Circuit for voltage pump and a semiconductor memory apparatus using the same

A semiconductor memory apparatus configured to be operated in a capacity smaller than a designed capacity in response to mode selection signals, the apparatus comprising:

• a sequential generation unit configured to generate driving signals in response to a pumping enable signal enabled in accordance with a voltage level of a pumped voltage;
• a pumping control unit configured to generate pump off signals in response to the mode selection signals and at least one of the driving signals;
• and
• a pumping unit including a plurality of pumps and configured to output the pumped voltage in response to at least another one of the driving signals and the pump off signals, wherein the pumping control unit is further configured to select between driving some but not all of the plurality of pumps and driving all of the plurality of pumps,
• wherein the pumping control unit is configured to output a mode determination signal in response to a first mode selection signal for using a first memory matrix of the semiconductor memory apparatus and a second mode selection signal for using a second memory matrix of the semiconductor memory apparatus,
• wherein the pumping control unit includes:
• a plurality of first inverters each configured to receive a respective one of the driving signals;
• at least one mode determiner configured to output the mode determination signal in response to the first mode selection signal and the second mode selection signal;
• and
• a plurality of driving controllers configured to output the pump off signals to said some but not all of the plurality of pumps in response to output signals of the first inverters and the mode determination signal.