© 2005 Microchip Technology Inc.

DS21939A-page 7

TC4426AM/TC4427AM/TC4428AM

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Inputs A & B (IN A and IN B)

MOSFET driver IN A & B are high-impedance,

TTL/CMOS-compatible inputs. These inputs also have

300 mV of hysteresis between the high and low

thresholds, which prevents output glitching even when

the rise and fall time of the input signal is very slow.

3.2

Ground (GND)

The GND pin is the return path for both the bias current

and the high peak current that discharges the external

load capacitance. The ground pin should be tied into a

ground plane or have a very short trace to the bias sup-

ply source return.

3.3

Outputs A & B (OUT A and OUT B)

MOSFET driver OUT A & B are low-impedance,

CMOS, push-pull style outputs. The pull-down and pull-

up devices are of equal strength, making the rise and

fall times equivalent.

3.4

and is rated for 4.5V to 18V, with respect to the ground

ceramic capacitors. The value of these capacitors

should be chosen based on the capacitive load that is

being driven.

8-Pin

CERDIP

Symbol

Description

1

NC

No connection

2

IN A

Input A

3

GND

Ground

4

IN B

Input B

5

OUT B

Output B

Supply input

7

OUT A

Output A

8

NC

No connection