Tool/software:
Hello, the SN74LVCH16244A datasheet in Section 7.2 states that the component is protected to 2000V HBM for "all pins," however I have a question on if the VCC pins are protected when the component is installed on a board as follows: If the GND pins are connected to a very low impedance ground plane, and if the VCC pin receives a direct injection of 2kV HBM with the I/O pins mostly floating, can the part still handle this?
The purpose of the ESD clamping is to shunt the current spikes into the power supply rails, where they are eaten by the decoupling capacitors. The VCC and GND pins are directly connected to a capacitor and therefore do not need or have any built-in protection.
To expand... even with an external decoupling capacitor, the 2KV HBM discharge could result in the 6.5V Absolute Max VCC specification being exceeded at the VCC pins briefly, depending in the capacitor and trace impedance. Would this discharge scenario present any risk of damage to internal device structures?
Yes, that was stated in my original inquiry. What I am essentially asking TI is if there are any stipulations on that, in case Absolute Max VCC is exceeded during the discharge.
The internal ESD protection is designed to handle ESD events that happen during automated assembly. This means that the device might not be (completely) connected to the circuit.
Hi Kyle,
If the absolute max vcc is violated, there is the possibility of damage to the device. That being said, the external decoupling capacitor makes the violation of the absolute max vcc due to esd very unlikely, assuming a proper layout.
Best,
Ian