Programming instructions

TIL Components
 National Instruments Corporation 9-7 Multisim Component Reference Guide
Truth table:
Note When using a buffer, set it up using the Models tab of the Circuit/Component
Properties dialog box. Select the LS-BUF or LS-OC-BUF model if the buffer is being
used as a TTL device. Select HC-BUF or HC-OD-BUF if the buffer is being used as a
CMOS device. Otherwise, by default, the buffer will behave as a regular digital device
without any high-current capabilities.
9.1.10 Schmitt Trigger
This component is a type of comparator with hystereses that produces uniform-amplitude
output pulses from a random-amplitude input signal. It has applications in pulse systems, for
example, converting a sine wave into a square wave.
Characteristic Operation:
The Schmitt trigger outputs:
where:
V
+g
+
= 1.6 V (V
ih
)
V
+g
-
= 0.9 V (V
il
)
input output
11
00
0 if the voltage is rising and V
in
> V
+g
+
1 if the voltage is falling and V
in
< V
+g
-
ComponentRef.book Page 7 Thursday, December 7, 2006 10:12 AM