The ST2378E is an 8-bit, dual supply, bi-directional level translator with 15kV ESDprotection on I/Os at VCC side. It is designed to interface data transfer between low-voltage ASICs/PLDs and higher voltage systems. Externally applied voltage, VCC and VL, set logic levels at both sides with range specified as 1.71V VL 5.5V and VL VCC 5.5V. For proper operation, VCC should be set higher than VL.