Overview: SN74HC595D Serial-In Parallel-Out Shift Register
"(《世界人权宣言》) SN74HC595D by 德州仪器 is a high-speed CMOS shift register featuring serial input, a storage register, and 3-state parallel outputs. It??s optimized for reducing microcontroller I/O pin usage by allowing data to be shifted in serially and output in parallel. Commonly used in LED display drivers, this IC enhances design flexibility in embedded and automation systems.
With wide voltage support and low power consumption, SN74HC595D fits seamlessly into logic-level diverse environments. Whether you??re expanding GPIO pins or creating multiplexed systems, its small-form SOIC-16 package ensures easy surface-mount integration.
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Electrical Characteristics and Timing
| 参数 | Min | Max | 单位 |
|---|---|---|---|
| 电源电压（VCC) | 2.0 | 6.0 | V |
| High-Level Input Voltage (VIH) | 0.7 ?? VCC | ?C | V |
| Low-Level Input Voltage (VIL) | ?C | 0.3 ?? VCC | V |
| 最大时钟频率 | ?C | 25 | 兆赫 |
Why SN74HC595D Excels Among Output Expanders
This serial-in parallel-out shift register stands out for its built-in latch and tri-state outputs, which allow stable output control even during shifting. Unlike basic shift registers, the SN74HC595D supports cascaded configurations for chaining multiple registers, enabling up to 64-bit control using just a few MCU lines.
Its compact SOIC-16 surface-mount package allows engineers to efficiently manage board space, especially in constrained environments like LED signage, sensor readouts, or keypad interfaces. Designers trust its stable switching performance and seamless compatibility with modern digital logic levels. Endorsed by many embedded systems experts, the SN74HC595D is a go-to solution stocked by 集成电路制造商 for robust and scalable I/O expansion.
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Technical Parameters and Features
| 特点 | Details |
|---|---|
| 功能 | Serial-In, Parallel-Out Shift Register |
| Number of Bits | 8 |
| Logic Type | High-Speed CMOS |
| 电压范围 | 2V to 6V |
| 最大时钟频率 | 25 MHz |
| 输出类型 | 3-State Parallel |
| Integrated Latch | 是 |
| 包装 | SOIC-16 |
| Cascade Capability | Yes, via serial out |
| Input Compatibility | TTL and CMOS |
典型应用
- LED matrix and segment display control
- Microcontroller GPIO expansion
- Digital signal multiplexing systems
- Remote keypad or switch decoding
常见问题（FAQ）
What is the core function of the SN74HC595D?
It converts serial data into parallel outputs, ideal for expanding microcontroller I/O using minimal pins and controlling multiple outputs like LEDs or relays.
Is the SN74HC595D suitable for daisy-chaining multiple units?
Yes, it supports cascaded configurations through QH?? output, enabling serial data flow through multiple devices for extended parallel output chains.
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Does the SOIC-16 package affect thermal performance?
The SOIC-16 is thermally efficient for typical applications. Proper PCB layout and thermal relief can ensure stability even at high switching frequencies.
How does the latch function improve data integrity?
The internal latch captures the shifted data before outputting, preventing glitches and maintaining output stability during the shifting process.
Can it interface with 3.3V microcontrollers?
Yes, it operates down to 2V, making it fully compatible with 3.3V logic systems. Ensure level matching if cascading with 5V logic.
