General description

The 74HC74 and 74HCT74 are dual positive edge triggered D-type flip-flop. They have individual data (nD), clock (nCP), set (nSD) and reset (nRD) inputs, and complementary nQ and nQ outputs. Data at the nD-input, that meets the set-up and hold time requirements on the LOW-to-HIGH clock transition, is stored in the flip-flop and appears at the nQ output. Schmitt-trigger action in the clock input, makes the circuit highly tolerant to slower clock rise and fall times. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

■ Input levels:

◆ For 74HC74: CMOS level

◆ For 74HCT74: TTL level

■ Symmetrical output impedance

■ Low power dissipation

■ High noise immunity

■ Balanced propagation delays

■ Specified in compliance with JEDEC standard no. 7A

■ ESD protection:

◆ HBM JESD22-A114F exceeds 2000 V

◆ MM JESD22-A115-A exceeds 200 V

■ Multiple package options

■ Specified from -40 °C to +85 °C and from -40 °C to +125 °C

74HCT74屬于集成電路（IC） > FIFO 存儲(chǔ)器。恩智浦半導(dǎo)體公司制造生產(chǎn)的74HCT74FIFO 存儲(chǔ)器先入先出 (FIFO) 存儲(chǔ)器可用于數(shù)字信息的短期存儲(chǔ)，其中信息檢索順序和序列與信息存儲(chǔ)順序和序列相同。這類(lèi)產(chǎn)品又稱(chēng)為隊(duì)列或緩沖存儲(chǔ)器，通常用于在單獨(dú)的設(shè)備之間交換信息，尤其是在數(shù)據(jù)以不同的速率或在略微不同的時(shí)間點(diǎn)生成和使用的情況下。