MM74HCT05M pdf datasheet (Hex

The MM74HCT05 is a logic function fabricated by using
advanced silicon-gate CMOS technology, which provides
the inherent benefits of CMOS—low quiescent power and
wide power supply range. The device is also input and output
characteristic and pinout compatible with standard
DM74LS logic families. The MM74HCT05 open drain Hex
Inverter requires the addition of an external resistor to perform
a wire-NOR function.
All inputs are protected from static discharge damage by
internal diodes to VCC and ground.
MM74HCT devices are intended to interface between TTL
and NMOS components and standard CMOS devices.
These parts are also plug-in replacements for LS-TTL
devices and can be used to reduce power consumption in
existing designs.
Features
n Open drain for wire-NOR function
n LS-TTL pinout and threshold compatible
n Fanout of 10 LS-TTL loads
n Typical propagation delays:
tPLH (with 1 kW resistor) 10 ns
tPHL (with 1 kW resistor) 8 ns