Level shifter
electronic circuit that translate signals between different logic levels
In digital electronics, a level shifter, also called level converter or logic level shifter, or voltage level translator, is a circuit used to translate signals from one logic level or voltage domain to another, allowing compatibility between integrated circuits with different voltage requirements, such as TTL and CMOS. Modern systems use level shifters to bridge domains between processors, logic, sensors, and other circuits. In recent years, the three most common logic levels have been 1.8V, 3.3V, and 5V, though levels above and below these voltages are also used.
Types of level shifter
Uni-directional – all input pins are dedicated to one voltage domain, all output pins are dedicated to the other.
Bi-directional with dedicated ports – each voltage domain has both input and output pins, but the data direction of a pin does not change.
Bi-directional with external direction indicator – when an external signal is changed, inputs become outputs and vice versa.
Bi-directional, auto-sensing – a pair of I/O spanning voltage domains can act as either inputs or outputs depending on external stimulus without the need for a dedicated direction control pin.
Hardware implementation
Fixed function level shifter ICs - these ICs provide several different types of level shift in fixed function devices. Often lumped into 2-bit, 4-bit, or 8-bit level shift configurations offered with various VDD1 and VDD2 ranges, these devices translate logic levels without any additional integrated logic or timing adjustment.
Configurable mixed-signal ICs (CMICs) – level shifter circuitry can also be implemented in a CMIC. The no-code programmable nature of CMICs allows designers to implement fully customizable level shifters with the added option to integrate configurable logic or timing adjustments in the same device.
Power management ICs realize level shifters using differential signaling.
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