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Technical content

Features

❑ 15Ω maximum switch resistance ❑ Current limiting protection ❑ 4 logic control inputs ❑ Operates at 2V input ❑ 2µA maximum quiescent current at 100V

Applications

❑ Telephone handsets ❑ Fax machines ❑ Answering machines ❑ Auto-dial alarm systems 08/23/02 Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website. For additional information, refer to application note AN-H32. Typical Application Circuit /K4C/K6F/K77 /K56/K6F/K6C/K74/K61/K67/K65 /K54/K65/K6C/K65/K63/K6F/K6D /K49/K43 /K54/K50/K47 /K48/K54/K30/K36/K34/K30 /K54/K50 /K43/K53 /K47/K4E/K44 /K48/K4B/K53 /K4C/K53/K31 /K4C/K53/K32 /K44/K50 /K48/K3D/K4F /K4E /K4C/K3D /K4F/K46/K46 /K43/K68/K61/K72/K67/K65 /K50/K75/K6D/K70 /K26 /K4C/K6F/K67/K69/K63 /K43/K6F/K6E/K74/K72/K6F/K6C /K2B /K31/K35/K56 /K2D /K54/K69/K70 /K52/K69/K6E/K67

VTPG , Input line voltage +375V VTP , Output line voltage +18V HKS continuous input voltage V TPG LS1, LS2 continuous input voltage +20V DP continuous input voltage +5V Storage temperature –65 °C to +150°C Soldering temperature* +300 °C Notes: All voltages are referenced to ground. *Distance of 1.6mm from case for 10 seconds.

Ordering Information

Breakdown Voltage Switch Resistance Package Option SO-8 375V 15 Ω HT0638LG Typical Performance Curve 350 300 250 200 150 100 100 200 300 400 500 R SENSE (ohms) ILIMIT vs. RSENSE 600 700 800 900 1000 ILIMIT (mA) Block Diagram TPG TP CS GND HKS LS1 LS2 DP H = ON L = OFF Charge Pump Logic Control

HKS LS1 LS2 DP Switch State XXH H or Z ON XHX H or Z ON HXX H or Z ON L or Z L or Z L or Z X OFF XXX L OFF Z= high impedance, open circuit X= don’t care L= logic level low H= logic level high Symbol Parameter Min Typ Max Unit Conditions VTPG High voltage positive supply 375 V ITP = 10µA, HKS, LS1, LS2, DP = open circuit ITPQ Input leakage current 2.0 µA VTPG = 100V, HKS, LS1, LS2, DP = open circuit

10 VTPG = 375V, HKS, LS1, LS2,

DP = open circuit VTP Output voltage 16 18 20 V V TPG = 50V, No Load R SW TPG to TP switch resistance 15 Ω VTPG =4.3V, ITPG =180mA, SW= On 15 VTPG =3.0V, ITPG =20mA, SW= On, TA=0°C to 50°C 30 VTPG =2.0V, ITPG =5mA, SW= On TA=0°C to 50°C ITPG -ITP Bias current 50 µA VTPG = 5.0V, SW = On

100 V TPG = 10V, SW = On

ILIM ITPG current limiting 200 300 mA R EXT = 430Ω IHKS HKS input current 200 µAV HKS = 50V ILS1 LS1 input current 136 µAV LS1 = 3.0V, VDP = 0V ILS2 LS2 input current 136 µAV LS2 = 3.0V, VDP = 0V IDP DP output current 500 µA VDP = 0V, VHKS = 50V, VLS1=V LS2 = 3.0V VIL(HKS) HKS input low 0 0.2 V VIH(HKS) HKS input high 2.0 V TPG V VIL(LS1), LS1 and LS2 input low 0 0.2 VVIL(LS2) VIH(LS1), LS1 and LS2 input high 1.0 20 VVIH(LS2) VIL(DP) DP input low 0 0.2 V VIH(DP) DP input high 1.0 5.0 V TON Turn on time 1.0 ms V TPG = 4.5V TOFF Turn off time 1.0 ms V TPG = 4.5V

Electrical Characteristics

(over operating supply voltages unless otherwise specified, TA = -40°C to +85°C)

1235 Bordeaux Drive, Sunnyvale, CA 94089

TEL: (408) 744-0100 • FAX: (408) 222-4895 www.supertex.com 08/23/02 ©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. Pin Description TPG Positive input side of a telephone line, typically Tip side. TP Positive output side of a telephone line. HKS Hookswitch input. Connect HKS to TPG to turn on the electronic switch. Internally pulled low. LS1 Line switch 1 input. Positive input turns on the electronic switch. Internally pulled low. LS2 Line switch 2 input. Positive input turns on the electronic switch. Internally pulled low. DP Dial pulse input. A low input turns off the electronic switch. Use for pulse dialing. Internally pulled high. CS Current sense input. An external resistor connected between CS and TP sets the current limit. Short C S to TP if current limiting is not used. GND Device ground. Negative side of a telephone line, typically Ring side. Pin Configuration TPG TP HKS CS GND DP LS2 LS1 Note: See Package Outline section for dimensions. top view SO-8