Overview
The 74HC595D is an 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs, manufactured by Nexperia. This device is part of the 74HC/HCT595 series and is widely used in various electronic designs for its versatility in data shifting and storage. It features separate clocks for both the shift and storage registers, enabling precise control over data transfer.
Key Specifications
| Parameter | Value |
|---|---|
| Type number | 74HC595D |
| VCC (V) | 2.0 - 6.0 |
| Logic switching levels | CMOS |
| Output drive capability (mA) | ± 7.8 |
| tpd (ns) | 16 |
| fmax (MHz) | 108 |
| Number of bits | 8 |
| Power dissipation considerations | Low |
| Tamb (°C) | -40 to 125 |
| Package name | SO16 (SOT109-1) |
Key Features
- 8-bit serial input and 8-bit serial or parallel output
- Storage register with 3-state outputs
- Shift register with direct clear (asynchronous reset MR input)
- 100 MHz (typical) shift out frequency
- ESD protection: HBM ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
- Inputs include clamp diodes for interfacing with voltages in excess of VCC
Applications
The 74HC595D is suitable for a wide range of applications, including automotive, industrial, mobile, and consumer electronics. It is particularly useful in systems requiring serial-to-parallel data conversion, such as LED drivers, display drivers, and other digital control systems.
Q & A
- What is the primary function of the 74HC595D? The primary function is to act as an 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs.
- What are the logic switching levels for the 74HC595D? The logic switching levels are CMOS.
- What is the maximum shift out frequency of the 74HC595D? The maximum shift out frequency is typically 100 MHz.
- How does the asynchronous reset MR input work? A LOW on the MR input will reset the shift register.
- What type of ESD protection does the 74HC595D have? The device has HBM ANSI/ESDA/JEDEC JS-001 class 2 exceeding 2000 V and CDM ANSI/ESDA/JEDEC JS-002 class C3 exceeding 1000 V ESD protection.
- What is the operating temperature range for the 74HC595D? The operating temperature range is -40 to 125°C.
- What package options are available for the 74HC595D? The device is available in SO16 (SOT109-1) package.
- How does the output enable input (OE) affect the outputs? A HIGH on the OE input causes the outputs to assume a high-impedance OFF-state.
- Can the inputs of the 74HC595D be interfaced with voltages in excess of VCC? Yes, the inputs include clamp diodes that enable the use of current limiting resistors to interface with voltages in excess of VCC.
- What are some common applications of the 74HC595D? Common applications include automotive, industrial, mobile, and consumer electronics, particularly in systems requiring serial-to-parallel data conversion.
