NXP 4000 Series Logic Devices
- NXP HEF4044BT, The HEF4044B is a quad R/S latch with 3-state outputs, with a common output enable input (OE). Each latch has an active LOW set input (1S to 4S), an active LOW reset input (1R to 4R) & an active HIGH 3-state output (1Q to 4Q). When OE is HIGH, the latch output (n Q) is determined by the n R & n S inputs. When OE is LOW, the latch outputs are in the high impedance OFF-state. OE does not affect the state of the latch. The high impedance off-state feature allows common bussing of the outputs. It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS, or another input. NXP HEF4044BT Quad R/S Latch Tri-State Outputs SO-16