V
surface mountNO
technologyCMOS
Telecom integrated circuit typesTELEPHONE MULTIFUNCTION CIRCUIT
Temperature levelOTHER
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width15.24 mm
ST3917A
ST3917B
SPEECH - TONE/PULSE DIALER - LED INDICATOR
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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

ST3917BN Related Products

ST3917BN ST3917 ST3917B ST3917AD ST3917BD 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 DIP - - SOIC SOIC DIP -
package instruction DIP, DIP28,.6 - - SOP, SOP28,.4 SOP, SOP28,.4 DIP, DIP28,.6 -
Contacts 28 - - 28 28 28 -
Reach Compliance Code _compli - - _compli _compli _compli -
JESD-30 code R-PDIP-T28 - - R-PDSO-G28 R-PDSO-G28 R-PDIP-T28 -
JESD-609 code e0 - - e0 e0 e0 -
length 36.83 mm - - 17.9 mm 17.9 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 DIP - - SOP SOP DIP -
Encapsulate equivalent code DIP28,.6 - - SOP28,.4 SOP28,.4 DIP28,.6 -
Package shape RECTANGULAR - - RECTANGULAR RECTANGULAR RECTANGULAR -
Package form IN-LINE - - SMALL OUTLINE SMALL OUTLINE 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 NO - - YES YES 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 THROUGH-HOLE - - GULL WING GULL WING THROUGH-HOLE -
Terminal pitch 2.54 mm - - 1.27 mm 1.27 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 15.24 mm - - 7.5 mm 7.5 mm 15.24 mm -
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