130-28176 Parallax Inc, 130-28176 Datasheet - Page 58
130-28176
Manufacturer Part Number
130-28176
Description
KIT PARTS PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 130-28176
Accessory Type
Education Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Board of Education Full Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Manufacturer data sheets provide guaranteed threshold voltage for a device. Legal HIGH
and LOW values are considered above and below these levels.
For the BASIC Stamp:
The BASIC Stamp has a very clear and repeatable threshold. Halfway between V
V
digital devices have the same thresholds. Additionally, some inputs may employ Schmitt
Triggers, or hysteresis, where threshold levels differ, depending on whether the voltage is
increasing or decreasing to change states. The concept of hysteresis will be explored
further in later chapters.
IL
is the 1.4 V TTL logic threshold at which the input will change sensed states. Not all
•
•
•
•
V
input.
V
input.
V
V
IH
IL
IH
IL
– Voltage In-Low: Voltage below which assured to be LOW on the
= 0.8 V
– Voltage In-High: Voltage above which assured to be HIGH on the
= 2.0 V
Figure 3-2
Logic Threshold
Voltage Plot
IH
and
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