MICROCHIP TC4404COA

The TC4404/TC4405 are CMOS buffer-drivers constructed with complementary MOS outputs, where the drains of the totem-pole output have been left separated so that individual connections can be made to the pull-up and pull-down sections of the output. This allows the insertion of drain-current-limiting resistors in the pull-up and/or pull-down sections, allowing the user to define the rates of rise and fall for a capacitive load. It also enables a reduced output swing, if driving a resistive load, or limiting base current when driving a bipolar transistor. Minimum rise and fall times, with no resistors, will be less than 30 ns for a 1000 pF load.

For driving MOSFETs in motor-control applications, where slow-ON/fast-OFF operation is desired, these devices are superior to the previously used technique of adding a diode-resistor combination between the driver output and the MOSFET, because they allow accurate control of turn-on, while maintaining fast turn-off and maximum noise immunity for an OFF device.

When used to drive bipolar transistors, these drivers maintain the high speeds common to other Microchip drivers. They allow insertion of a base current-limiting resistor, while providing a separate half-output for fast turn-off. By proper positioning of the resistor, either NPN or PNP transistors can be driven.

For driving many loads in low-power regimes, these drivers require significantly less power at higher frequencies and can be helpful in meeting low-power budgets as they eliminate shoot-through currents in the output stage.

These devices are built to operate in the most demanding electrical environments. They will not latch-up under any conditions within their power and voltage ratings; they are not subject to damage when up to 5V of noise spiking of either polarity occurs on their ground pin; and they can accept, without damage or logic upset, up to 0.5A of reverse current (of either polarity) being forced back into their outputs. All terminals are fully protected against up to 2 kV (HBM) of electrostatic discharge.

• Independently Programmable Rise and Fall Times
• Low Output Impedance: 7Ω Typical
• High Speed tR, tF: < 30 ns with 1000 pF Load
• Short Delay Times: < 30 ns
• Wide Operating Range: 4.5V to 18V
• Latch-Up Protected: withstands > 500 mA Reverse Current (Either Polarity)
• Input Withstands Negative Swings up to -5V

• Motor Controls
• Driving Bipolar Transistors
• Driver for Non-Overlapping Totem Poles
• Reach-Up/Reach-Down Driver