ASOT ASOTR ASOTR1 ASOTT ASOTT1 (631) 271-0400 (631) 271-0405
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ASOT ASOTR ASOTR1 ASOTT ASOTT1
(631) 271-0400 (631) 271-0405
Computer Systems, Inc. 1235 Walt Whitman Road, Melville, 11747
A3800
AUTOMATIC SHUT-OFF TIMERS
FEATURES: Minimizes external components power consumption Factory calibrated timer Mask programmable from minutes hours APPLICATIONS Control household appliances, heaters, lighting motors. DESCRIPTION basic ASOT CMOS integrated circuit timer that mask programmed from minutes hours shown Table output used turn relay duty cycle which mask programmed from 37.5% 2.5% steps shown Table duty cycle selected optimize operation particular relay coil. There different versions ASOT 3-Pin version housed TO-92 package. application schematic shown Figure When latching switch closed, output turns energizing relay keeping switch closed. When programmed time-out expires, output turns deenergizing relay causing switch open. ASOTR 4-Pin version shown Figure output turns same manner 3-Pin version. momentary switch closed, timer resets starts timing again. input internal pull-up resistor. Every subsequent momentary switch closure resets timer. 3-Pin version, output remains until timeout expires. ASOTT also 4-Pin version shown Figure this version contacts replace switch accessible. application power caused closing TABLE Timeout Numbers
DIP/SOIC
January 2002
ASOTR1 ASOTT1
DUTY CYCLE
8-PIN VERSION TO-92
ASOT ASOTR ASOTT
3-PIN VERSION
4-PIN VERSION
FIGURE PACKAGE OPTIONS
momentary switch causes output toggle 3-Pin version. momentary switch closed again, output toggles causing contact open power removed. input internal pull-up resistor. default operaton output produces double duty cycle first milliseconds output activation increase pull-in torque relay. option remove this feature factory selectable ASOT (3-Pin), ASOTR (4-Pin) ASOTT (4-Pin) versions. There also 8-Pin versions available which allow user change this feature. ASOTR1 8-Pin version used Figure application ASOTT1 8-Pin version used Figure application. both cases, duty cycle input internal pull-up resistor. Tying input removes double duty cycle feature.
Auto Shut-Off Times 2.5m 7.5m 37.5m
12.5m
17.5m 52.5m
22.5m
TABLE
Duty Cycle Numbers
Duty Cycle Percentages 12.5 27.5
32.5
17.5
37.5
22.5
7214-011702-1
ABSOLUTE MAXIMUM RATINGS: (All voltages referenced VSS) Maximum Input Operating Temperature Storage Temperature ELECTRICAL CHARACERISTICS: (All voltages referenced Vss) PARAMETER Shunt Regulator Voltage Regulator Sink Current Supply Current Power-On-Reset Hysteresis Output Driver Output Driver Output Frequency Switch Delay INPUT Switching Voltage Source Current @VIN SYMBOL VPOR VHYS 20.5 21.8 23.11 UNIT CONDITION VPOR SYMBOL TSTG VALUE +150 UNIT
ASOTR, ASOTT ASOTR
Positive Clamp Voltage @Input Sink Current 350µA Negative Clamp Voltage @Input Sink Current 350µA Duty Cycle Select Source Current @VIN
ASOTT ASOTT
ASOTR1, ASOTT1
DUTY CYCLE
FIGURE
ASOT
FIGURE ASOTT, ASOTT1 This input available only ASOTT1
DUTY CYCLE
information included herein believed accurate reliable. However, Computer Systems, Inc. assumes responsibilities inaccuracies, infringements patent rights others which result from use.
FIGURE ASOTR, ASOTR1 This input available only ASOTR1
7214-011702-2
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