Overview
The 74HC257DB,112, produced by Nexperia USA Inc., is a quad 2-input multiplexer with 3-state outputs. This component is part of the 74HC257 and 74HCT257 series, which are high-speed Si-gate CMOS devices. The 74HC257DB,112 is specifically designed to select 4 bits of data from two sources, controlled by a common data select input (S). Although this particular part number is obsolete and no longer manufactured, it remains relevant for understanding and replacing with compatible alternatives.
Key Specifications
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Package name |
|---|---|---|---|---|---|---|---|
| 74HC257DB | 2.0 - 6.0 | CMOS | ± 7.8 | 11 | low | -40~125 | SSOP16 (SOT338-1) |
Key Features
- Non-inverting data path: The data appears at the outputs in true (non-inverting) form from the selected inputs.
- 3-state outputs: The outputs interface directly with the system bus and can be forced to a high-impedance OFF-state when the output enable input (OE) is HIGH.
- Wide supply voltage range: Operates from 2.0 V to 6.0 V for the 74HC257 series.
- CMOS low power dissipation: Low power consumption, making it suitable for energy-efficient designs.
- High noise immunity: Enhanced noise immunity due to CMOS technology.
- ESD protection: High ESD protection levels, exceeding 2000 V for HBM and 200 V for MM.
- Multiple package options: Available in various packages including SSOP16, SO16, and TSSOP16.
Applications
The 74HC257 and 74HCT257 series find applications across various industries, including:
- Automotive: Used in automotive systems for data multiplexing and demultiplexing.
- Industrial: Suitable for industrial control systems and data processing.
- Consumer electronics: Used in consumer devices such as mobile and wearable electronics.
- Computing and power systems: Applied in computing and power management systems for efficient data handling).
Q & A
- What is the 74HC257DB,112 used for?
The 74HC257DB,112 is a quad 2-input multiplexer with 3-state outputs, used for selecting 4 bits of data from two sources based on a common data select input).
- What are the logic switching levels for the 74HC257 series?
The logic switching levels for the 74HC257 series are CMOS levels).
- What is the output drive capability of the 74HC257DB,112?
The output drive capability is ± 7.8 mA).
- What is the propagation delay (tpd) for the 74HC257 series?
The propagation delay is approximately 11 ns).
- What are the operating temperature ranges for the 74HC257DB,112?
The operating temperature range is from -40°C to 125°C).
- Is the 74HC257DB,112 still in production?
No, the 74HC257DB,112 is obsolete and no longer manufactured).
- What are some possible substitutes for the 74HC257DB,112?
Substitutes include parts like the SN74HC157DBR from Texas Instruments).
- What type of ESD protection does the 74HC257 series offer?
The 74HC257 series offers ESD protection exceeding 2000 V for HBM and 200 V for MM).
- What are the package options available for the 74HC257 series?
The 74HC257 series is available in SSOP16, SO16, and TSSOP16 packages).
- Does the 74HC257 series comply with any specific standards?
Yes, it complies with JEDEC standards and has high noise immunity and latch-up performance).
