ASOT

www.datasheet4u.com UL ® LSI/CSI ADVANCE INFORMATION ASOT ASOTR ASOTR1 ASOTT ASOTT1 (631) 271-0400 FAX (631) 271-0405 LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 A3800 3, 4 AND 8 PIN AUTOMATIC SHUT-OFF TIMERS FEATURES: Minimizes external components and power consumption Factory calibrated timer Mask programmable from 2.5 minutes to 32 hours APPLICATIONS Control of household appliances, heaters, lighting and AC motors. DESCRIPTION The basic ASOT is a CMOS integrated circuit timer that can be mask programmed from 2.5 minutes to 32 hours as shown in Table 1. The output of the IC is used to turn on a 12V relay and has a duty cycle which can be mask programmed from 5% to 37.5% in 2.5% steps as shown in Table 2. The duty cycle can be selected to optimize operation for a particular relay coil. There are 5 different versions of the IC. The ASOT is a 3-Pin version housed in a TO-92 package. The application schematic is shown in Figure 2. When latching switch S1 is closed, the output turns on energizing relay L1 and keeping switch S1 closed. When the programmed time-out expires, the output turns off deenergizing relay L1 and causing switch S1 to open. The ASOTR is a 4-Pin version as shown in Figure 3. The output turns on in the same manner as in the 3-Pin version. If momentary switch S2 is closed, the timer resets and starts timing out again. The S2 input has an internal pull-up resistor. Every subsequent momentary switch closure resets the timer. ...