MCP6549 datasheet(13/44 Pages) MICROCHIP

13 / 44 page

DS21714G-page 13

MCP6546/6R/6U/7/8/9

3.0

PIN DESCRIPTIONS

Descriptions of the pins are listed in Table 3-1.

3.1

Analog Inputs

The comparator non-inverting and inverting inputs are

high-impedance CMOS inputs with low bias currents.

3.2

CS Digital Input

This is a CMOS, Schmitt-triggered input that places the

part into a low power mode of operation.

3.3

Digital Outputs

The comparator outputs are CMOS, open-drain digital

outputs. They are designed to make level shifting and

wired-OR easy to implement.

3.4

Power Supply (VSS and VDD)

The positive power supply pin (VDD) is 1.6V to 5.5V

higher than the negative power supply pin (VSS). For

normal operation, the other pins are at voltages

between VSS and VDD, except the output pins which

can be as high as 10V above VSS.

Typically, these parts are used in a single (positive)

supply configuration. In this case, VSS is connected to

ground and VDD is connected to the supply. VDD will

need a local bypass capacitor (typically 0.01 µF to

0.1µF) within 2mm of the VDD pin. These can share a

bulk capacitor with nearby analog parts (within

100 mm), but it is not required.

TABLE 3-1:

PIN FUNCTION TABLE

Symbol

Description

PDIP,

SOIC,

MSOP

SC-70,

SOT-23

SOT-23-5

SC-70,

SOT-23-5

PDIP,

SOIC,

MSOP

PDIP,

SOIC,

MSOP

PDIP,

SOIC,

TSSOP

OUT,

OUTA

Digital Output (comparator A)

VIN–,

VINA–

Inverting Input

(comparator A)

VIN+,

VINA+

Non-inverting Input

(comparator A)

VDD

Positive Power Supply

——

—

VINB+

Non-inverting Input

(comparator B)

——

—

VINB–

Inverting Input (comparator B)

—

OUTB

Digital Output (comparator B)

—

OUTC

Digital Output (comparator C)

——

—

VINC–

Inverting Input (comparator C)

——

—

VINC+

Non-inverting Input

(comparator C)

VSS

Negative Power Supply

——

—

VIND+

Non-inverting Input

(comparator D)

——

—

VIND–

Inverting Input (comparator D)

—

OUTD

Digital Output (comparator D)

——

—

Chip Select

1, 5, 8

—

1, 5

—

No Internal Connection

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