Overview
The 74HC257DB118, produced by NXP Semiconductors (now Nexperia), is a quad 2-input multiplexer with 3-state outputs. This integrated circuit is part of the 74HC series, known for its high-speed CMOS logic. The device is designed to select one of two 4-bit nibbles and present the selected data at the output in a non-inverted form. It is widely used in digital systems where data selection and routing are necessary.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | - | 2.0 | - | 6.0 | V |
| Operating Temperature | - | -40 | - | 125 | °C |
| High-Level Input Voltage (VIH) | VCC = 2.0 V | 1.5 | - | 1.5 | V |
| Low-Level Input Voltage (VIL) | VCC = 2.0 V | - | 0.5 | 0.8 | V |
| Propagation Delay (tpd) | VCC = 4.5 V; CL = 15 pF | 13 | - | - | ns |
| Enable Time (ten) | VCC = 4.5 V | 15 | - | 30 | ns |
| Disable Time (tdis) | VCC = 4.5 V | 15 | - | 30 | ns |
| Input Capacitance (CI) | - | - | 3.5 | - | pF |
Key Features
- Wide Supply Voltage Range: From 2.0 V to 6.0 V, making it versatile for various applications.
- CMOS Low Power Dissipation: Low power consumption, suitable for battery-powered devices.
- High Noise Immunity: Ensures reliable operation in noisy environments.
- Latch-Up Performance: Exceeds 100 mA per JESD 78 Class II Level B.
- Compliance with JEDEC Standards: Complies with JESD8C (2.7 V to 3.6 V) and JESD7A (2.0 V to 6.0 V).
- 3-State Outputs: Outputs can be set to high impedance, allowing direct interface with system buses.
- Input Levels: Compatible with CMOS (74HC257) and TTL (74HCT257) input levels.
- ESD Protection: Human Body Model (HBM) exceeds 2000 V and Charged Device Model (CDM) exceeds 1000 V.
Applications
- Data Routing and Selection: In digital systems where multiple data sources need to be routed to a single output.
- Bus Systems: For interfacing with system buses due to its 3-state output capability.
- Embedded Systems: In microcontroller and microprocessor-based systems for data multiplexing.
- Communication Systems: In telecommunications and networking equipment for signal routing.
- Industrial Control Systems: For controlling and routing signals in industrial automation.
Q & A
- What is the 74HC257DB118 used for?
The 74HC257DB118 is a quad 2-input multiplexer with 3-state outputs, used for selecting and routing data in digital systems.
- What is the supply voltage range of the 74HC257DB118?
The supply voltage range is from 2.0 V to 6.0 V.
- What are the input levels compatible with the 74HC257DB118?
The inputs are compatible with CMOS (74HC257) and TTL (74HCT257) levels.
- What is the propagation delay of the 74HC257DB118?
The propagation delay is approximately 13 ns at VCC = 4.5 V and CL = 15 pF.
- Does the 74HC257DB118 have ESD protection?
- What are the operating temperature ranges for the 74HC257DB118?
The operating temperature ranges are from -40 °C to +85 °C and from -40 °C to +125 °C.
- What is the purpose of the 3-state outputs in the 74HC257DB118?
The 3-state outputs allow the device to interface directly with system buses by setting the outputs to high impedance.
- How does the Select input work in the 74HC257DB118?
The Select input determines which nibble (A or B) is transferred to the outputs. A low level selects the A inputs, and a high level selects the B inputs.
- What is the function of the Output Enable input in the 74HC257DB118?
The Output Enable input allows the selected input data to be presented at the outputs when low and forces the outputs into the high-impedance state when high.
- Is the 74HC257DB118 compliant with any industry standards?
