The NXP 74HC04 and 74HCT04 integrated circuit features 6 hex inverters. The inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.
Input levels for 74HC04: CMOS level and for 74HCT04: TTL level.
The supply voltage (VCC) ranges from -0.5V to +7V.
PDF manual table of contents: general description, features and benefits, ordering information, functional diagram, pinning information, pin description, functional description, limiting values, recommended operating conditions, static characteristics, dynamic characteristics, waveforms, package outline, abbreviations and revision history.