This application note introduces Fairchild Semiconductor's Bushold technology
The document describes the 'bushold' feature in Fairchild Semiconductor's CROSSVOLT family of low-voltage logic products. This circuitry is designed to solve problems associated with floating inputs by maintaining a valid logic state on unloaded or undriven inputs, thereby eliminating the need for external conditioning components like resistors.
| Family Designation (LVT) | 74LVTHxxx |
|---|---|
| Family Designation (VEX) | 74VCXHxxx |
It maintains a valid logic state on an unloaded input and eliminates the need for external conditioning components.
It uses a low drive inverter that provides feedback to the device input and bus line, holding the last received valid signal level.
It is not appropriate when devices with bushold are used in conjunction with conditioning resistors, as this can cause high power dissipation.