DM74AS244SJX

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DM74AS244SJX Application Field and Working Principle

The DM74AS244SJX is a high-performance quad bus transceiver. It belongs to the logic family of “Buffers, Drivers, Receivers, Transceivers”. It is suitable for asynchronous communication between two buses. Its goods can be applied various electronic systems with different voltages. Moreover, it operates as a non-inverting four-line-to-four-line buffer. This transceiver uses a separate output-enable (OE) input to disable both A and B ports. When the output-enable is high level, A and B ports can be operated respectively. It is a low-power device and provides high noise margin performance for single 5V supplies.

Features

• Uses a separate output enable (OE) input to disable both A and B ports
• Provides high-drive current outputs (24mA)
• Guaranteed processing speed performance
• Wide power supply range (3.0V to 10V)
• Low power consumption

Application Field

The DM74AS244SJX is suitable for general digital systems. It can be applied to asynchronous communication between two buses. Especially, it is great for different low-voltage systems. Moreover, this quad bus transceiver can be used in a variety of electronic systems, from computers and peripherals to communication infrastructure systems. It also can be used in the audio-visual, consumer electronic and automotive industries.

Pin Configuration

The DM74AS244SJX has 24 pins and the pin configuration is as follows: Input A1, A2, A3, A4, B1, B2, B3, B4, Output A1, A2, A3, A4, B1, B2, B3, B4, GND, 5V,,VEN, OE, a, b, c and d. Input A1, A2, A3, A4, B1, B2, B3 and B4 are the data input pins. Output A1, A2, A3, A4, B1, B2, B3 and B4 are the data output pins. GND and 5V are the power supply pins. VEN is the voltage enable pin. OE is the output enable pin. a, b, c and d are the control input pins.

Working Principles

The DM74AS244SJX device features four buses for two-way data transfer. The four data lines A1, A2, A3, and A4 and B1, B2, B3, and B4 provide two-way data transfer between two sets of busses. The OE (Output Enable) pin is used to disable the inputs, conveniently allowing it to turn on and off the outputs. When OE is at high level, both A and B buses are enabled. When OE is at low level, both A and B buses are disabled. The data on the A and B buses is transferred from the input side to the output side. The DM74AS244SJX can also be used in asynchronous applications when two buses need to be switched.

The Voltage Enable (VEN) pin controls the power supply for the device. When the VEN pin is at logic 1, then power supply is applied and device is enabled. When VEN is at logic 0, then power supply is disconnected and device is logic 0. Thus the VEN pin can be used to turn the device on and off.

The DM74AS244SJX also has a power-on reset feature. When the power is applied, the device is reset to a low logic state. The DM74AS244SJX has an active-low reset output, which is different from the active-high reset output of other transceivers.

The DM74AS244SJX is designed to meet the needs of high-speed operations. It can provide 24 mA driving current at 3.0V to 10V power supply. It uses a low-power Schottky technology, which can reduce the power consumption of the device significantly. It can also provide high noise immunity performance for single 5V supplies. And the guaranteed processing speed performance can ensure the stability of the logic devices when operated with high frequency.

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