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HEF4093B Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. HEF4093B
Description  Quadruple 2-input NAND Schmitt trigger
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

   
 6 page
background image
January 1995
6
Philips Semiconductors
Product specification
Quadruple 2-input NAND Schmitt trigger
HEF4093B
gates
Fig.9 Typical switching levels as a function of supply voltage VDD;Tamb =25 °C.
APPLICATION INFORMATION
Some examples of applications for the HEF4093B are:
• Wave and pulse shapers
• Astable multivibrators
• Monostable multivibrators.
Fig.10 The HEF4093B used as a astable multivibrator.
Fig.11 Schmitt trigger driven via a high impedance
(R
> 1kΩ).
If a Schmitt trigger is driven via a high impedance (R > 1 k
Ω) then it is necessary to incorporate a capacitor C of such
value that:
Cp is the external parasitic capacitance between inputs and output; the value depends on the circuit board layout.
Note
The two inputs may be connected together, but this will result in a larger through-current at the moment of switching.
C
C
p
-------
V
DD
V
SS
V
H
---------------------------
, otherwise oscillation can occur on the edges of a pulse.
>




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