Electronic Telephone Line Switch
Supertex inc.
HT19
Electronic Telephone Line Switch
Features
►►350V breakdown voltage ►►18Ω maximum switch resistance...
Description
Supertex inc.
HT19
Electronic Telephone Line Switch
Features
►►350V breakdown voltage ►►18Ω maximum switch resistance ►►Current limiting protection ►►Operates at 2.3V input
Applications
►►Telephone handsets ►►Modems ►►Fax machines ►►Answering machines ►►Remote meter reading ►►Telephone interface products
General Description
The Supertex HT19LG is an electronic line switch circuit that replaces the mechanical hook switch contact or a discrete hook switch in a telephone handset or modem. It switches the positive side of the telephone line using control inputs that are referenced to the negative side of the line. In its off state, it can withstand 350V on the positive input. In its on state, it has a maximum series resistance of 18Ω.
The device provides current limiting determined by an external resistor. There are three control inputs. The HKS pin turns on the hook switch when connected to the TPG pin. This can be accomplished by using a mechanical switch which closes when the handset is physically off-hook. The LS pin allows a logic signal to turn on the hook switch. The dial pulse, Pin 6, is used to turn the hook switch off for pulse dialing. The dial pulse (DP) is active low.
Typical Application Circuit
Tip
Transient Protection
Ring
TPG
TP
HKS
HT19
RSEN CS 15V
LS
Telecom Circuit
DP
GND
Doc.# DSFP-HT19 B031414
Supertex inc. www.supertex.com
Ordering Information
Part Number Package
Packing
HT19LG-G 8-Lead SOIC (Narrow Body) 2500/Reel
-G denotes a lead (Pb)-f...
Similar Datasheet