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8-Bit Shift Register 8-Bit Output Register

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The 74AHC594 is an advanced high speed CMOS device. An eight bit shift register accpets data from the serial input (DS) on each positive transition of the shift register clock (SHCP). When asserted low the shift regisister reset function /SHR sets all shift register values to zero and is indepent of all clocks. Also when asserted low the storage register reset function /STR sets all shift register values to zero and is indepent of all clocks Data from the input serial shift register is placed in the output register with a rising pulse on the storages resister clock.(STCP). The storage resister includes output Q7S which is used for cascading information between devices. As the information moves into the storage register, it is asserted on the push-pull outputs Q0-Q7. All registers capture data on rising edge and change output on the falling edge. If both clocks are connected together the input shift register is always one clock cycle ahead of the output register.


• General Purpose Logic • Serial to Parallel Data conversion • Capture and hold data for extended periods of time. • Allow simple serial bit streams from a microcontroller to control as many peripheral lines as needed. • Wide array of products such as: o Computer peripherals o Appliances o Industrial control

Product Specifications

Product Parameters

Number of Gates -
Family AHC
VCC Min (V) 2 V
VCC Maximum Rating 5.5 V
tpd max @ (1.5V) - ns
tpd max @ 1.8V (ns) - ns
tpd max @ 2.5V (ns) - ns
tpd max @ 3.3V (ns) 10.4 ns
tpd max @ 5.0V (ns) 6.9 ns
Input/ Output Current 8
Description 8-Bit Output Register, 8-Bit Shift Register
Output Type Push-Pull

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Mouser Electronics Inc. 2500 10/4/2022 South America, North America, Asia, Europe, Middle East Buy Now
Digi-Key Electronics 2161 10/3/2022 Europe, Asia, North America Buy Now
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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site