HEF4093B_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 12 July 2012 9 of 14
NXP Semiconductors
HEF4093B-Q100
Quad 2-input NAND Schmitt trigger
14. Application information
Some examples of applications for the HEF4093B-Q100 are:
• Wave and pulse shapers
• Astable multivibrators
• Monostable multivibrators
If a Schmitt trigger is driven via a high-impedance (R > 1 k), then it is necessary to
incorporate a capacitor C with a value of ; otherwise oscillation can occur
on the edges of a pulse.
C
p
is the external parasitic capacitance between inputs and output; the value depends on
the circuit board layout.
Remark: The two inputs may be connected together, but this will result in a larger
through-current at the moment of switching.
T
amb
= 25 C.
Fig 9. Typical switching levels as a function of supply voltage
V
DD
(V)
2.5 17.512.57.551510
001aag112
5
10
V
I
(V)
0
V
T+
V
T−
Fig 10. Astable multivibrator Fig 11. Schmitt trigger driven via a
high-impedance input
001aag113
V
DD
V
DD
1
2
3
7
14
C
p
R
C
001aag114
V
DD
V
DD
1
2
3
7
14
C
C
P
------
V
DD
V
SS
–
V
H
------------------------->
