28176 Parallax Inc, 28176 Datasheet - Page 58

• Manufacturer Part Number: 28176
• Description: KIT PARTS PROCESS CONTROL W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28176

• Accessory Type: Process Control
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

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