Overview
The SN74AHC594PW 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 SN74AHC594PW operates within a voltage range of 2V to 5.5V, making it versatile for various applications. It features separate clocks for the shift and storage registers, along with direct overriding clear inputs, which enhance its functionality and control.
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) | 50 | - | - | MHz |
| Propagation Delay Time (RCLK QA – QH, CL = 50 pF, VCC = 5V) | 6.9 | - | 11.1 | 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.
- Direct overriding clear inputs (SRCLR, RCLR) for both shift and storage registers.
- Serial output (QH′) for cascading purposes.
- Positive-edge triggered clocks.
- Input voltage tolerance up to 5.5V.
- Low power consumption.
- 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 SN74AHC594PW?
The operating voltage range is from 2V to 5.5V.
- What type of shift register does the SN74AHC594PW contain?
It contains an 8-bit serial-in, parallel-out shift register.
- Does the SN74AHC594PW have separate clocks for the shift and storage registers?
Yes, it has separate clocks for the shift and storage registers.
- What is the purpose of the SRCLR and RCLR inputs?
These inputs are for direct overriding clear of the shift and storage registers, respectively.
- What is the maximum clock frequency for the SN74AHC594PW with a load capacitance of 50 pF at VCC = 5V?
The maximum clock frequency is 50 MHz.
- What is the propagation delay time from RCLK to QA – QH with a load capacitance of 50 pF at VCC = 5V?
The propagation delay time is between 6.9 ns and 11.1 ns.
- Does the SN74AHC594PW have ESD protection?
Yes, it exceeds JESD 22 – 2000V human-body model and 1000V charged-device model.
- What are some common applications of the SN74AHC594PW?
Common applications include network switches, power infrastructures, PCs and notebooks, LED displays, and servers.
- What is the thermal resistance (RθJA) for the SN74AHC594PW in a D package?
The junction-to-ambient thermal resistance (RθJA) is approximately 80.2 °C/W.
- Can the inputs of the SN74AHC594PW be driven above VCC?
No, inputs should not be driven above VCC, but they are tolerant up to 5.5V.
