Overview
The 74AHCT595PW is an 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs, manufactured by Nexperia USA Inc. This device is part of the 74AHCT series, which operates with TTL-compatible input levels. It features separate clocks for both the shift and storage registers, enabling flexible data transfer and storage. The device includes a serial input (DS) and a serial output (Q7S) for cascading, as well as an asynchronous reset input (MR). The output enable input (OE) allows the outputs to be set to a high-impedance OFF-state when necessary. This component is widely used in various electronic designs due to its versatility and robust performance characteristics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Type Number | 74AHCT595PW | - |
| Logic Switching Levels | TTL | - |
| Supply Voltage (VCC) | 4.5 - 5.5 | V |
| Output Drive Capability | ± 8 | mA |
| Propagation Delay (tpd) | 3.8 | ns |
| Maximum Frequency (fmax) | 170 | MHz |
| Number of Bits | 8 | - |
| Power Dissipation Considerations | Low | - |
| Ambient Temperature (Tamb) | -40 to +125 | °C |
| Package Name | TSSOP16 (SOT403-1) | - |
Key Features
- 8-bit Serial-in/Serial or Parallel-out Shift Register: Allows for both serial and parallel data output.
- Separate Clocks: The shift and storage registers have separate clocks, enabling one clock pulse ahead of the other when connected together.
- 3-state Outputs: Outputs can be set to a high-impedance OFF-state using the output enable input (OE).
- Asynchronous Reset: The shift register can be reset using the MR input.
- Cascading Capability: Serial input (DS) and serial output (Q7S) enable cascading of multiple devices.
- Overvoltage Tolerant Inputs: Inputs are tolerant up to 5.5 V, making it suitable for mixed voltage environments.
- High Noise Immunity: Features Schmitt-trigger action on all inputs.
- Low Power Dissipation: CMOS low power dissipation characteristics.
- ESD Protection: HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V.
Applications
The 74AHCT595PW is versatile and can be used in a variety of applications across different industries, including:
- Automotive Systems: For data storage and transfer in automotive control units.
- Industrial Control Systems: In automation and control systems requiring serial-to-parallel data conversion.
- Consumer Electronics: In devices such as remote controls, display drivers, and other consumer electronic products.
- Computing and Networking: For data buffering and storage in computing and networking equipment.
- Mobile and Wearable Devices: In mobile and wearable devices requiring efficient data handling.
Q & A
- What is the primary function of the 74AHCT595PW?
The primary function of the 74AHCT595PW is to act as an 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs.
- What are the logic switching levels of the 74AHCT595PW?
The 74AHCT595PW operates with TTL-compatible input levels.
- What is the supply voltage range for the 74AHCT595PW?
The supply voltage range is from 4.5 V to 5.5 V.
- How many bits can the 74AHCT595PW handle?
The 74AHCT595PW can handle 8 bits of data.
- What is the maximum frequency of operation for the 74AHCT595PW?
The maximum frequency of operation is 170 MHz.
- What type of package does the 74AHCT595PW come in?
The 74AHCT595PW comes in a TSSOP16 (SOT403-1) package.
- Does the 74AHCT595PW have ESD protection?
Yes, it has ESD protection with HBM exceeding 2000 V and CDM exceeding 1000 V.
- Can the 74AHCT595PW be used in mixed voltage environments?
Yes, the inputs are overvoltage tolerant up to 5.5 V, making it suitable for mixed voltage environments.
- How does the asynchronous reset work on the 74AHCT595PW?
The shift register can be reset using the MR input, which resets the shift register when set to LOW.
- What is the significance of the output enable input (OE) on the 74AHCT595PW?
The output enable input (OE) allows the outputs to be set to a high-impedance OFF-state when set to HIGH.
