350V breakdown voltage maximum switch resistance Current limiting prot

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350V breakdown voltage maximum switch resistance Current limiting prot

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HT18 Electronic Telephone Line Switch
350V breakdown voltage maximum switch resistance Current limiting protection Operates 2.3V input
Supertex HT18LG electronic line switch circuit that replaces mechanical hook switch contact discrete hook switch telephone handset modem. switches positive side telephone line using control inputs that referenced negative side line. state, withstand 350V positive input. state, maximum series resistance device provides 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. dial pulse (DP) active high.
Applications
Telephone handsets Modems machines Answering machines Remote meter reading Telephone interface products
Typical Application Circuit
RSEN
Transient Protection
HT18
Telecom Circuit
Ring
HT18
Ordering Information
Package Option Device 8-Lead SOIC (Narrow Body)
4.90x3.90mm body 1.75mm height (max) 1.27mm pitch
HT18
indicates package RoHS compliant (`Green')
HT18LG-G
Absolute Maximum Ratings
Parameter VTPG, Input line voltage VTP, Output line voltage continuous input voltage Storage temperature Junction temperature Soldering temperature* Power dissipation Value +350V +18V +10V -65°C +150°C +150°C +300°C 0.8W
Configuration
(top view)
8-Lead SOIC (Narrow Body) (LG)
Product Marking HT18
Absolute Maximum Ratings those values beyond which damage device occur. Functional operation under these conditions implied. Continuous operation device absolute rating level affect device reliability. voltages referenced device ground. Distance 1.6mm from case seconds.
LLLL
Last Digit Year Sealed Week Sealed Number "Green" Packaging
8-Lead SOIC (Narrow Body) (LG)
Electrical Characteristics 25°C unless otherwise specified)
VTPG ITPQ Parameter switch resistance ITPG ILIM IHKS ILS, VIL(HKS) VIH(HKS) VIL(LS),VIL(DP) VIH(LS),VIH(DP) TOFF Bias current ITPG current limiting input current logic input current input input high Input logic Input logic high Turn-on time Turn-off time VTPG High voltage positive supply Input leakage current
Units
Conditions ITPG 500µA, HKS, open circuit VTPG 100V, HKS, open circuit VTPG 290V, HKS, LS,DP open circuit VTPG 17V, ITPG 180mA, VTPG 3.0V, ITPG 20mA, VTPG 2.3V, ITPG 5.0mA, VTPG 5.0V, VTPG 10V, REXT VHKS -70V 3.0V, 3.0V VTPG 3.0V VTPG 3.0V VTPG 3.0V VTPG 3.0V VTPG 4.5V VTPG 4.5V
HT18
Logic Truth Table
high impedance, open circuit don't care logic level logic level high
Switch State
Block Diagram
Charge Pump Logic Control
Description
Name 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. Dial pulse input. Input logic high turns hook switch. Used pulse dialing. Internally pulled 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.
HT18
8-Lead SOIC (Narrow Body) Package Outline (LG)
4.90x3.90mm body, 1.75mm height (max), 1.27mm pitch
Note (Index Area E1/2) Gauge Plane
Seating Plane
View
Note
View
View
Seating Plane
Side View
View
Note: This chamfer feature optional. present, then identifier must located index area indicated. Identifier molded mark/identifier; embedded metal marker; printed indicator.
Symbol
Dimension (mm)
1.35* 1.75
0.10 0.25
1.25 1.65*
0.31 0.51
4.80* 5.80* 3.80* 4.90 6.00 3.90 5.00* 6.20* 4.00*
1.27
0.25 0.50
0.40 1.27
1.04
0.25
JEDEC Registration MS-012, Variation Issue Sept. 2005. This dimension specified original JEDEC drawing. value listed reference only. Drawings scale. Supertex Doc. DSPD-8SOLGTG, Version G090808.
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information
Supertex inc. does recommend products life support applications, will knowingly sell them such applications unless receives adequate "product liability indemnification insurance agreement." Supertex inc. 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 inc. website: http//www.supertex.com.
©2008 rights reserved. Unauthorized reproduction prohibited.
Doc.# DSFP-HT18 B091508
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com

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