SN74AVC1T45DCKRE4

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Logic translators, level shifters are very important components to interface different logic families and voltage levels in the digital circuits, especially in the environment when two sides use different logic standards, such as 3.3V, 5V or even higher voltage, the level shifter can make sure the system can communicate correctly without damaging either side. Here we will take the SN74AVC1T45DCKRE4 –a low-capacitance dual-channel bidirectional level translators from Texas Instruments, as an example, to discuss its application field and working principle.

The packages of SN74AVC1T45DCKRE4 is available in SOT23-5, TSSOP-20 and VSSOP-20 package. This device integrates two bidirectional voltage level translators and accepts inputs levels of 1.2V to 5.5V. It permits translation between VCC1 (1.2V to 3.6V) and VCC2 (2.7V to 5.5V). For example, the A and B ports can be connected to two Gigahertz FPGA components working separately in VCC1 and VCC2 environment. The two ports on the other side of the device can act as transceiver port then taking the part of data communication between FPGA components.

The surge protection function of SN74AVC1T45DCKRE4 makes the device suitable for use in automotive and industrial applications, especially in battery-backed applications or hot-swap applications. With its impressive capability, the device is quite broadly adaptable for numerous applications included automotive, communications, consumer electronics, data processing, distributed power management and industrial control systems.

The technical parameters of the device are quite excellent. It can handle input high voltage up to 5.5V, typical rise and fall time of 4ns/4.5ns, maximum capacitance of 5.5pF, low output active pull of 2µA, and with the support of hot-swap applications. Under the environment of free-air temperature -55°C to 125°C, the device can ensure 5.5V tolerant on the B port over the whole temperature range, and it allows the power up and down sequence which is the same as specified in AEC-Q100.

As what we have mentioned above, SN74AVC1T45DCKRE4 is the dual-channel bidirectional level translators. In comparison with the traditional single-channel level shifters, the two-channel ones have double current driving ability and offer bidirectional translation between two logic families with different voltage levels and different logical structure. The typical working principle of the device is that it provides logic translation between two logical voltage levels VCC1 and VCC2 with A and B ports connected to opposite side, and when the logical input from A or B drives the output level, the other port will automatically follow the output level.

Specifically, in order to achieve the bidirectional voltage translation, the SN74AVC1T45DCKRE4 integrates the NMOS and PMOS which are arranged in series with each other. When the logic level of A toggling, the pull-up MOSFET in the device is activated and pulls the output-B to the VCC2 supply level; while the pull-down MOSFET is off with B still inhigh impedance. The same applies to B side. As such, it achieves the bidirectional logic level translation.

Besides, the SN74AVC1T45DCKRE4 offers the protection circuit inside to make sure the device can work stably and efficiently. Its ESD protection function can sustain up to 17KV Human Body Model ESD and withstand pin-to-pin ESD up to 8KV HBM. Also, the over-voltage protection feature of SN74AVC1T45DCKRE4 can help to prevent GPIO lines from exceeding maximum voltage specs, which protect the system from being damaged without any external elements.

In conclusion, SN74AVC1T45DCKRE4 is a newly designed integrated dual-channel bidirectional level translators from Texas Instruments, especially suitable for the environment which requires low-capacitance, high speed and hot-swap applications. It offers the power up and down sequence and also the protection circuit integrated inside. With such nice characters and integrated function, the device is widely used in automotive, communications, consumer electronics, data processing, distributed power management and industrial control systems.

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