1. General description

The 74HC166; 74HCT166 is an 8-bit serial or parallel-in/serial-out shift register. The device

features a serial data input (DS), eight parallel data inputs (D0 to D7) and a serial output (Q7).

When the parallel enable input (PE) is LOW, the data from D0 to D7 is loaded into the shift register

on the next LOW-to-HIGH transition of the clock input (CP). When PE is HIGH, data enters the

register serially at DS with each LOW-to-HIGH transition of CP. When the clock enable input (CE)

is LOW data is shifted on the LOW-to-HIGH transitions of CP. A HIGH on CE disables the CP input.

Inputs include clamp diodes which enable the use of current limiting resistors to interface inputs to

voltages in excess of VCC.

2. Features and benefits

• Wide supply voltage range from 2.0 V to 6.0 V

• CMOS low power dissipation

• High noise immunity

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

• Synchronous parallel-to-serial applications

• Synchronous serial input for easy expansion

• Input levels:

• For 74HC166: CMOS level

• For 74HCT166: TTL level

• Complies with JEDEC standards:

• JESD8C (2.7 V to 3.6 V)

• JESD7A (2.0 V to 6.0 V)

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

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

74HC166PW属于集成电路（IC） > 移位寄存器。安世半导体(中国)有限公司制造生产的74HC166PW移位寄存器移位寄存器是低级逻辑器件，通常用于在串行和并行方式之间转换数字逻辑信号形式的数据，或在数字字内移动数据位的位置。移位寄存器通常使用集成到一个设备中的一组触发器来实现，常用于集成度更高的逻辑器件，但仍可用于 I/O 扩展等应用，在这些应用中离散形式的函数可能会非常有用。