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The TC4404 and 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 pulldown sections, allowing the user to define the rates of rise and fall for a capacitive load; or a reduced output swing, if driving a resistive load, or to limit base current, when driving a bipolar transistor. Minimum rise and fall times, with no resistors, will be less than 30 nsec for a 1000-pF load. There is no upper limit.
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 TelCom 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, because they eliminate shoot-through currents in the output stage, require significantly less power at higher frequencies, and can be helpful in meeting low-power budgets.
Because neither drain in an output is dependent on the other, these devices can also be used as open-drain buffer/drivers where both drains are available in one device,
TC4405 Maximum Ratings
Supply Voltage ......................................................... +22V Maximum Chip Temperature................................... +150 Storage Temperature Range .................. 65to +150 Lead Temperature (Soldering, 10 sec) ................... +300 Package Thermal Resistance CerDIP RJ-A ................................................... 150/W CerDIP RqJ-C ................................................... 55/W PDIP RJ-A ...................................................... 125/W PDIP RJ-C ........................................................ 45/W SOIC RJ-A ..................................................... 155/W SOIC RJ-C ....................................................... 45/W Operating Temperature Range C Version .................................................. 0 to +70 E Version ............................................ 40 to +85 M Version .......................................... 55 to +125 Package Power Dissipation (TA 70) Plastic ................................................................730mW CerDP ................................................................800mW SOIC ..................................................................470mW
*Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.
TC4405 Features
` Independently-Programmable Rise and Fall Times ` Low Output Impedance ................................ 7 Typ ` High Speed tR, tF ....... <30 nsec with 1000 pF Load ` Short Delay Times ....................................< 30 nsec ` Wide Operating Range .......................... 4.5V to 18V `Latch-Up Protected ......... Will Withstand >500 mA Reverse Current (Either Polarity) ` Input Withstands Negative Swings Up to 5V
TC4405 Typical Application
· Motor Controls · Driving Bipolar Transistors · Driver for Nonoverlapping Totem Poles ·Reach-Up/Reach-Down Driver