74ABT240PW,118

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The 74ABT240PW is an integrated logic circuit belonging to the family of logic buffers, drivers, receivers, and transceivers. Manufactured by ON Semiconductor, the device is a 4-channel 3-state noninverting buffer. It is constructed using advanced CMOS technology that allows it to provide low power dissipation with high speed performance and low noise operation.

The 74ABT240PW has four independent noninverting 3-state buffers with output enable which includes active HIGH and active LOW capability. It has a high output current capability of 24mA with minimum supply voltage of 4.5V and maximum of 5.5V. The internal circuit is designed to ensure low power dissipation and high noise immunity.

Its operational temperature ranges from 0 to 70°C for the commercial grade device and -40 to 85°C for the industrial grades. It is available in a 28-pin narrow 300mil PDIP (Plastic Dual-In-line Package).

Application Field

The 74ABT240PW has a wide range of applications which includes interfacing with high performance microprocessors, memory, and peripheral systems. It can be used in multiplexer/demultiplexer, data selector and other applications where noninverting buffer or bus isolation and operation at high speeds are required. Additional application fields include bus registered operation and general purpose switching operations in digital video and audio systems.

Working Principle

The 74ABT240PW has 4 logical channels referred to as A, B, C, and D. The channels are organized such that a signal applied to input pins A1, B1, C1 and D1 will be put out on corresponding output pins A2, B2, C2, and D2 respectively when the output enable (OE) is driven LOW. The OE acts as an enable pin which is used to turn the output buffer of each channel ON and OFF. The OE pin can also be used as an active LOW enable with OE pin pulled to a HIGH level.

The BUFFER/BUS DRIVER enables direct transmission of data with the 74ABT240PW output buffers. With this feature, all four channels can be connected in a four-wire system, such as the Case A configuration. The Case A configuration allows all four channels to be connected to the same bus line (A2 to A1, B2 to B1, C2 to C1, D2 to D1). This configuration is used to drive bus lines which can be weak due to ground noise or inappropriate load.

In addition, a 5V power supply (Vcc) is necessary for proper operation of the device. Internal current limiting, thermal shutdown capability and guard ring on the die make the 74ABT240PW reliable under different working conditions and prevent temperature rise caused by over-current or by electrostatic discharge.

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