Overview
The SN74AHC594D 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 Range | -40 | - | 125 | °C |
| Input Voltage Range | -0.5 | - | 7 | V |
| Output Voltage Range | -0.5 | - | VCC + 0.5 | V |
| Continuous Output Current | -25 | - | 25 | mA |
| High-Level Output Current (VCC = 5V) | -8 | - | -8 | mA |
| Low-Level Output Current (VCC = 5V) | 8 | - | 8 | mA |
| Maximum Clock Frequency (CL = 50 pF, VCC = 5V) | 50 | - | 105 | MHz |
| Setup Time (SER before SRCLK↑, VCC = 5V) | 3 | - | 3 | ns |
| Hold Time (Data after CLK↑, VCC = 5V) | 1.5 | - | 1.5 | ns |
Key Features
- 8-bit serial-in, parallel-out shift register with an integrated 8-bit D-type storage register.
- Separate clocks for shift (SRCLK) and storage (RCLK) registers.
- Direct overriding clear inputs (SRCLR and RCLR) for both shift and storage registers.
- 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 SN74AHC594D?
The operating voltage range is from 2V to 5.5V.
- What type of registers does the SN74AHC594D contain?
The device contains an 8-bit serial-in, parallel-out shift register and an 8-bit D-type storage register.
- Are there separate clocks for the shift and storage registers?
- What is the purpose of the QH′ output?
The QH′ output is provided for cascading multiple devices.
- What is the maximum clock frequency for the SN74AHC594D with a 50 pF load at VCC = 5V?
The maximum clock frequency is up to 105 MHz.
- What is the setup time for the SER input before the SRCLK↑ at VCC = 5V?
The setup time is 3 ns.
- What is the hold time for data after the CLK↑ at VCC = 5V?
The hold time is 1.5 ns.
- Does the SN74AHC594D have ESD protection?
- What are some common applications for the SN74AHC594D?
Common applications include network switches, power infrastructures, PCs and notebooks, LED displays, and servers.
- How does the SN74AHC594D handle input voltages above its operating range?
The inputs are tolerant up to 5.5V for down translation.
