Overview
The HEF4557BT is a static clocked serial shift register produced by NXP Semiconductors. This component is highly versatile, allowing its length to be programmed to be any number of bits between 1 and 64. It features a dynamic length control through the use of length control inputs (L1, L2, L4, L8, L16, and L32), enabling flexible configuration based on the application requirements. The register can shift data from either the DA or DB data inputs, selected by the A/B select input, which is useful for recirculation purposes. The HEF4557BT operates within a recommended VDD power supply range of 3 V to 15 V and is specified to function from -40 °C to +85 °C, making it suitable for a wide range of environments and applications.
Key Specifications
| Parameter | Value |
|---|---|
| Type Number | HEF4557BT |
| Package Name | SO16 (SOT109-1) |
| Number of Bits | 1 to 64 |
| Power Supply Range (VDD) | 3 V to 15 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Length Control Inputs | L1, L2, L4, L8, L16, L32 |
| Data Inputs | DA, DB |
| Clock Inputs | CP0, CP1 |
| Master Reset Input | MR |
Key Features
- Fully static operation
- Programmable length between 1 and 64 bits using length control inputs
- Serial data input from DA or DB with A/B select input
- Standardized symmetrical output characteristics
- Complies with JEDEC standard JESD 13-B
- Operates over a wide power supply range (3 V to 15 V)
- Specified from -40 °C to +85 °C
Applications
The HEF4557BT is suitable for various applications requiring flexible and programmable shift register functionality. These include:
- Digital signal processing systems
- Data storage and retrieval systems
- Sequential logic circuits
- Communication systems requiring data serialization and deserialization
- Automotive and industrial control systems where robustness and flexibility are essential
Q & A
- What is the HEF4557BT? The HEF4557BT is a static clocked serial shift register that can be programmed to be any number of bits between 1 and 64.
- What is the power supply range for the HEF4557BT? The HEF4557BT operates within a recommended VDD power supply range of 3 V to 15 V.
- How is the length of the shift register programmed? The length is programmed using the length control inputs (L1, L2, L4, L8, L16, L32).
- What are the data input options for the HEF4557BT? The register can shift data from either the DA or DB data inputs, selected by the A/B select input.
- What is the operating temperature range for the HEF4557BT? The component is specified to function from -40 °C to +85 °C.
- What package type is the HEF4557BT available in? The HEF4557BT is available in the SO16 (SOT109-1) package.
- How does the master reset function work? A HIGH on the master reset (MR) input resets the register and forces Q to LOW and Q to HIGH, independent of the other inputs.
- What are some common applications for the HEF4557BT? Common applications include digital signal processing, data storage and retrieval, sequential logic circuits, communication systems, and automotive and industrial control systems.
- Does the HEF4557BT comply with any industry standards? Yes, it complies with the JEDEC standard JESD 13-B.
- How do the clock inputs work? Data is shifted into the first register position and all the data in the register is shifted one position to the right on the LOW to HIGH transition of CP0 while CP1 is LOW or on the HIGH to LOW transition of CP1 while CP0 is HIGH.
