1OUT

1

1INí

2

1IN+

3

GND

4

8

7

2OUT

6

2INí

5

2IN+

0.12F

Ground

Bypass

Capacitor

Negative Supply or Ground

Positive Supply

0.12F

Ground

Only needed

for dual power

supplies

LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V

SLCS005Y – OCTOBER 1979 – REVISED JUNE 2015

www.ti.com

9 Power Supply Recommendations

For fast response and comparison applications with noisy or AC inputs, TI recommends to use a bypass

capacitor on the supply pin to reject any variation on the supply voltage. This variation can eat into the input

common-mode range of the comparator and create an inaccurate comparison.

10 Layout

10.1 Layout Guidelines

For accurate comparator applications without hysteresis it is important maintain a stable power supply with

minimized noise and glitches, which can affect the high level input common-mode voltage range. In order to

achieve this, it is best to add a bypass capacitor between the supply voltage and ground. This should be

implemented on the positive power supply and negative supply (if available). If a negative supply is not being

used, do not put a capacitor between the IC's GND pin and system ground.

10.2 Layout Example

Figure 10. LM2903 Layout Example

12

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