SN74AS645DW

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The SN74AS645DW is a high-speed, 8-bit, low-voltage, BiCMOS driver that can interface between standard TTL- or 5-V CMOS-logic levels and high-power loads, such as relays and motors. This device can be used to drive up to four outputs. Here we will discuss SN74AS645DW’s application field and working principle.

Application Field of SN74AS645DW

The SN74AS645DW is suitable for logic buffer, driver, receiver and transceiver applications. It is designed to drive high-voltage and/or large-capacitance loads. It can operate with supply voltages ranging from 2.7 V to 5.5 V for VCC, and 4.5 V to 5.5 V for VCC2. This device can be used to drive relays, bipolar stepper motors and solenoids. It is capable of driving several open-drain outputs simultaneously and is ideal for logic buffer, driver, receiver and transceiver applications. Its logic-level input and output pins are compatible with both TTL and 5-V CMOS logic.

Working Principle of SN74AS645DW

The SN74AS645DW is a high-speed 8-bit low-voltage BiCMOS driver. The SN74AS645DW is capable of driving four outputs simultaneously. All outputs are open-drain, with the voltage being pulled to either VCC or ground, depending on the logic state of the output. The logic-level input and output of the SN74AS645DW are compatible with both TTL and 5-V CMOS logic. The output pins can be disabled by using the enable pins. The enable pins can be connected to either a logic low (for a disabled output) or to a logic high (for an enabled output). The outputs can be disabled individually, or the entire device can be disabled by setting the enable pins to a logic low. Furthermore, the device can be programmed to drive either dumb-line loads or LEDs by changing the output current setting resistors.

In addition to the logic-level inputs and outputs, the SN74AS645DW also has a dedicated VCC2 pin. VCC2 provides an independent supply voltage for the output stage, allowing the SN74AS645DW to drive high-voltage, large-capacitance loads, such as relays and motors. The VCC2 pin is connected to an onboard charge-pump circuit that is used to generate the required output voltage. The charge-pump circuit also provides noise immunity and eliminates the need for additional power-supply regulation.

The SN74AS645DW is a versatile device that can be used in a wide range of applications. It is capable of driving both low- and high-voltage loads, and can be used for both logic buffering and driver applications. Its ability to interface between standard TTL- or 5-V CMOS logic levels and high-power loads makes it an ideal solution for driving relays and motors.

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