TC4420M/TC4429M
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
Pin No.
8-Pin CERDIP
PIN FUNCTION TABLE
Symbol
Description
1
2
3
4
5
6
7
8
V
DD
INPUT
NC
GND
GND
OUTPUT
OUTPUT
V
DD
Supply input, 4.5V to 18V
Control input, TTL/CMOS compatible input
No Connection
Ground
Ground
CMOS push-pull output
CMOS push-pull output
Supply input, 4.5V to 18V
3.1
Supply Input (V
DD
)
3.3
CMOS Push-Pull Output
The V
DD
input is the bias supply for the MOSFET driver
and is rated for 4.5V to 18V with respect to the ground
pins. The V
DD
input should be bypassed to ground with
a local ceramic capacitor. The value of the capacitor
should be chosen based on the capacitive load that is
being driven. A minimum value of 1.0 µF is suggested.
The MOSFET driver output is a low-impedance,
CMOS, push-pull style output capable of driving a
capacitive load with 6.0A peak currents. The MOSFET
driver output is capable of withstanding 1.5A peak
reverse currents of either polarity.
3.4
3.2
Control Input
The MOSFET driver input is a high-impedance,
TTL/CMOS-compatible input. The input circuitry of the
TC4420M/TC4429M MOSFET driver also has a
“speed-up” capacitor. This helps to decrease the
propagation delay times of the driver. Because of this,
input signals with slow rising or falling edges should not
be used, as this can result in double-pulsing of the
MOSFET driver output.
Ground
The ground pins are the return path for the bias current
and the high peak currents that discharge the load
capacitor. The ground pins should be tied into a ground
plane or have very short traces to the bias supply
source return.
DS21933A-page 8
©
2005 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
