SN74F245DWG4

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SN74F245DWG4 is a device designed as logic buffers, drivers, receivers, and transceivers that developed by Texas Instruments. It is a low voltage non-inverting octal receiver/driver for implementation of logic level shifting. This device includes two non-inverting buffers with open-collector outputs and are fully transitioning. It is suitable for use in wide variety of applications that requires level shifting between two incompatible logic levels, from low to high or the other way around.

The SN74F245DWG4 has two series of octal buffering driver transceivers which consists of input and output group. The outputs features open-collector logic levels and can be active either low or high. The High level logic is labeled with "H" and consists of four logic inputs and four logic open collector outputs, while the low logic is labeled with "L" and consists four logic inputs and four logic open collector outputs. The device has TTL compatible inputs and the VCC powered-up input and output enable the design with symmetrical input and output levels.

Circuit application of SN74F245DWG4 are plentiful. It can be found in circuit applications such as data switches, data multiplexers, demultiplexers and audio data formats converters. Its commonly used in interfacing logic gates, logic modules and even ICs which operate with different pull-up or pull-down configuration. It can also be used to switch between logic levels when connecting to ports or even used in horizontal and vertical scanning. The SN74F245DWG4 can handle data rates up to 30 Mbps without significant signal degradation.

The SN74F245DWG4 is designed to have a current sink rated at 16mA and a power dissipation of 200mW at 25⁰C. It is designed to operate with a supply voltage of 4.5V to 5.5V and has wide temperature ranges of -55⁰C to +125⁰C. The SN74F245DWG4 has input and output voltage ratings of 0.4V to 2V and -0.4V to 0.4V, respectively. This device is made from advanced CMOS technology and has a high source current rating of 24mA and a high sink current rating of 16mA. The device has a propagation delay time of 25ns with maximum low power consumption of 0.4mA.

The overall working principle of SN74F245DWG4 can be summarised as such. The signals from the TTL compatible inputs are passed to the buffer amplifier, which compares the input signal with the reference voltages of the supply voltage. This voltage comparison is done by the biasing resistors, zener diodes and differential circuits. The logic output is set according to the logic input. For example, when logic high is applied to the input, logic high will be given at the output. The logic outputs are generated using output amplifier that differs in the logic level and voltage. This device provides low power dissipation which is a valuable feature and is beneficial in power sensitive circuit applications.

In conclusion, the SN74F245DWG4 is a low voltage non-inverting octal receiver/driver for implementation of logic level shifting from low-to-high and vice-versa. It features TTL compatible inputs, open-collector output levels and adjustable data rate. It can be used in various circuit applications and is suitable for switching logic levels and logic level shifting. The device is reliable, low cost and is designed to have low power consumption.

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