1. General description

The 74HC173; 74HCT173 is a quad positive-edge triggered D-type flip-flop. The device features

clock (CP), master reset (MR), two input enable (E1, E2) and two output enable (OE1, OE2) inputs.

When the input enables are LOW, the outputs Qn will assume the state of their corresponding Dn

inputs that meet the set-up and hold time requirements on the LOW-to-HIGH clock (CP) transition.

A HIGH on either input enable will cause the device to go into a hold mode, outputs hold their

previous state independently of clock and data inputs. A HIGH on MR forces the outputs LOW

independently of clock and data inputs. A HIGH on either output enable pin causes the outputs to

assume a high-impedance OFF-state. Operation of the output enable inputs does not affect the

state of the flip-flops. Inputs include clamp diodes. This enables the use of current limiting resistors

to interface inputs to voltages in excess of VCC.

2. Features and benefits

• Complies with JEDEC standard no. 7A

• Input levels:

• For 74HC173: CMOS level

• For 74HCT173: TTL level

• Gated input enable for hold (do nothing) mode

• Gated output enable control mode

• Edge-triggered D-type register

• Asynchronous master reset

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

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

74HC173属于集成电路（IC） > 触发器。安世半导体(中国)有限公司制造生产的74HC173触发器触发器是能够存储单个逻辑状态或信息“位”的基本数字存储器件。这些器件至少有两个输入；一个或多个用于传递要存储的数据，另一个用于指示存储该数据的时间点。不同的触发器类型，例如 D（延迟）、SR（置位复位）和 JK，对提供给其输入的信号有不同的响应，可用于实现不同的逻辑功能。这些器件与锁存器的不同之处在于它们是边缘敏感器件，其保持的逻辑状态仅在接收到有效时钟信号时才会改变。