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

74HC74属于集成电路（IC） > FIFO 存储器。恩智浦半导体公司制造生产的74HC74FIFO 存储器先入先出 (FIFO) 存储器可用于数字信息的短期存储，其中信息检索顺序和序列与信息存储顺序和序列相同。这类产品又称为队列或缓冲存储器，通常用于在单独的设备之间交换信息，尤其是在数据以不同的速率或在略微不同的时间点生成和使用的情况下。