SN74HC244 and SN74AHC244

SCAA034: AHC Logic Family says:

Some advantages of using AHC over HC are:

• The AHC logic family is almost three times faster than the HC family. The AHC logic family has a typical propagation delay of about 5.2 ns.
• The AHC logic family allows designers to combine the low-noise characteristics of HCMOS devices with today’s performance levels without the overshoot/undershoot problems typical of higher-drive devices.
• The AHC family has lower power consumption than the HC family.
• The output drive is ±8 mA at 5-V VCC and ±4 mA at 3.3-V VCC.
• …