The DS1744 model that is equivalent to the DS1644-120+ is the DS1744-70+, actually it is better because of the 70ns access time (there is no DS1744-120+).
The DS1744 model that is equivalent to the DS1644-120+ is the DS1744-70+, actually it is better because of the 70ns access time (there is no DS1744-120+).