74AVCH1T45GW,125 Integrated Circuits (ICs)

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Logic translators, level shifters, are integrated circuits that enable signals from one data format to be converted into a compatible format. They are specially designed to carry out this translation between both the voltage level and data format. Featuring low-voltage, low-power and 3-state outputs, 74AVCH1T45GW and 74HC125 are level translators designed to meet “Mixed-Mode Signal” requirements.

Application Field

The two devices may be used for a variety of applications where different voltage levels are needed and different data formats are required. Common examples are data buses and memory cards, in which each system must be able to recognize the incoming data as valid in order to move on to the next level of data transfer. Additionally, these devices also have applications in other data-interchange fields, such as in portable battery-powered devices, communication interface standards, or power-management standards, etc.

74AVCH1T45GW

The on-chip level shifter 74AVCH1T45GW can shift 4 LVTTL/LVCMOS inputs to 4 LVCMOS outputs. It uses only one power supply (VCC = 3.3V) and ensures low power. This part claims to provide a 6-bit, multiplexed-bus translation from one voltage to another voltage, 1.65V to 3.3V, with a guaranteed logic-level translation capability. That is, if all inputs are 3.3V compliant, all outputs will switch to 3.3V output levels.

74HC125

The 74HC125 features a 4-bit, multiplexed-bus translation from one voltage to another voltage, 1.2V to 3.3V, with a guaranteed logic-level translation capability. So if all inputs are 3.3V compliant, all outputs will switch to 3.3V output levels. Additionally, this level converter can provide higher performance than a traditional discrete level converter design.

Working Principle

Both of these translator devices work on the same principle: voltage-level translation. Inputs (I1 to I4) are typically driven by logic families with operating voltages up to the Vcc level. For low-voltage logic applications which may require a high voltage I/O, these devices allow the logic signals to be directly shifted from the input level to the output level.

In addition, the 74AVCH1T45GW includes a “Mixed-Mode Signal” option that allows low voltage output drivers to operate at an intermediate voltage between the source voltage in which differential outputs swing between 0V and Vcc. This “Mixed-Mode Signal” feature improves signal integrity in low voltage signal transmission, especially in applications with long trace lengths.

The 74HC125 has an active-high output-enable input (OE) that is used to turn on the outputs. The OE signal should be driven with the same voltage as the VCC supply. This provides high speed operation and excellent compatibility between the VCC supply and the input signal.

The 74HC125 also features an “open-drain” capability. This provides flexibility for output power management in applications with multiple levels of power prior to the output stage. In other words, the output voltage levels can be varied from VCC to GND by simply controlling the “drive strength” of the device.

Conclusion

The 74AVCH1T45GW and 74HC125 are two excellent level translators designed to meet “Mixed-Mode Signal” requirements. With their low-voltage, low-power, and 3-state output capabilities, they can easily be integrated into a variety of data-interchange applications. They are cost-effective, economical, and provide high performance.

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