1. General description

The 74AHC164; 74AHCT164 is an 8-bit serial-in/parallel-out shift register. The device features two

serial data inputs (DSA and DSB), eight parallel data outputs (Q0 to Q7). Data is entered serially

through DSA or DSB and either input can be used as an active HIGH enable for data entry through

the other input. Data is shifted on the LOW-to-HIGH transitions of the clock (CP) input. A LOW on

the master reset input (MR) clears the register and forces all outputs LOW, independently of other

inputs. Inputs are overvoltage tolerant. This feature allows the use of these devices as translators

in mixed voltage environments.

2. Features

• Wide supply voltage range from 2.0 V to 5.5 V

• Overvoltage tolerant inputs to 5.5 V

• High noise immunity

• CMOS low power dissipation

• Balanced propagation delays

• All inputs have Schmitt-trigger actions

• Input levels:

• For 74AHC164: CMOS level

• For 74AHCT164: TTL level

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• CDM JESD22-C101C exceeds 1000 V

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

• Multiple package options

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

74AHC164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74AHC164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。