Voltage monitor and off-chip driver of memory device

Abstract

A voltage monitor of a memory device and an off-chip driver (OCD) are provided. the voltage monitor includes a first voltage divider, a bridge switch, an OCD and a control circuit. The first voltage divider receives an internal voltage in the memory device, and divides the internal voltage to generate a sensing signal on a sensing node. The bridge switch is coupled between the sensing node and a connecting pad. The OCD includes a pull-up circuit and a pull-down circuit. The control circuit is coupled to the bridge switch and the OCD. In a test mode, the control circuit turns on the bridge switch. In the test mode, the control circuit provides a bias voltage to the OCD to let a first current value of a first leakage current flowing through the pull-up circuit match a second current value of a second leakage current flowing through the pull-down circuit.