This paper presents a new algorithm for discrete-time sliding mode control using output feedback. It has been shown that, when the output of the system is sampled slower than the input, a discrete-time sliding mode can be obtained. The method is very general and is applicable to any controllable and observable linear time-invariant single input single output system. The proposed technique is illustrated with a numerical example. © 2011 Intl Journal of Adv Mechatr.