MC74ACT245DWR2G

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Introduction

The MC74ACT245DWR2G is a two port bus transceiver, one port host and one port device, which is used in Logic - Buffers, Drivers, Receivers, Transceivers. It has a 3-state enable pin and is designed to be connected directly to the A side (host side) of logic devices. This device offers full bi-directional current transfer between individual ports. It is designed to overcome weak pull-up devices by providing differential current transfer, drive currents and recovery times. It is rated for a wide range of supply voltage, operating over 1.2V to 5V and can support multiple types of operating frequencies.

Features and Specifications

• High speed differential device with data rate of 16MHz
• Low-voltage version up to 1.8V
• Compatible with DE9, DLO and DSB-09 port connectors
• 100mA drive current
• Minimum voltage swing of 0.35V
• Low-power dissipation
• Output enable pin
• Input amplitude of 0.7V to 5V
• Supports multiple operating frequencies

Applications

The MC74ACT245DWR2G is commonly used in multiple applications, such as USB, and integrated circuits. It is typically employed in synchronous applications where high speeds are necessary, as it offers lower propagation delay and power consumption in comparison to other transceivers. It is also employed in communication protocols like Ethernet, FireWire and connecting between digital supplies in consumer products.

Working Principle

The MC74ACT245DWR2G is a two port bus transceiver, with the A side (host side) connected directly to the logic device. The data input lines on the A-side are connected to the local bus and are monitored by the device. The data output lines on the A side can be put in a high impedance state by using the OUT/EN pin. The data output lines on the B-side are tied to two sets of lines, with one set connected to the local bus and the other set tied off to ground. The data input lines on the B side are tied to the local bus and tie the other set to ground.

When the OUT/EN pin is in the negative logic state, the data output lines are held in a high impedance state and the data input lines are connected to the local bus. When the OUT/EN pin is in the positive logic state, the data output lines are driven according to the data from the local bus and the data input lines are allowed to be monitored. The two sets of data input lines on each side are compared for consistency and any difference between inputs is monitored and reported to the device’s output lines. When the inputs match, the difference is reported as low and the device’s output will be low. In the event immediate action is required, the device’s output lines can be manually set to a low state.

In terms of power consumption, the MC74ACT245DWR2G is designed to offer low dissipation and low supply current, making it ideal for battery-operated and space-constrained applications. The low-power mode is enabled through the channel enable pin, and reduces the active power consumption by more than 50%. The device is designed to offer full bi-directional current transfer between individual ports, allowing for fast data transfer and low propagation delay.

Conclusion

The MC74ACT245DWR2G is an ideal transceiver for high-speed applications that require low power consumption and space-constrained devices. It has a wide range of supply voltages and offers full bi-directional current transfer between individual ports. The device is suited for a variety of applications, such as USB, integrated circuits and communication protocols. This device is perfect for any application that needs the highest speed and the lowest power usage.

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