View 74lvc821a 1 datasheet:

INTEGRATED CIRCUITS 74LVC821A 10-bit D-type flip-flop with 5-volt tolerant inputs/outputs; positive-edge trigger (3-State) Product specification 1998 Sep 25 Philips Semiconductors Philips Semiconductors Product specification 10-bit D-type flip-flop with 5-volt tolerant 74LVC821A inputs/outputs; positive-edge trigger (3-State) FEATURES DESCRIPTION The 74LVC821A is a high performance, low-power, low-voltage • 5-volt tolerant inputs/outputs, for interfacing with 5-volt logic Si-gate CMOS device and superior to most advanced CMOS • Supply voltage range of 2.7V to 3.6V compatible TTL families. • Complies with JEDEC standard no. 8-1A Inputs can be driven from either 3.3V or 5.0V devices. In 3-state operation, outputs can handle 5V. This feature allows the use of • Inputs ac