SN74LS164 8-Bit Serial-In Parallel-Out Shift Register
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Prices updated: 13 Oct 2026
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About this product
The SN74LS164 is an 8-bit serial-in, parallel-out shift register from the 74LS TTL family, with gated serial data inputs and an asynchronous clear. It is widely used to expand microcontroller outputs, driving LEDs, displays and other parallel loads with only a few pins.
Specifications
- Function
- 8-bit serial-in, parallel-out shift register
- Logic family
- LS-TTL (74LS)
- Clear
- Asynchronous, active low
- Supply voltage
- 4.75 V to 5.25 V
- Package
- DIP-14
Frequently asked questions
How do I cascade several SN74LS164 devices?
Connect the Q7 output of one device to a serial input of the next, and share the clock and clear lines across all devices. This gives you longer parallel outputs using the same three control pins.
Do I need to use the clear pin?
The clear input is active low and resets all outputs to low when pulled low. If you do not need it, tie it high so it does not interfere with operation.
