Patent ID: 8879332

Claim:
A flash memory having a read tracking clock, comprising: a current detecting circuit detecting a pre-charge time of the flash memory and comprising: a copy circuit, comprising: a reference current generator generating a reference current, and having a first terminal and a second terminal connected to a ground; a first switch having a first terminal receiving a power supply voltage, a second terminal coupled to the first terminal of the reference current generator and generating a first charge current, and a control terminal receiving a first bit line clamping signal; and a second switch having a first terminal receiving the power supply voltage, a second terminal generating a second charge current being a copy of the first charge current, and a control terminal receiving the first bit line clamping signal; a mirror circuit reflecting the second charge current to a comparing circuit; wherein and the comparing circuit comparing the second charge current with a second reference current, and sending out a signal indicating the pre-charge time being accomplished when the second reference current is larger than the second charge current.