MCP6569 Microchip Technology, MCP6569 Datasheet - Page 18

• Manufacturer Part Number: MCP6569
• Description: (MCP6566 - MCP6569) 1.8V Low Power Open-Drain Output Comparator
• Manufacturer: Microchip Technology

www.DataSheet4U.com
MCP6566/6R/6U/7/9
It is also possible to connect the diodes to the left of the
resistors R
the diodes D
mechanism. The resistor then serves as in-rush current
limiter; the DC current into the input pins (V
V
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/6U/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.
exceeding 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
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.
DS22143B-page 18
IN
–) should be very small.
Open-Drain Output
Externally Set Hysteresis
SS
1
PHASE REVERSAL
and R
1
); see
and D
2
Figures
. In this case, the currents through
2
Figure
Figure 2-3
need to be limited by some other
4-3. Applications that are
2-15, 2-18,
shows an input voltage
2-35
CM
) is below
and 2-36,
IN
+ and
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.
FIGURE 4-5:
Non-Inverting Circuit.
The trip points for
EQUATION 4-1:
Where:
V
V
V
V
OH
V
DD
OL
SS
V
V
IN
V
TLH
THL
SS
V
V THL
V TLH
REF
High-to-Low
V
OUT
shows a non-inverting circuit for single-
NON-INVERTING CIRCUIT
=
=
R
=
=
1
Figures 4-4
V REF 1
V REF 1
trip voltage from low-to-high
trip voltage from high-to-low
V
THL
Non-Inverting Circuit with
Hysteresis Diagram for the
MCP656X
© 2009 Microchip Technology Inc.
+
-
⎛
⎜
⎝
⎛
⎜
⎝
V
+
V
+
TLH
DD
------ -
R F
------ -
R F
R 1
R 1
and
⎞
⎟
⎠
⎞
⎟
⎠
Low-to-High
R
–
–
F
4-5
V OH
V OL
V
PU
are:
⎛
⎜
⎝
⎛
⎜
⎝
Figure
R
------ -
R F
V
R 1
------ -
R F
R 1
PU
DD
⎞
⎟
⎠
⎞
⎟
⎠
V
OUT
4-5.
V
IN