Overview
The SN74AHC594PWRG4 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. The SN74AHC594PWRG4 features separate clocks for the shift and storage registers, allowing for independent control over data shifting and storage. It also includes direct overriding clear inputs for both the shift and storage registers, enhancing its versatility in various applications.
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 | mA |
| High-Level Output Current (VCC = 5 V) | - | - | -8 | mA |
| Low-Level Output Current (VCC = 5 V) | - | - | 8 | mA |
| Maximum Clock Frequency (CL = 50 pF, VCC = 5 V) | - | - | 55 | MHz |
| Propagation Delay Time (RCLK to QA-QH, CL = 50 pF, VCC = 5 V) | - | - | 11.1 | ns |
Key Features
- 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register
- Independent 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
- Operating voltage range from 2 V to 5.5 V
- Low power consumption and high speed
- ESD protection exceeds JESD 22 – 2000V human-body model and 1000V charged-device model
- Slow edges for reduced noise
- Inputs tolerant up to 5.5 V for down translation
Applications
- Network Switches
- Power Infrastructures
- PCs and Notebooks
- LED Displays
- Servers
Q & A
- What is the operating voltage range of the SN74AHC594PWRG4?
The operating voltage range is from 2 V to 5.5 V.
- What type of clocks does the SN74AHC594PWRG4 have?
The device has separate clocks for the shift register (SRCLK) and the storage register (RCLK), both of which are positive-edge triggered.
- How can the shift and storage registers be cleared?
The shift and storage registers can be cleared using the direct overriding clear inputs (SRCLR and RCLR).
- What is the purpose of the QH′ output?
The QH′ output is provided for cascading purposes, allowing multiple devices to be connected in series.
- What is the maximum clock frequency for the SN74AHC594PWRG4?
The maximum clock frequency is up to 55 MHz with a load capacitance of 50 pF at VCC = 5 V.
- Does the SN74AHC594PWRG4 have ESD protection?
Yes, it exceeds JESD 22 – 2000V human-body model and 1000V charged-device model for ESD protection.
- What are some common applications of the SN74AHC594PWRG4?
Common applications include network switches, power infrastructures, PCs and notebooks, LED displays, and servers.
- How does the SN74AHC594PWRG4 reduce noise?
The device features slow edges to reduce noise.
- Are the inputs of the SN74AHC594PWRG4 tolerant to higher voltages?
Yes, the inputs are tolerant up to 5.5 V for down translation.
- What is the propagation delay time for the SN74AHC594PWRG4?
The propagation delay time from RCLK to QA-QH is up to 11.1 ns with a load capacitance of 50 pF at VCC = 5 V.
