MCP65R46T datasheet(24/36 Pages) MICROCHIP

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MCP65R41/6

DS20002269C-page 24

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To determine the trip voltages (VTLH and VTHL) for the

circuit shown in Figure 4-6, R2 and R3 can be simplified

to the Thevenin equivalent circuit with respect to VREF,

as shown in Figure 4-8:

FIGURE 4-8:

Thevenin Equivalent Circuit.

By using this simplified circuit, the trip voltage can be

calculated using the following equation:

EQUATION 4-1:

Figures 2-25 and 2-28 can be used to determine the

typical values for VOH and VOL.

4.4

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.

4.5

Capacitive Loads

4.5.1

OUT PIN

Reasonable capacitive loads (i.e., logic gates) have lit-

tle impact on the propagation delay (see Figure 2-34).

The supply current increases with the increasing toggle

frequency (Figure 2-22), especially with higher capaci-

tive loads. The output slew rate and propagation delay

performance will be reduced with higher capacitive

loads.

4.5.2

VREF PIN

The reference output is designed to interface to the

comparator input pins, either directly or with some

resistive network (e.g., a voltage divider network) with

minimal capacitive load. The recommended capacitive

load is 200 pF (typical). Capacitive loads greater than

2000 pF may cause the VREF output to oscillate at

power up.

V23

VOUT

VDD

R23

VSS

VPU

RPU*

* Pull-up resistor required for the MCP65R46 only.

Where:

R23

R2R3

R2 R3

-------------------

V23

R2 R3

------------------- VREF



VTHL

VOH

R23

R23 RF

-----------------------







V23

R23 RF

----------------------





VTLH

VOL

R23

R23 RF

-----------------------







V23

R23 RF

----------------------





Where:

VTLH = trip voltage from low to high

VTHL = trip voltage from high to low

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