Datasheet

January 1995 6
Philips Semiconductors Product specification
Hex inverting Schmitt trigger
HEF40106B
gates
If a Schmitt trigger is driven via a high impedance (R > 1 kΩ) then it is necessary to incorporate a capacitor C of such
value that: , otherwise oscillation can occur on the edges of a pulse.
C
p
is the external parasitic capacitance between input and output; the value depends on the circuit board layout.
Fig.9 Typical switching levels as a function of supply voltage V
DD
;T
amb
=25°C.
Fig.10 Schmitt trigger driven via a high impedance (R > 1 kΩ).
C
C
p
-------
V
DD
V
SS
–
V
H
---------------------------
>