LM193/LM293/LM393/LM2903

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LM193/LM293/LM393/LM2903

Low Power Low Offset Voltage Dual Comparators

General Description

The Lm193 series consists of two independent precision voltage

comparators with an offset voltage specification as low as 2.0

mV max for two comparators which were designed specifically

to operate from a single power supply over a wide range of

voltages. Operation from split power supplies is also possible

and the low power supply current drain is independent of the

magnitude of the power supply voltage. These comparators also

have a unique characteristic in that input common-mode voltage

range includes ground, even though operated from a single

power supply voltage.

Application areas include limit comparators, simple analog to

digital converters; pulse, squarewave and time delay generators;

wide range VCO; MOS clock timers; multivibrators and high

voltage digital logic gates. The LM193 series was designed to

directly interface with TTL and CMOS. When operated from both

plus and minus power supplies, the LM193 series will directly

interface with MOS logic where their low power drain is a distinct

advantage over standard comparators

The LM393 and LM2903 parts are available in National’s

innovative thin micro SMD package with 8 (12 mil) large bumps.

Advantages

High precision comparators

Reduced VOS drift over temperature

Eliminates need for dual supplies

Allows sensing near ground

Compatible with all forms of logic

Power drain suitable for battery operation

Features

Wide supply

—Voltage range:

2.0V to 36V

—Single or dual supplies:

±1.0V to ±18V

Very low supply current drain (0.4mA) — independent of

supply voltage

Low input biasing current:

25nA

Low input offset current:

±5nA

Maximum offset voltage:

±3mV

Input common-mode voltage range includes ground

Differential input voltage range equal to the power supply

voltage

Low output saturation voltage:

250mV at 4 mA

Output voltage compatible with TTL, DTL, ECL, MOS and

CMOS logic systems

Available in the 8-Bump (12 mil) micro SMD package

See AN-1112 for micro SMD considerations

Squarewave Oscillator

00570938

Non-Inverting Comparator with Hysteresis

00570909