JEDEC JESD8-21A

This standard defines the dc and ac single-ended (data) and differential (clock) operating conditions, I/O impedances, and the termination and calibration scheme for 1.35V Pseudo Open Drain I/Os. The 1.35V Pseudo Open Drain interface, also known as POD135, is primarily used to communicate with GDDR5 or GDDR5M SGRAM devices.