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The SN74HC165PWR is an 8-bit parallel-load shift register that captures eight inputs on a single SHIFT/LOAD pulse and shifts them out serially, freeing microcontroller pins by converting a parallel bus to one data line. With a 2 V to 6 V supply, a 25 MHz clock and a Schmitt-trigger clock input for noise immunity, it is a standard building block for switch scanning, input expansion and parallel-to-serial conversion in industrial, consumer and communications equipment.
ManufacturerTexas Instruments
Package16-TSSOP (PW)
SeriesSN74HC165
Technical Specifications
| Parameter | Value / Specification |
|---|---|
| Logic Function | 8-bit parallel-load serial-out shift register |
| Channels / Elements | 8 bits (single 8-stage register) |
| Supply Voltage | 2 V to 6 V |
| Package / Case | 16-TSSOP (PW) |
| Clock Frequency | up to 25 MHz typical at 5 V |
| Propagation Delay | 14 ns typical at 5 V |
| Input Type | SHIFT/LOAD and clock-enable (CLK INH) controls |
| Output Type | Complementary serial (QH') output |
| Operating Temperature | -40°C to +85°C |
| Noise Immunity | Schmitt-trigger clock input improves noise margin |
Key Features & Applications
- 8-bit parallel-load architecture captures all inputs in one clock and shifts them out serially
- Wide 2 V to 6 V supply supports both 3.3 V and 5 V logic systems
- Up to 25 MHz clock frequency sustains high-speed serial data transfer
- Schmitt-trigger clock input improves noise immunity in industrial environments
- Complementary serial output (QH') simplifies daisy-chaining of multiple devices
- Asynchronous SHIFT/LOAD control selects parallel-load or shift mode
- 16-pin TSSOP package rated for -40°C to +85°C commercial operation
- Direct cascading enables expansion to wider input buses
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Frequently Asked Questions
Is SN74HC165PWR available from LimChip?
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