Overview
The SN74AHC594DG4 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 and direct overriding clear inputs, 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 |
| High-Level Output Current (VCC = 5V) | -8 | - | - | mA |
| Low-Level Output Current (VCC = 5V) | 8 | - | - | mA |
| Maximum Clock Frequency (CL = 50 pF, VCC = 5V) | 55 | - | - | MHz |
| Propagation Delay Time (RCLK to QA-QH, CL = 50 pF, VCC = 5V) | 6.9 | - | 10.5 | ns |
Key Features
- 8-bit serial-in, parallel-out shift register with an integrated 8-bit D-type storage register.
- Separate clocks for shift and storage registers (SRCLK and RCLK).
- Direct overriding clear inputs for shift and storage registers (SRCLR and RCLR).
- Serial output (QH′) for cascading purposes.
- Inputs tolerant up to 5.5V, allowing for down translation.
- Low power consumption and 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
Q & A
- What is the operating voltage range of the SN74AHC594DG4?
The operating voltage range is from 2V to 5.5V.
- What type of shift register does the SN74AHC594DG4 contain?
It contains an 8-bit serial-in, parallel-out shift register.
- Does the SN74AHC594DG4 have separate clocks for the shift and storage registers?
- What is the purpose of the QH′ output?
The QH′ output is provided for cascading purposes.
- What is the maximum clock frequency for the SN74AHC594DG4 with a load capacitance of 50 pF at VCC = 5V?
The maximum clock frequency is 55 MHz.
- What are the ESD protection ratings for the SN74AHC594DG4?
ESD protection exceeds JESD 22 – 2000V human-body model and 1000V charged-device model.
- What is the latch-up performance of the SN74AHC594DG4?
The latch-up performance exceeds 100mA per JESD 78, class II.
- What are some typical applications of the SN74AHC594DG4?
Typical applications include network switches, power infrastructures, PCs and notebooks, LED displays, and servers.
- How should unused inputs be handled on the SN74AHC594DG4?
Unused inputs must be held at VCC or GND to ensure proper device operation.
- What is the recommended operating free-air temperature range for the SN74AHC594DG4?
The recommended operating free-air temperature range is from -40°C to 125°C.
