The LS7540 is a CMOS integrated circuit for controlling the bright- ness of incandescent lamps by touch (Figures 5, 6, 8) or pushbut- ton (Figures 7, 9). When the LS7540 TOUCH input is connected to a lamp body, any metallic part of the lamp becomes a touch plate. A built-in AGC circuit allows for a wide range of lamp sizes to be used, ranging from small table lamps to large floor lamps. The brightness is controlled by varying the conduction angle of a Triac in series with the lamp and triggered by the TRIG/ output. Between off and maximum, there are 124 steps of brightness levels, level zero being off and level 124 being maximum. The phase reference of the TRIG/ signal with respect to the AC line is maintained through the SYNC input. By LSI Computer Systems, Inc.
LS7540 's PackagesLS7540 's pdf datasheet

LS7540 Pinout, Pinouts
LS7540 pinout,Pin out
This is one package pinout of LS7540,If you need more pinouts please download LS7540's pdf datasheet.

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