Key Specifications

The UM3284F is 4-channel ESD-protected level translator provides the level shifting necessary to allow data transfer in a multi-voltage system. Externally applied voltages, V_CCB and V_CCA, set the logic levels on either side of the device. A low-voltage logic signal present on the V_CCA side of the device appears as a high-voltage logic signal on the V_CCB side of the device, and vice-versa. The UM3284F bidirectional level translator utilizes a transmission-gate based design to allow data translation in either direction (V_CCA↔V_CCB) on any single data line. V_CCA and V_CCB have a common operating voltage from +1.1V to +5.5V. V_CCA being less than V_CCB is no longer a requirement.

This device is fully specified for partial-power-down applications using IOFF. The IOFF circuitry disables the outputs, thus preventing damaging current backflow through the device when it is powered down. The V_CC isolation feature is designed so that if either V_CC input supply is below 100mV, all level shifter outputs are disabled and placed into a high impedance state. The UM3284F enters a three-state output mode to reduce supply current when output enable (OE) is low. The UM3284F is designed so that the OE input circuit is supplied by V_CCA. ±8kV ESD protection on both sides for greater protection in applications that route signals externally.

The UM3284F series are available in TSSOP14, QFN12 1.7×2.0, QFN12 1.8×1.8 and QFN14 3.5×3.5 packages.