TPD4E001 Channel Clamp Voltage

Joey Christ

Please explain the "Vc" ("Channel Clamp Voltage") in the electrical characteristics table. What node can reach "Vcc + 25V"? What voltages sum to get the "+25V"?

over 12 years ago

0 Avi Chami1 over 12 years ago

Mastermind 7395 points

Anyone of the four channels protected can reach Vcc+25V upon application of an ESD discharge of 15kV according human body model. That means, the applied 15kV will be clamped to Vcc+25V max. If Vcc = 3.3V, upon applying a 15kV ESD, the protected I/O will see 28.3V max.

0 Joey Christ over 12 years ago in reply to Avi Chami1

TI__Intellectual 2350 points

This seems to contradict p5 section 5. (a) which states that IOx will be clamped to "Vcc + Vf" which is much lower than "Vcc+25V". Please help me to understand what factors account for the "+25V". Is this due to dynamic resistance of the diode?

0 Avi Chami1 over 12 years ago in reply to Joey Christ

Mastermind 7395 points

No, I think that the issue is that ESD are very fast pulses so it takes time until the diode reacts, the final clamping is to Vf but the pulse peak succeeds to pass as a peak much higher than Vf.

Interface

Interface forum

TPD4E001 Channel Clamp Voltage