1 Features

• Operating range 2V to 5.5V VCC

• Low delay, 14ns maximum (VCC = 5V, CL = 50pF)

• Latch-up performance exceeds 250mA

per JESD 17

2 Applications

• Increase the number of outputs on a

microcontroller

• Store up to 8 bits of data temporarily

3 Description

The SN74AHC164 is an 8-bit shift register with ANDgated

serial inputs and an asynchronous clear (CLR)

input. Outputs are directly connected to the internal

shift register, resulting in immediate output changes

as values are shifted into the register. The gated

serial (A and B) inputs permit complete control over

incoming data; a low at either input inhibits entry of

the new data and resets the first flip-flop to the low

level at the next clock (CLK) pulse. A high-level input

enables the other input, which then determines the

state of the first flip-flop. Data at the serial inputs can

be changed while CLK is high or low, provided the

minimum set-up time requirements are met. Clocking

occurs on the low-to-high-level transition of CLK.