This document introduces the MM74C914 Hex Schmitt Trigger, which is a monolithic CMOS hex Schmitt trigger with a special input protection scheme. It allows the input voltage levels to exceed VCC or ground by at least 10V (VCC-25V to GND + 25V), making it suitable for applications involving voltage level shifting or mismatched power supplies. It has low variation in positive and negative threshold voltages with respect to temperature (typ 0.0005V/°C at VCC = 10V) and guaranteed hysteresis (VT+ - VT- ≥ 0.2 VCC). Other features include: hysteresis: 0.45 VCC (typical), 0.2 VCC guaranteed; special input protection: extended input voltage range; wide supply voltage range: 3V to 15V; high noise immunity: 0.7 VCC (typical); low power TTL compatibility: fan out of 2 driving 74L.
The document describes the MM74C914, a monolithic CMOS Hex Schmitt trigger designed with special input protection. This feature allows input voltage levels to exceed VCC or ground by at least 10V, making it suitable for applications involving voltage level shifting or mismatched power supplies.
Key characteristics include guaranteed hysteresis of at least 0.2 VCC and a wide operating supply voltage range from 3V to 15V. The device offers high noise immunity with typical values of 0.7 VCC and maintains low power consumption compatible with TTL logic families.
| Supply Voltage Range (Operating) | 3V to 15V |
|---|---|
| Input Voltage Protection Range | VCC −25V to GND + 25V |
| Operating Temperature Range | -40°C to +85°C |
| Hysteresis Guarantee | ≥ 0.2 VCC |
| Typical Hysteresis | 0.45 VCC |
| Typical Noise Immunity | 0.7 VCC |
The device operates with a supply voltage range of 3V to 15V.
Yes, the special input protection allows input levels to exceed VCC or ground by at least 10V.
The datasheet guarantees a hysteresis of at least 0.2 times the supply voltage (VCC).