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PDF HT0638 Data sheet ( Hoja de datos )
| Número de pieza | HT0638 | |
| Descripción | Electronic Line Switch | |
| Fabricantes | Supertex Inc | |
| Logotipo |  |
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HT0638
HT0638
Electronic Line Switch
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
General Description
The Supertex HT0638 is an integrated electronic line switch
controllable from four logic-level inputs. These devices are
intended as a replacement for mechanical hook switches and
relays in telephones, answering machines, and similar telecom-
munications equipment. They switch the positive (Tip) side of the
telephone line using control inputs that are referenced to the
negative (Ring) side of the line. In the off state, it can hold-off 375
volts. In the on state, the series resistance is 15Ω maximum.
These devices provide adjustable current limiting via an external
sense resistor. Three of the control inputs are general purpose
and one is an override input that forces the switch to an off state
regardless of the state of the other inputs. This override input is
useful for ‘flash’ and pulse dialing purposes. Internal pull-up/
down resistors allow the inputs to be driven from single-ended
sources, push-pull sources, or left unconnected.
The HT0638 is powered from the phone line and are especially
useful in applications where external power is not available. Due
to their low quiescent current, both of these devices exceed the
on-hook resistance requirements of EIA-470-A.
Typical Application Circuit
TPG HT0640
TP
Tip
HKS
LS1
LS2
H = ON
L = OFF
Charge Pump
&
Logic Control
+
15V
CS - Low
Voltage
Telecom
IC
DP
Ring GND
For additional information, refer to application note
AN-H32.
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 s1pecifications 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.
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