NXP Semiconductors
HEF4093B
Quad 2-input NAND Schmitt trigger
10
V
I
(V)
001aag112
V
T+
V
T−
5
0
2.5
5
7.5
10
12.5
15
V
DD
(V)
17.5
T
amb
= 25
C.
Fig 9.
Typical switching levels as a function of supply voltage
14. Application information
Some examples of applications for the HEF4093B are:
•
Wave and pulse shapers
•
Astable multivibrators
•
Monostable multivibrators
Cp
V
DD
14
1
3
V
DD
2
7
001aag113
R
V
DD
14
1
3
V
DD
2
C
7
001aag114
Fig 10. Astable multivibrator
Fig 11. Schmitt trigger driven via a
high-impedance input
If a Schmitt trigger is driven via a high-impedance (R > 1 k), then it is necessary to
C V
DD
–
V
SS
-
incorporate a capacitor C with a value of
------ > ------------------------
; otherwise oscillation can occur
C
P
V
H
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.
HEF4093B
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 8 — 21 November 2011
9 of 15
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