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LM393B Datasheet(PDF) 22 Page - Texas Instruments

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Part No. LM393B
Description  LM393B, LM2903B, LM193, LM293, LM393 and LM2903 Dual Comparators
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM393B Datasheet(HTML) 22 Page - Texas Instruments

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background image
VCC
Ground
6
5
7
1
2
3
4
8
Ground
PF
1IN-
1IN+
GND
2OUT
2IN-
2IN+
1OUT
VCC
OK
VCC or GND
Better
Input Resistors
Close to device
22
LM393B, LM2903B, LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V
SLCS005AC – OCTOBER 1979 – REVISED FEBRUARY 2020
www.ti.com
Product Folder Links: LM393B LM2903B LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V
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Copyright © 1979–2020, Texas Instruments Incorporated
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. 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.
Minimize coupling between outputs and inverting inputs to prevent output oscillations. Do not run output and
inverting input traces in parallel unless there is a VCC or GND trace between output and inverting input traces to
reduce coupling. When series resistance is added to inputs, place resistor close to the device.
10.2 Layout Example
Figure 42. LM2903 Layout Example


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