20-151-0178 Rabbit Semiconductor, 20-151-0178 Datasheet - Page 45

• Manufacturer Part Number: 20-151-0178
• Description: CABLE CONVERTER RS-232 TO USB
• Manufacturer: Rabbit Semiconductor

Specifications of 20-151-0178

• Accessory Type: USB to RS232 Adapter
• Product: Microcontroller Accessories
• For Use With/related Products: Rabbit-based Boards
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 20-151-0178; 316-1181

4.3.10.4 Contact Input
This section presents the circuit schematic and the characteristics for the contact input.
A contact input is designed to be connected to a switch. It has a longer time constant than the other digital
inputs to quiet the noise generated by a switch closure. And it already has the pullup allowing simple wir-
ing of the switch between the input and ground. Basically, it is a hardware switch debouncer, though it may
be still be neccesary to use software to fully debounce the switch.
RabbitFLEX User’s Manual
Note 1: (V
Note 2: at V
Note 3: at V
Note 4: Over Maximum Input Voltage range
Note 5: From PowerCore Supply5
Note 6: I
Note 7: Time delay from contact opening to see V
Note 8: Time delay from contact closing to see V
Symbol
V
V
V
I
V
I
V
I
I
t
t
QH
QL
I
Q
IH
IL
I1
I0
IW
IM
IH
IL
I
T
IH
= ((5 - V
IH
IL
+ V
IL
) / 2
IW
Working Input Voltage
Maximum Input Voltage
High Level Input Voltage
Low Level Input Voltage
Trigger Threshold Voltage
High Level Input Current
Low Level Input Current
Input Current
High Level Quiescent Current
Low Level Quiescent Current
Input Time Delay to 1
Input Time Delay to 0
) * 2.13) mA over Working Input Voltage Range
Parameter
Table 4-11. Contact Input Characteristics
Figure 4-14 Contact Input Circuit
W
IL
IH
W
at the cell output
at the cell output
2, 5, 6
3, 5, 6
Note
DC
AC
1
2
3
4
7
8
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Min
-0.5
-13
2.0
0
Typical
-6.4
-8.9
240
780
1.4
6.4
8.9
Max
10.5
0.8
13
5
cell v6.01
v1.03
Unit
mA
mA
mA
mA
mA
uS
uS
V
V
V
V
V
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