MCP6561-E/MC Microchip Technology, MCP6561-E/MC Datasheet - Page 15

• Manufacturer Part Number: MCP6561-E/MC
• Description: Comparator ICs SNGL 18V Push/Pull Comparator E temp
• Manufacturer: Microchip Technology

Specifications of MCP6561-E/MC

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.0
The MCP6561/1R/2/4 family of push-pull output
comparators are fabricated on Microchip’s state-of-the-
art CMOS process. They are suitable for a wide range
of high speed applications requiring low power
consumption.
4.1
4.1.1
The input stage of this family of devices uses three
differential input stages in parallel: one operates at low
input voltages, one at high input voltages, and one at
mid input voltage. With this topology, the input voltage
range is 0.3V above V
providing low offset voltage through out the common
mode range. The input offset voltage is measured at
both V
operation.
The
hysteresis
offset accuracy and large enough to eliminate output
chattering caused by the comparator’s own input noise
voltage
set voltage (V
referred) low-high and high-low trip points. Input
hysteresis voltage (V
the same trip points.
FIGURE 4-1:
comparators’ internal hysteresis eliminates
output chatter caused by input noise voltage.
4.1.2
The ESD protection on the inputs can be depicted as
shown in
protect the input transistors, and to minimize input bias
current (IB). The input ESD diodes clamp the inputs
when they try to go more than one diode drop below
V
above V
allow normal operation, and low enough to bypass ESD
events within the specified limits.
© 2009 Microchip Technology Inc.
SS
. They also clamp any voltages that go too far
-1
-2
-3
8
7
6
5
4
3
2
1
0
MCP6561/1R/2/4
SS
E
DD
V
APPLICATIONS INFORMATION
Comparator Inputs
NI
DD
- 0.3V and V
V
Figure
.
; their breakdown voltage is high enough to
NORMAL OPERATION
INPUT VOLTAGE AND CURRENT
LIMITS
HYST
= 5.0V
Figure 4-1
V
OUT
OS
) is the center (average) of the (input-
that is small enough to maintain input
4-1. This structure was chosen to
Time (100 ms/div)
HYST
The MCP6561/1R/2/4
DD
depicts this behavior. Input off-
DD
) is the difference between
family
and 0.3V below V
+ 0.3V to ensure proper
Hysteresis
V
IN
–
has
internally-set
SS
, while
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
FIGURE 4-2:
Structures.
In order to prevent damage and/or improper operation
of these amplifiers, the circuits they are in must limit the
currents (and voltages) at the V
Maximum Ratings* at the beginning of Section 1.0
“Electrical Characteristics”).
recommended approach to protecting these inputs.
The internal ESD diodes prevent the input pins (V
and V
resistors R
of the input pin. Diodes D
(V
implemented as shown, resistors R
the current through D
FIGURE 4-3:
Inputs.
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
IN
IN
–) should be very small.
+ and V
V
V
V
V
V
IN
IN
1
DD
2
SS
+
–) from going too far below ground, and the
R
R
1
1
1
2
Bond
Bond
Bond
Pad
Pad
Pad
MCP6561/1R/2/4
and R
IN
≥
and R
1
R
≥
R
–) from going too far above V
1
and D
2
D
V
V
1
SS
SS
2
D
2
– (minimum expected V
– (minimum expected V
limit the possible current drawn out
. In this case, the currents through
2
2
1
need to be limited by some other
Simplified Analog Input ESD
Protecting the Analog
and D
Stage
Input
1
and D
2 mA
2 mA
MCP656X
+
–
2
R
.
V
3
IN
Figure 4-1
DD
2
+ and V
prevent the input pin
1
DS22139A-page 15
Bond
and R
Pad
IN
2
1
– pins (see
shows the
2
)
V
)
DD
V
also limit
OUT
IN
IN
. When
+ and
–
IN
+