Bi-directional auto-sensing voltage level shifter

April 14, 2021 // By Peter Clarke
Bi-directional auto-sensing voltage level shifter
Diodes Inc. (Plano, Texas) has expanded its family of voltage-level shifters with the release of the PI4ULS3V304AQ.

This voltage level shifter addresses the challenge of lower voltage microprocessors and microcontrollers incor porated into automotive systems , which are required to drive external devices operating at different voltage levels to their own such as sensors and EMI filters . 


This configurable 4-bit IC offers bi-directional voltage-level translation at a dat a rate of 140Mbps and allows push-pull type applications to be addressed . 


Through the PI4ULS3V304AQ's A and B ports, two different power supply rails can be tracked. The IC can offer 0.9V to 2.0 V translation on the A port and translati on fr om 1.65V to 3.6 V on the B port. Propagation delay is kept to 13ns while running at full 100pF capacitive drive. Being AEC-Q100 Grade 1 qualified, this device is suitable for automotive implementation. Among the key applications in which it will be employed are those relating to infotainment, driver assistance and telematics . 


An operational temperature range of -40°C to 12 5°C is covered and 2kV electro-static discharge (ESD) protection has been incorporated. The innovative output e nable (EN) function means that either of the PI4ULS3V304AQ ’s respective I/O ports (A or B) can be shut down when not needed, in order to lower the power draw . Automated bi-directional operation eliminates the need for inclusion of a direction control pin.  


PI4ULS3V304AQ is supplied in a 12-pin UQFN package. This automotive-compliant level translator has a unit price of $0.55 in 5000 piece quantities. 


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