Voltage glitch detectors

A method of detecting glitches in an integrated circuit comprising:

• filtering a supply voltage on a supply voltage node to generate a filtered supply voltage;
• supplying the filtered supply voltage to a data input of a latch circuit;
• responsive to a positive voltage glitch occurring on the supply voltage node, causing a voltage increase corresponding to the positive voltage glitch to appear on a first node between a capacitor and a resistor serially coupled between the supply voltage node and ground;
• supplying the voltage increase on the first node to a first circuit and generating a first circuit output signal;
• and
• clocking the latch circuit using the first circuit output signal to cause the latch circuit to supply an asserted latch signal indicative of the positive voltage glitch.

An integrated circuit comprising:

• a filter coupled to a supply voltage node configured to receive a supply voltage and provide a filtered supply voltage;
• a positive glitch detector circuit including,
• a first capacitor and a first resistor that are serially coupled between the supply voltage node and ground;
• a first amplifier circuit having an input coupled to a first node between the first capacitor and the first resistor and the first amplifier circuit configured to supply a first output signal;
• a first latch circuit having a clock input coupled to the first output signal and having a data input coupled to the filtered supply voltage;
• a negative glitch detector including,
• a second capacitor and a second resistor coupled in parallel between the supply voltage node and a second node;
• a second amplifier circuit having an input coupled to the second node and the second amplifier circuit being configured to supply a second output signal;
• and
• a second latch circuit having a second clock input coupled to the second output signal and having a second data input coupled to the filtered supply voltage.