Overview
The 74LVC257AD,112 is a quad 2-input multiplexer with 3-state outputs, manufactured by NXP Semiconductors (now part of Nexperia). This device is designed to operate in mixed 3.3 V and 5 V environments, making it an ideal choice for applications requiring voltage translation. The 74LVC257AD features Schmitt-trigger action at all inputs, which enhances the circuit's tolerance to slower input rise and fall times.
The device is fully specified for partial power-down applications using IOFF circuitry, which prevents backflow current when the device is powered down. It also boasts overvoltage tolerant inputs up to 5.5 V and a wide supply voltage range from 1.2 V to 3.6 V.
Key Specifications
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|
| 74LVC257AD | 1.2 - 3.6 | CMOS/LVTTL | ± 24 | 2.4 | low | -40 to +125 | 92 | 9.6 | 51.5 | SO16 (SOT109-1) |
Key Features
- Quad 2-input multiplexer with 3-state outputs
- Inputs can be driven from either 3.3 V or 5 V devices, allowing use in mixed voltage environments
- Schmitt-trigger action at all inputs for improved noise immunity
- Overvoltage tolerant inputs up to 5.5 V
- Wide supply voltage range from 1.2 V to 3.6 V
- CMOS low-power consumption
- Direct interface with TTL levels
- Output drive capability suitable for 50 Ω transmission lines at 85 °C
- IOFF circuitry for partial power-down mode operation
- Compliance with JEDEC standards: JESD8-7A, JESD8-5A, JESD8-C/JESD36
- 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 74LVC257AD is versatile and can be used in a variety of applications across different industries, including:
- Automotive systems: For voltage translation and signal routing in mixed voltage environments.
- Industrial control systems: To manage and route signals efficiently.
- Consumer electronics: In devices requiring low power consumption and high reliability.
- Mobile devices: For signal multiplexing and voltage translation.
- Wearable technology: Due to its low power consumption and compact package.
Q & A
- What is the primary function of the 74LVC257AD?
The primary function of the 74LVC257AD is to act as a quad 2-input multiplexer with 3-state outputs, allowing it to select and route signals from multiple inputs to a single output.
- What voltage range can the 74LVC257AD operate within?
The 74LVC257AD can operate within a supply voltage range of 1.2 V to 3.6 V.
- What is the significance of Schmitt-trigger action in the 74LVC257AD?
Schmitt-trigger action at all inputs enhances the circuit's tolerance to slower input rise and fall times, improving noise immunity.
- How does the IOFF circuitry benefit the device?
The IOFF circuitry disables the output when the device is powered down, preventing potentially damaging backflow current.
- What are the ESD protection levels for the 74LVC257AD?
The device has ESD protection exceeding 2000 V for HBM (Human Body Model) and 1000 V for CDM (Charged Device Model).
- What package types are available for the 74LVC257AD?
The 74LVC257AD is available in SO16 (SOT109-1) package among others.
- What are the operating temperature ranges for the 74LVC257AD?
The device is specified to operate from -40 °C to +125 °C.
- Can the 74LVC257AD be used in mixed voltage environments?
Yes, the 74LVC257AD can be used in mixed 3.3 V and 5 V environments due to its 5 V tolerant inputs and outputs.
- What is the output drive capability of the 74LVC257AD?
The output drive capability is suitable for driving 50 Ω transmission lines at 85 °C.
- Is the 74LVC257AD compliant with any industry standards?
Yes, it complies with JEDEC standards: JESD8-7A, JESD8-5A, and JESD8-C/JESD36.
