View mc74hc14 datasheet:

MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC54/74HC14A Hex Schmitt-Trigger Inverter High–Performance Silicon–Gate CMOS The MC54/74HC14A is identical in pinout to the LS14, LS04 and the J SUFFIX CERAMIC PACKAGE HC04. The device inputs are compatible with Standard CMOS outputs; 14 CASE 632–08 with pullup resistors, they are compatible with LSTTL outputs. 1 The HC14A is useful to “square up” slow input rise and fall times. Due to hysteresis voltage of the Schmitt trigger, the HC14A finds applications in noisy environments. N SUFFIX PLASTIC PACKAGE 14 CASE 646–06 • Output Drive Capability: 10 LSTTL Loads 1 • Outputs Directly Interface to CMOS, NMOS and TTL • Operating Voltage Range: 2 to 6V D SUFFIX • Low Input Current: 1µA SOIC PACKAGE 14 • High Noise Immunity Character