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LM293ADT-LM293ST-LM393ADT-LM393ST
LOW POWER DUAL BIPOLAR COMPARATORS
Wide single supply voltage range or dual supplies : +2V to +36V or ±1V to ±18V Very low supply current (0.4mA)
independent of supply voltage (1mW/
comparator at +5V) Low input bias current: 25nA typ. Low input offset current: ±5nA typ. Low input offset voltage: ±1mV typ. Input common-mode voltage range
includes ground Low output saturation voltage: 250mV typ.
(Io = 4mA) Differential input voltage range equal to the
supply voltage TTL, DTL, ECL, MOS, CMOS compatible
outputs
DescriptionThese devices consist of two independent low
voltage comparators designed specifically to
operate from a single supply over a wide range of
voltages. Operation from split power supplies is
also possible.
These comparators also have a unique
characteristic in that the input common-mode
voltage range includes ground even though
operated from a single power supply voltage.
Pin Connections (top view)
Order Code
LM193, A
LM293, A - LM393, ALow Power Dual Voltage Comparators
LM193, A - LM293, A - LM393, A Schematic Diagram (1/2 LM193)
1 Schematic Diagram (1/2 LM193)
Absolute Maximum Ratings LM193, A - LM293, A - LM393, A Absolute Maximum Ratings
Table1. Key parameters and their absolute maximum ratings Short-circuits from the output to VCC+ can cause excessive heating and eventual destruction. The maximum output current is approxi-
mately 20mA independent of the magnitude of VCC+. Pd is calculated with Tamb = +25°C, Tj = +150°C and Rthja = 100°C/W for DIP8 package = 175°C/W for SO8 package = 200°C/W for TSSOP8 package = 215°C/W for Mini SO8 package
Table2. Operating Conditions
LM193, A - LM293, A - LM393, A Electrical Characteristics
3 Electrical Characteristics
Table3. VCC+ = +5V, VCC- = 0V, T amb = +25°C (unless otherwise specified) At output switch point, Vo ≈ 1.4V, Rs = 0 with VCC+ from 5V to 30V, and over the full common-mode range (0V to VCC+ -1.5V). The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant, independent of the state
of the output, so no loading charge exists on the reference of input lines. The input common-mode voltage of either input signal voltage should not be allowed to go negative by more than 0.3V. The upper end
of the common-mode voltage range is VCC+ -1.5V, but either or both inputs can go to +30V without damage. The response time specified is for a 100mV input step with 5mV overdrive. For larger overdrive signals 300ns can be obtained. Posistive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the common-mode
range, the comparator will provide a proper output state. The low input voltage state must not be less than -0.3V (or 0.3V bellow the neg-
ative power supply, if used).
Electrical Characteristics LM193, A - LM293, A - LM393, A
Figure 1. Supply current vs. supply voltage
Figure 2. Output saturation voltage vs.
output current
Figure 3. Response time for various input
overdrives - positive transition
Figure 4. Input current vs. supply voltage
Figure 5. Response time for various input
overdrives - negative transition
LM193, A - LM293, A - LM393, A Typical Applications
4 Typical Applications
Figure 6. Basic comparator Figure 7. driving TTL
Figure 8. Low frequency op-amp Figure 9. Driving CMOS
Figure 10. Low frequency op-amp Figure 11. Transducer amplifier
Typical Applications LM193, A - LM293, A - LM393, A
Figure 12. Low frequency op-amp with offset
adjust
Figure 13. Zero crossing detector (single power
supply)
Figure 14. Two-decade high-frequency VCO
Figure 15. Limit comparator Figure 16. Crystal controlled oscillator
