MCP6566 Microchip Technology Inc., MCP6566 Datasheet - Page 16

• Manufacturer Part Number: MCP6566
• Description: 1.8v Low Power Open-drain Output Comparator
• Manufacturer: Microchip Technology Inc.

MCP6566/6R/7/9
A significant amount of current can flow out of the
inputs when the common mode voltage (V
ground (V
high impedance may need to limit the useable voltage
range.
4.1.3
The MCP6566/6R/7/9 comparator family uses CMOS
transistors at the input. They are designed to prevent
phase inversion when the input pins exceed the supply
voltages.
both supplies with no resulting phase inversion.
4.2
The open-drain output is designed to make level-shift-
ing and wired-OR logic easy to implement. The output
stage minimizes switching current (shoot-through
current from supply-to-supply) when the output
changes state. See Figures 2-15, 2-18,
for more information.
4.3
Greater flexibility in selecting hysteresis (or input trip
points) is achieved by using external resistors.
Hysteresis reduces output chattering when one input is
slowly moving past the other. It also helps in systems
where it is best not to cycle between high and low
states too frequently (e.g., air conditioner thermostatic
control). Output chatter also increases the dynamic
supply current.
4.3.1
Figure 4-4
supply applications using just two resistors. The
resulting hysteresis diagram is shown in
FIGURE 4-4:
Hysteresis for Single-Supply.
DS22143A-page 16
V
IN
V
Open-Drain Output
Externally Set Hysteresis
REF
Figure 2-3
SS
shows a non-inverting circuit for single-
PHASE REVERSAL
NON-INVERTING CIRCUIT
); see
R
1
Figure
shows an input voltage exceeding
Non-Inverting Circuit with
+
-
MCP656X
V
4-3. Applications that are
DD
R
F
V
PU
2-35
R
Figure
CM
PU
V
) is below
and 2-36,
OUT
4-5.
FIGURE 4-5:
Non-Inverting Circuit.
The trip points for Figures
EXAMPLE 4-1:
4.3.2
Figure 4-6
using three resistors. The resulting hysteresis diagram
is shown in
FIGURE 4-6:
Hysteresis.
V
V
V
V
OH
DD
OL
SS
V
V
SS
V
V
IN
V THL
V TLH
R
R
High-to-Low
V
TLH
THL
2
3
shows an inverting circuit for single-supply
V
OUT
INVERTING CIRCUIT
Figure
DD
= trip voltage from low-to-high
= trip voltage from high-to-low
=
=
V REF 1
V REF 1
4-7.
V
MCP656X
THL
Hysteresis Diagram for the
Inverting Circuit with
© 2009 Microchip Technology Inc.
V
⎛
⎜
⎝
⎛
⎜
⎝
DD
4-4
V
+
+
TLH
------ -
R F
------ -
R F
R 1
R 1
and
R
F
⎞
⎟
⎠
⎞
⎟
⎠
Low-to-High
–
–
V
4-5
V OH
V OL
PU
R
are:
PU
⎛
⎜
⎝
⎛
⎜
⎝
------ -
R F
V
R 1
------ -
R F
R 1
V
DD
OUT
⎞
⎟
⎠
⎞
⎟
⎠
V
IN