LM56CIMM

The LM56CIMM is one member of the LM56 series.The LM56 is a precision low power thermostat.Two stable temperaturetrippoints(97VT1 and VT2 )are generated by dividing down the LM56 1.250V bandgap voltage reference using 3 external resistors.The LM56 has two digital outputs.OUT1 goes LOW when the temperature exceeds T1 and goesHIGH when the the temperature goes below (T1THYST).Similarly, OUT2 goes LOW when the temperature exceeds T2 and goes HIGH when the temperature goes below(T2THYST ).THYST is an internally set 5?C typical hysteresis.The LM56 is available in an 8-lead Mini-SO8 surface mount package and an 8-lead small outline package.

Features of the LM56CIMM are:(1)digital outputs support TTL logic levels; (2)internal temperature sensor; (3)2 internal comparators with hysteresis; (4)internal voltage reference; (5)currently available in 8-pin SO plastic package; (6)future availability in the 8-pin mini-SO8 package.The individual errors do not add algebraically because, the odds of all the errors being at their extremes are rare.This is proven by the fact the specification for the trip point accuracy stated in the Electrical Characteristic for the temperature range of -40 to +125, for example, is specified at ±3 for the LM56BIM.

The absolute maximum ratings of the LM56CIMM can be summarized as:(1)input voltage:12 V;(2)storage temperature range:-65 to +150;(3)operating temperature range:TMINTA T MAX;(4)input current at any pin (note 2):5 mA;(5)package input current(note 2):20 mA.Absolute maximum ratings indicate limits beyond which damage to the device may occur.Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.Bias current for the comparator inputs is 300 nA(max) each,over the specified temperature range and will not introduce considerable error if the sum of the resistor values are kept to about 27 k as shown in the typical application of Figure1.This bias current of one comparator input will not flow if the temperature is well below the trip point level.