SN74ALS244CN

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Logic - Buffers, Drivers, Receivers, Transceivers

The SN74ALS244CN is an integrated circuit manufactured by Texas Instruments. It belongs to the TTL family. This monolithic device contains 10 different TTL gate including 4 buffers, 3 drivers, 2 receivers, and 1 transmitter with full CMOS compatibility and low power supply current.

ApplicationField

The SN74ALS244CN is versatile and can be used in many applications. It can be used as a signal buffer, line driver, or a clock driver. It can also be used as a signal multiplexer or a line receiving circuit. Additionally, it can be used in high-speed logic applications such as flip-flops circuits and registers.

Working Principle

The SN74ALS244CN is based on a differential stage topology and uses open-drain structures as buffers, drivers, and receivers. The differential stage includes two current sources, one for the input and one for the output of the buffer/driver. When the input signal is clearly above the logical low threshold, the output is raised to the logical high level. If the input signal falls below the logical low threshold level, the output is driven to the logical low level.

The output is tristate when the ENABLE input is held low and becomes active if the ENABLE input is driven high. Additionally, an impedance of 50 ohms is put across the two outputs of the buffers. The outputs of the driver can be either open-drain or active-low push-pull dependent on the selection.

The receivers of the SN74ALS244CN circuit are based on common-source inverters. The inputs of the inverters are protected with Zener diodes in order to provide protection against electro-static discharge and latch-up. The receivers of the SN74ALS244CN are configured in such a way that the output logic is non-reversing, meaning the output signal is the same as the input signal but of opposite polarity.

The transmitter of the SN74ALS244CN is composed of a resistive voltage divider and two drivers. The resistive voltage divider is used for reference voltage generation and the drivers are used for signal transmission. The drivers are configured in an open-loop configuration and are capable of driving up to 3mA into a resistor of 50 ohms.

Conclusion

The SN74ALS244CN IC is one of the most versatile and widely used TTL-based ICs available. It can be used in a variety of applications as a buffer, driver, receiver, or transmitter. It is based on a differential stage topology and uses open-drain structures as buffers, drivers, and receivers. The output is tristate when the ENABLE input is held low and the transmitter is composed of a resistive voltage divider and two drivers.

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