The Texas Instruments SN74HC595DR is a high-speed 8-bit serial-in, parallel-out shift register designed to expand digital output capability while using only a small number of MCU or processor control pins.
The device contains an 8-bit shift register connected to an 8-bit D-type storage register. Serial data is shifted into the device through the SER input, while the storage register allows updated data to be transferred to the eight parallel outputs simultaneously.
The shift register and storage register use separate clock inputs, allowing serial data to be loaded without immediately changing the output state. After the required 8-bit data has been shifted in, a storage-register clock pulse updates all parallel outputs together.
SN74HC595DR provides 3-state outputs, allowing its output pins to enter a high-impedance state through the OE control input. This feature is useful in shared-bus systems and applications where multiple devices may connect to the same signal lines.
A dedicated SRCLR direct-clear input allows the shift-register contents to be reset. The serial output can also be used to cascade multiple SN74HC595 devices, enabling expansion to 16, 24, 32 or more parallel outputs while maintaining a simple serial interface.
The device operates across a wide 2V to 6V supply range and supports clock frequencies up to 24MHz. At a 5V supply, it provides approximately ±6mA output drive capability, making it suitable for logic-level control and various digital-interface applications.
The SN74HC595DR is supplied in a 16-pin SOIC (D) surface-mount package. The R suffix indicates large tape-and-reel packaging for automated SMT assembly.
Key Features
- Manufacturer: Texas Instruments / TI
- Part Number: SN74HC595DR
- Product Type: Shift Register
- Logic Family: HC
- Configuration: Serial-In / Parallel-Out
- Number of Bits: 8
- Integrated 8-Bit Storage Register
- Output Type: 3-State
- Supply Voltage: 2V to 6V
- Maximum Clock Frequency: 24MHz
- Typical Propagation Delay: 13ns
- Output Drive: ±6mA at 5V
- Maximum Supply Current: 80uA
- Maximum Input Current: 1uA
- Separate Shift and Storage Clocks
- Direct Shift-Register Clear
- Output Enable Control
- Serial Output for Cascading
- Balanced Outputs
- CMOS Inputs
- Operating Temperature: -40°C to +85°C
- Package: SOIC-16
- Package Code: D
- Mounting Type: Surface Mount
- Packaging: Tape & Reel
- Standard Reel Quantity: 2500 pcs
- Product Status: Active
Typical Applications
- MCU I/O Expansion
- LED Control Circuits
- Digital Display Control
- Relay Control Interfaces
- Industrial Control Boards
- Embedded Systems
- Digital Logic Expansion
- Indicator Panels
- Sequential Control Circuits
- Consumer Electronics
- Communication Equipment
- General Digital Electronics
The SN74HC595DR is suitable for designs requiring a simple and efficient method of converting serial data into eight parallel digital outputs, especially where MCU GPIO resources are limited.
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