A GlobalFoundries 180nm LPe Specialized 5V ESD Clamp.
A key attribute of this 5V Clamp is that it can be used for either signal protection or 1.8V power supplies. The clamp is a single cell, 44um x 32um in size. It is built from the substrate to metal 6. The clamp is very dense in metal, and diffusion, a wide area around the clamp (3um to 10um) should have minimum metals between layers 1 and 3, as well as little diffusion, to pass directly to chip top.
Cell Names and Variation
| Cell Name | Description |
| ESD50_ggnmos | Standard 5V Clamp |
Pin Out and Function
| Parameter | Description |
| PAD50 | Signal/Power |
| VSS | Ground |
| SUB | SOI-Substrate |
Electrical Specifications
| Parameter | Description | Min | Typical | Max | Unit |
| Vm ax | Max Voltage at PAD 50 | -0.5 | 5 | 5.6 | Volts |
| Il eak | Leakage Current | N/A | 1.5 | 15 | nA |
| Cm ax | Load Capacitance | N/A | N/A | 0.5 | pF |
Metallization
- PAD50 (Metal 4): Primary ESD current path. Robust connection, in wide thick metals and losts of vias, compliant with ESD.
- VSS (Metal 4): Primary ESD current path. Robust connection, in wide thick metals and losts of vias, compliant with ESD
- SUB (schematic only): There is no layout connection for SUB. This is the SUB connection inherent to whatever layout top level the clamp is placed into. The CDL netlit, however, has pin for it, and must connect to the SUB net of the top-level block the layout is placed in GROUND reference for ESD.
