Overview
The SN74AHC594DRG4 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 low power consumption and high-speed operation. The shift register and storage register have separate clocks (SRCLK and RCLK, respectively) and direct overriding clear inputs (SRCLR and RCLR), allowing for flexible control over data shifting and storage. The device also features a serial output (QH′) for cascading multiple shift registers.
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 | ||
| Maximum Clock Frequency (CL = 50 pF) | 55 | 105 | MHz | |
| Propagation Delay Time (RCLK to QA-QH, CL = 15 pF) | 4.6 | 8 | 8.5 | ns |
| Propagation Delay Time (SRCLK to QH′, CL = 15 pF) | 5.4 | 9.1 | 9.7 | ns |
Key Features
- 8-bit serial-in, parallel-out shift register with an integrated 8-bit D-type storage register.
- Separate clocks for shift and storage registers (SRCLK and RCLK).
- Direct overriding clear inputs for both shift and storage registers (SRCLR and RCLR).
- Serial output (QH′) for cascading purposes.
- Low power consumption and high-speed operation.
- Input voltage tolerance up to 5.5 V.
- Slow edges for reduced noise.
- ESD protection exceeds JESD 22 – 2000V human-body model and 1000V charged-device model.
- Latch-up performance exceeds 100mA per JESD 78, class II.
Applications
- Network Switches
- Power Infrastructures
- PCs and Notebooks
- LED Displays
- Servers
- Pro Audio Mixers
- Elevators and Escalators
- Human Machine Interface (HMI): Industrial
Q & A
- What is the operating voltage range of the SN74AHC594DRG4?
The operating voltage range is from 2V to 5.5V.
- What type of clocks does the SN74AHC594DRG4 have?
The device has separate clocks for the shift register (SRCLK) and the storage register (RCLK), both of which are positive-edge triggered.
- How does the clear function work on the SN74AHC594DRG4?
The device has direct overriding clear inputs for both the shift register (SRCLR) and the storage register (RCLR).
- What is the purpose of the QH′ output?
The QH′ output is provided for cascading multiple shift registers.
- What are the key features of the SN74AHC594DRG4 in terms of noise reduction?
The device features slow edges for reduced noise.
- What is the maximum clock frequency for the SN74AHC594DRG4 with a 50 pF load?
The maximum clock frequency is up to 105 MHz.
- What are the propagation delay times for the SN74AHC594DRG4?
The propagation delay times range from 4.6 ns to 9.7 ns depending on the clock and load conditions.
- What kind of ESD protection does the SN74AHC594DRG4 have?
The device has ESD protection that exceeds JESD 22 – 2000V human-body model and 1000V charged-device model.
- What are some common applications of the SN74AHC594DRG4?
Common applications include network switches, power infrastructures, PCs and notebooks, LED displays, servers, and industrial HMI systems.
- What is the thermal performance of the SN74AHC594DRG4?
The device has a junction-to-ambient thermal resistance (RθJA) that varies depending on the package, with values such as 80.2 °C/W for the SOIC package.
