Overview
The SN74AHC594DBR is an 8-bit serial-in, parallel-out shift register with an integrated 8-bit D-type storage register, manufactured by Texas Instruments. This device is part of the AHC (Advanced High-Speed CMOS) logic family, known for its high speed and low power consumption. It operates within a voltage range of 2V to 5.5V, making it versatile for various applications. The shift register and storage register have separate clocks (SRCLK and RCLK) and direct overriding clear inputs (SRCLR and RCLR), allowing for flexible control over data shifting and storage. A serial output (QH′) is provided for cascading multiple devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage Range | 2 | 5.5 | V | |
| Operating Free-Air Temperature | -40 | 125 | °C | |
| Input Voltage Range | -0.5 | 7 | V | |
| Output Voltage Range | -0.5 | VCC + 0.5 | V | |
| Continuous Output Current | ±25 | mA | ||
| High-Level Output Current (VCC = 5V) | -8 | mA | ||
| Low-Level Output Current (VCC = 5V) | 8 | mA | ||
| Pulse Duration RCLK or SRCLK High or Low | 5 | 5 | ns | |
| Setup Time SER before SRCLK↑ (VCC = 5V) | 3 | 3 | ns |
Key Features
- 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register.
- Separate clocks for shift and storage registers (SRCLK and RCLK).
- Direct overriding clear inputs for shift and storage registers (SRCLR and RCLR).
- Serial output (QH′) for cascading purposes.
- Operating voltage range: 2V to 5.5V.
- Low power consumption.
- ESD protection exceeds JESD 22 – 2000V human-body model and 1000V charged-device model.
- Inputs tolerant up to 5.5V for down translation.
- Slow edges for reduced noise.
Applications
- Network Switches
- Power Infrastructures
- PCs and Notebooks
- LED Displays
- Servers
Q & A
- What is the operating voltage range of the SN74AHC594DBR?
The operating voltage range is from 2V to 5.5V.
- What type of registers does the SN74AHC594DBR contain?
The device contains an 8-bit serial-in, parallel-out shift register and an 8-bit D-type storage register.
- Does the SN74AHC594DBR have separate clocks for the shift and storage registers?
- What is the purpose of the SRCLR and RCLR inputs?
The SRCLR and RCLR inputs are used for direct overriding clear of the shift and storage registers, respectively.
- What is the maximum continuous output current of the SN74AHC594DBR?
The maximum continuous output current is ±25 mA.
- What is the ESD protection level of the SN74AHC594DBR?
The ESD protection exceeds JESD 22 – 2000V human-body model and 1000V charged-device model.
- Can the inputs of the SN74AHC594DBR handle voltages higher than the VCC?
- What is the purpose of the QH′ output?
The QH′ output is provided for cascading purposes.
- What are some common applications of the SN74AHC594DBR?
- What is the maximum operating free-air temperature of the SN74AHC594DBR?
