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MCP6544-I/ST Datasheet(PDF) 16 Page - Microchip Technology

Part # MCP6544-I/ST
Description  Push-Pull Output Sub-Microamp Comparators
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6544-I/ST Datasheet(HTML) 16 Page - Microchip Technology

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MCP6541/1R/1U/2/3/4
DS21696E-page 16
© 2006 Microchip Technology Inc.
4.4.2
INVERTING CIRCUIT
Figure 4-6 shows an inverting circuit for single-supply
using three resistors. The resulting hysteresis diagram
is shown in Figure 4-7.
FIGURE 4-6:
Inverting Circuit With
Hysteresis.
FIGURE 4-7:
Hysteresis Diagram for the
Inverting Circuit.
In order to determine the trip voltages (VTHL and VTLH)
for the circuit shown in Figure 4-6, R2 and R3 can be
simplified to the Thevenin equivalent circuit with
respect to VDD, as shown in Figure 4-8.
FIGURE 4-8:
Thevenin Equivalent Circuit.
Where:
Using this simplified circuit, the trip voltage can be
calculated using the following equation:
EQUATION 4-2:
Figure 2-20 and Figure 2-23 can be used to determine
typical values for VOH and VOL.
4.5
Bypass Capacitors
With this family of comparators, the power supply pin
(VDD for single supply) should have a local bypass
capacitor (i.e., 0.01 µF to 0.1 µF) within 2 mm for good
edge rate performance.
4.6
Capacitive Loads
Reasonable capacitive loads (e.g., logic gates) have
little impact on propagation delay (see Figure 2-31).
The supply current increases with increasing toggle
frequency
(Figure 2-19),
especially
with
higher
capacitive loads.
4.7
Battery Life
In order to maximize battery life in portable
applications, use large resistors and small capacitive
loads. Avoid toggling the output more than necessary.
Do not use Chip Select (CS) frequently to conserve
start-up power. Capacitive loads will draw additional
power at start-up.
VIN
VOUT
MCP654X
VDD
R2
RF
R3
VDD
VOUT
High-to-Low
Low-to-High
VDD
VOH
VOL
VSS
VSS
VDD
VTLH VTHL
VIN
V23
VOUT
MCP654X
VDD
R23
RF
+
-
VSS
R23
R2R3
R2 R3
+
------------------
=
V23
R3
R2 R3
+
------------------ V
DD
×
=
VTHL
VOH
R23
R23 RF
+
-----------------------
⎝⎠
⎜⎟
⎛⎞
V23
RF
R23 RF
+
----------------------
⎝⎠
⎛⎞
+
=
VTLH
VOL
R23
R23 RF
+
-----------------------
⎝⎠
⎜⎟
⎛⎞
V23
RF
R23 RF
+
----------------------
⎝⎠
⎛⎞
+
=
VTLH = trip voltage from low to high
VTHL = trip voltage from high to low


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