74HC237D.652 Nexperia

The 74HC237D.652 is a high-speed octal bus transceiver with 3-state outputs manufactured by Nexperia. It is designed for use in 3-state bus systems requiring active bus hold and bus line reconnect. The transceiver has eight channels, each with a single input and three-statebus output. It is designed to be used with 3-state memory and peripheral circuits. The device features two active-low enable inputs (E1 and E2), which control the outputs of these devices in the three-state mode. E1 is the active-low enable input for the four most significant output bits (Q7 to Q4) and E2 is the active-low enable input for the least significant output bits (Q3 to Q0). When either enable is HIGH, the corresponding outputs are in the high-impedance state. When both enable inputs are LOW, the outputs are enabled and move in response to their input levels.