Described is an apparatus comprising a plurality of memory arrays, local write assist logic units, and read/write local column multiplexers coupled together in a group such that area occupied by the local write assist logic units and the read/write local column multiplexers in the group is smaller than it would be when global write assist logic units and the read/write global column multiplexers are used. Described is a dual input level-shifter with integrated latch. Described is an apparatus which comprises: a write assist pulse generator operating on a first power supply; one or more pull-up devices coupled to the write assist pulse generator, the one or more pull-up devices operating on a second power supply different from the first power supply; and an output node to provide power supply to a memory cell.