TC4423M datasheet(9/18 Pages) MICROCHIP

9 / 18 page

DS21937A-page 9

TC4423M/TC4424M/TC4425M

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Input A (IN A)

IN A is a TTL/CMOS-compatible input that controls

OUT A. This input has 300 mV of hysteresis between

the high and low input levels that allows it to be driven

from slow rising and falling signals, as well as providing

noise immunity.

3.2

Input B (IN B)

IN B is a TTL/CMOS-compatible input that controls

OUT B. This input has 300 mV of hysteresis between

the high and low input levels that allows it to be driven

from slow rising and falling signals, as well as providing

noise immunity.

3.3

Output B (OUT B)

OUT B is a CMOS push-pull output that is capable of

sourcing and sinking 3A peaks of current (VDD = 18V).

The low output impedance ensures the gate of the

external MOSFET will stay in the intended state even

during large transients. This output also has a reverse

current latch-up rating of 1.5A.

3.4

Output A (OUT A)

OUT A is a CMOS, push-pull output that is capable of

sourcing and sinking 3A peaks of current (VDD = 18V).

The low output impedance ensures the gate of the

external MOSFET will stay in the intended state even

during large transients. This output also has a reverse

current latch-up rating of 1.5A.

3.5

Supply Input (VDD)

VDD is the bias supply input for the MOSFET driver and

has a voltage range of 4.5V to 18V. This input must be

decoupled to ground with a local ceramic capacitor.

This bypass capacitor provides a localized low-

impedance path for the peak currents that are to be

provided to the load.

3.6

Ground (GND)

GND is the device return pin. The ground pin(s) should

have a low-impedance connection to the bias supply

source return. High peak currents will flow out the

ground pin(s) when the capacitive load is being

discharged.

8-Pin

CERDIP

Symbol

Description

No connection

IN A

Input A

GND

Ground

IN B

Input B

OUT B

Output B

6VDD

Supply input

OUT A

Output A

No connection

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