MIC4609 datasheet(18/34 Pages) MICROCHIP

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MIC4609

DS20005531A-page 18

 2016 Microchip Technology Inc.

4.4

Input Stage

The xHI and xLI pins are referenced to the COM pin

and have a CMOS/TTL compatible input range. The

input threshold voltage is independent of the

VDD supply. The input pin voltage must not exceed the

VDD pin voltage. The voltage state of the input signal(s)

does not change the quiescent current draw of the

driver. The input stage block diagram is shown in

Figure 4-2.

FIGURE 4-2:

Input Stage Block Diagram.

An internal pull-down resistor is connected to the

xHI and xLI pins. This pulls the driver output pins low if

the inputs are disconnected or left floating. A small

amount of hysteresis is programmed into the input to

prevent false triggering of the output. In addition, each

input has a minimum pulse-width filter for additional

noise immunity protection. The input pulse width must

exceed the tFLTR time before the outputs will change

state. Refer to the Electrical Characteristics table and

Figure 4-3 for additional information.

FIGURE 4-3:

Minimum Pulse-Width Diagram.

xHI/xLI

Min PW Filter

tPW1

tFLTR

tPW

tFLTR

tON

tOFF

xLI, xHI

xLO, xHO

tPW1

tFLTR

tPW

tON

tOFF

xLI, xHI

xLO, xHO

tPW

Input and output

pulse widths (tPW) are equal

tPW

tPW1 < tFLTR

tPW > tFLTR

tFLTR

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