These devices contain 4-2-3-2 input AND-OR-INVERT gates. They perform the Boolean function Y = ABCD + EF + GHI + JK\. The 'S64 has totem-pole outputs and the 'S65 has open-collector outputs. The SN54S64 and the SN54S65 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74S64 and the SN74S65 are characterized for operation from 0°C to 70°C.