LM393 Dual Differential Comparator DUAL DIFFERENTIAL COMPARATORS The LM393 dual differential comparator is made up of two voltage comparators that operate using the same power supply. THe supply voltage can range from 2 to 36 volts. Dual supplies can also be used as long as the difference between them is 2 to 36 volts. The LM393 is designed to operate at a temperature range of 0oC to 70oC. FEATURES PIN ARRANGEMENT l l l l l l l 8 DIP LM393CD Single or dual supplies 2 to 36 V Supply Low Input Bias Current Low Input Offset Voltage Low Input Offset Current Low Supply Current Drain Output Compatible with TTL, MOS, and CMOS 8 SOP LM393CS ABSOLUTE MAXIMUM RATINGS Item Power Supply Voltage Symbol VCC Rating +36 or +18 Unit V Input Differential Voltage Range VIDR 36 V Input Common Mode Voltage Range VICR -0.3 to +36 V Output Short Circuit-to-Ground Output Sink Current (1) ISC ISink Continuous 20 mA PD 1/RθJA 570 5.7 mW mW/oC TA 0 to 70 o C 125 o C -65 to 150 o C Power Dissipation @ 25oC Derate above 25oC Operating Ambient Temperature Range Operating Junction Temperature Storage Temperature Range TJ TS Notes: 1. The max. output current may be as high as 20 mA, independent of the magnitude of VCC , output short circuits to VCC can cause excessive heating and eventual destruction. 2. At output switch point, V O = 1.4 Vdc, RS = 0 Ω with VCC from 5.0 Vdc to 30 Vdc, and over the full input common mode range (0V to VCC = –1.5V). 3. Due to the PNP transistor inputs, bias current will flow out of the inputs. This current is essentially constant, independent of the output state, therefore, no loading changes will exist on the input lines. 4. Input common mode of either input should not be permitted to go more than 0.3V negative of ground or minus supply. The upper limit of common mode range is VCC –1.5V. 5. Response time is specified with a 100mV step and 5.0mV of overdrive. With larger magnitudes of overdrive faster response times are obtainable. 6. The comparator will exhibit proper output state if one of the inputs becomes greater than V CC , the other input must remain within the common mode range. The low input state must not be less than –0.3V of ground or minus supply. 5-16 LM393 Dual Differential Comparator ELECTRICAL CHARACTERISTICS VCC = 5.0Vdc, 0oC < TA < 70oC (unless otherwise noted) 8 8 Item Symbol Input Offset Voltage (2) VIO TA = 25oC 0oC < TA < 70oC Input Offset Current IIO TA = 25oC 0oC < TA < 70oC Input Offset Current (3) IIB TA = 25oC 0oC < TA < 70oC Input Common Mode Voltage Range (3) VICR TA = 25oC 0oC < TA < 70oC Voltage Gain AVOL RL > 15K, VCC = 15 Vdc TA = 25oC Large Signal Response Time --Vin = TTL Logic Swing. Vref = 1.4 Vdc VRL = 5.0 Vdc, RL = 5.1K TA = 25oC Response Time (5) tTLH VRL = 5.0 Vdc, RL = 5.1K TA = 25oC Input Differential Voltage (6) VID All Vin > GND or V-Supply (if used) Output Sink Current ISink Vin- > 1.0 Vdc, Vin+ = 0 Vdc Vo < 1.5 Vdc, TA = 25oC Output Saturation Voltage VOL Vin- > 1.0 Vdc, Vin+ = 0 Vdc ISink < 4.0 mA, TA = 25oC o 0 C < TA < 70oC Output Leakage Current IOL Vin- = 0 Vdc, Vin+ > 1.0 Vdc Vo = 5.0 Vdc, TA = 25oC Vin- = 0 Vdc, Vin+ > 1.0 Vdc Vo = 30 Vdc, 0oC < TA < 70oC Supply Current LCC RL = , TA = 25oC RL = , VCC = 30 V Min Typ Max Unit mV ----- 1.0 --- 5.0 9.0 ----- 5.0 --- 50 150 ----- 25 --- 250 400 0 0 50 ----200 --- 300 --- ns --- 13 --- µs --- --- VCC V 6.0 16 --- mA --- 150 400 --- --- 700 --- 0.1 --- --- --- 1000 ----- 0.4 --- 1.0 2.5 nA nA V VCC-1.5 VCC-2.0 --V/mV mV nA mA LM393 Dual Differential Comparator Input Bias Current (nA) Satuuration Voltage (Vdc) CIRCUIT SCHEMATIC (Diagram shown is for 1 comparator) Supply Voltage (Vdc) Supply Current (mA) Output Sink Current (mA) Supply Voltage (Vdc) 5-18 LM393 Dual Differential Comparator APPLICATIONS INFORMATION These dual comparators feature high gain, wide bandwidth characteristics. This gives the device oscillation tendencies if the outputs are capacitively coupled to the inputs via stray capacitance. This oscillation manifests itself during output transitions (VOL to VOH ). To alleviate this situation, input resistors <10 kΩ should be used. The addition of positive feedback (< 10 mV) is also recommended. It is good design practice to ground all unused pins. Differential input voltages may be larger than supply voltage without damaging the comparator’s inputs. Voltages more negative than –0.3 V should not be used. Zero Crossing Detector (Single Supply) Zero Crossing Detector (Split Supply) Time Delay Generator Free-Running Square Wave Oscillator Comparator With Hysteresis 5-19