HT18/HT19
Pin Description
Pin Name Description
1
2
3
4
5
6
6
7
8
TPG
HKS
GND
NC
LS
DP
DP
CS
TP
Positive input side of a telephone line, typically Tip side.
Hookswitch input. Connect HKS to TPG to turn on the hook switch. Internally pulled low with a high value
resistor.
Device ground. Negative side of a telephone line, typically Ring side.
No Connect. Open Circuit. No internal connections to the device.
Line switch input. Input logic high turns on the hook switch. Internally pulled low with a high value resistor.
For HT18. Dial pulse input. Input logic high turns off the hook switch. Used for pulse dialing. Internally
pulled low with a high value resistor.
For HT19. Dial pulse input. Input logic low turns off the hook switch. Used for pulse dialing. Internally
pulled high with a high value resistor.
Current sense input. An external resistor connected between CS and TP sets the current limit.
Positive output side of a telephone line. Zener protection to prevent this output from rising above 18V is
required.
8-Lead SOIC (Narrow Body) LG Package Outline
4.90 ± 0.10
8
6.00 ± 0.20
3.90 ± 0.10
Note 2
1
Top View
0.17 - 0.25
1.75 MAX
1.25 MIN
5° - 15°
(4 PLCS)
45°
0.25 - 0.50
Note 2
0° - 8°
0.10 - 0.25
1.27BSC
0.40 - 1.27
0.31 - 0.51
Side View
Notes:
1. All dimensions in millimeters. Angles in degrees.
2. If the corner is not chamfered, then a Pin 1 identifier
must be located within the area indicated.
End View
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline
information go to
http://www.supertex.com/packaging.html.)
Doc.# DSFP-HT18_HT19
A111006
4
SUPERTEX [ Supertex, Inc ]
