Electronic Telephone Line Switch Supertex HT18LG HT19LG electroni

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Electronic Telephone Line Switch Supertex HT18LG HT19LG electroni

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HT18 HT19
Electronic Telephone Line Switch
Supertex HT18LG HT19LG electronic line switch circuits that replace mechanical hook switch contact discrete hook switch telephone handset modem. They switch positive side telephone line using control inputs that referenced negative side line. state, they withstand 350V positive input. state their series resistances maximum. devices provide current limiting determined external resistor. There three control inputs. turns hook switch when connected pin. This accomplished using mechanical switch which closes when handset physically off-hook. allows logic signal turn hook switch. dial pulse, used turn hook switch pulse dialing. HT18, dial pulse active high (DP) whereas HT19, active (DP).
Features
350V breakdown voltage maximum switch resistance Current limiting protection Operates 2.3V input
Applications
Telephone handsets Modems machines Answering machines Remote meter reading Phone interface products
Typical Application Circuit
RSEN
Transient Protection
HT18 HT19
Telecom Circuit
Ring
DP/DP
05/0503
Supertex Inc. does recommend products life support applications will knowingly sell products such applications unless receives adequate "products liability indemnification insurance agreement." Supertex does assume responsibility devices described limits liability replacement devices determined defective workmanship. responsibility assumed possible omissions inaccuracies. Circuitry specifications subject change without notice. latest product specifications, refer Supertex website: http://www.supertex.com. complete liability information Supertex products, refer most current databook Legal/Disclaimer page Supertex website.
HT18/HT19
Ordering Information
Package Option Breakdown Voltage 350V 350V Switch Resistance Dial Pulse DP/DP Active High Active SO-8 HT18LG HT19LG
Absolute Maximum Ratings
VTPG, Input line voltage VTP, Output line voltage DP/DP continuous input voltage Storage temperature Junction temperature Soldering temperature* Power dissipation
Notes: voltages referenced ground. *Distance 1.6mm from case seconds.
+350V +18V +10V -65°C +150°C +150°C +300°C Watt
Electrical Characteristics
(Over operating supply voltages unless otherwise specified, +50°C)
Symbol VTPG ITPG Parameter High voltage positive supply Input leakage current switch resistance ITPG-ITP Bias current ILIM IHKS VIL(HKS) VIH(HKS) VIL(LS), VIL(DP) VIH(LS), VIH(DP) TOFF ITPG current limiting input current logic input current logic input current input input high Input logic DP/DP Input logic high DP/DP Turn time Turn time VTPG VTPG=17V, ITPG=180mA, VTPG=3.0V, ITPG=20mA, VTPG=2.3V, ITPG=5mA, VTPG 5.0V, VTPG 10V, REXT VHKS 3.0V, 3.0V VTPG 3.0V VTPG 3.0V VTPG 3.0V VTPG 3.0V VTPG 4.5V VTPG 4.5V Unit Conditions ITPG 500µA, HKS, DP/DP open circuit VTPG 100V, HKS, DP/DP open circuit VTPG 290V, HKS, DP/DP open circuit
HT18/HT19
Truth Table
don't care logic level logic level high
Switch State
high impedance, open circuit
Block Diagram
HT19 HT18 Charge Pump Logic Control
Typical Application Circuit
RSEN
Transient Protection
HT18 HT19
Telecom Circuit
Ring
DP/DP
Description
Symb Description Positive input side telephone line, typically side. Hookswitch input. Connect turn hook switch. Internally pulled with high value resistor. Device ground. Negative side telephone line, typically Ring side. Connect. Open Circuit. internal connections device. Line switch input. Input logic high turns hook switch. Internally pulled with high value resistor. HT18. Dial pulse input. Input logic high turns hook switch. Used pulse dialing. Internally pulled with high value resistor. HT19. Dial pulse input. Input logic turns hook switch. Used pulse dialing. Internally pulled high with high value resistor. Current sense input. external resistor connected between sets current limit. Positive output side telephone line. Zener protection prevent this output from rising above required.
Configuration
DP/DP
view SO-8
HT18, HT19, Note: Package Outline section dimensions.
05/05/03rev.4
©2003 Supertex Inc. rights reserved. Unauthorized reproduction prohibited.
1235 Bordeaux Drive, Sunnyvale, 94089 TEL: (408) 222-8888 FAX: (408) 222-4895 www.supertex.com

Electronic Telephone Line Switch Supertex HT18LG HT19LG electroni

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