Overview
The MC74LVX4245DTR2G, produced by onsemi, is a dual-supply octal translating transceiver designed to interface between 5.0 V and 3.0 V buses in mixed-voltage environments. This device is particularly useful in applications such as laptop computers, where a 3.3 V CPU and 5.0 V peripheral devices coexist. The transceiver allows for bidirectional data flow between the two voltage levels, making it an essential component for managing voltage differences in modern electronic systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| DC Supply Voltage (VCCA, VCCB) | −0.5 | 7.0 | V | |
| Input Voltage (OE, T/R) | −0.5 | VCCA + 0.5 | V | |
| Output Source/Sink Current at 5.0 V Bus | 24 mA | mA | ||
| Output Source/Sink Current at 3.0 V Bus | 12 mA | mA | ||
| Propagation Delay A to B | 1.0 | 5.1 | 9.0 | ns |
| Propagation Delay B to A | 1.0 | 5.4 | 9.0 | ns |
| Operating Temperature Range | −40 | 85 | °C | |
| Package Type | TSSOP-24 |
Key Features
- Bi-directional interface between 5.0 V and 3.0 V buses
- Control inputs compatible with TTL level
- Outputs source/sink 24 mA at 5.0 V bus and 12 mA at 3.0 V bus
- Guaranteed simultaneous switching noise level and dynamic threshold performance
- Available in SOIC and TSSOP packages
- Functionally compatible with the 74 Series 245
- NLV prefix for automotive and other applications requiring unique site and control change requirements; AEC-Q100 qualified and PPAP capable
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
The MC74LVX4245DTR2G is ideal for mixed-voltage applications such as:
- Notebook computers using a 3.3 V CPU and 5.0 V peripheral devices
- Mixed mode dual supply interface solutions where CMOS devices cannot tolerate I/O levels above their applied VCC
- Systems requiring bidirectional or unidirectional data flow between different voltage levels
- Automotive and industrial applications requiring robust voltage translation and compliance with automotive standards
Q & A
- What is the primary function of the MC74LVX4245DTR2G?
The primary function is to provide a bi-directional interface between 5.0 V and 3.0 V buses in mixed-voltage environments.
- What are the compatible package types for the MC74LVX4245?
The device is available in SOIC-24 and TSSOP-24 packages.
- What is the maximum output source/sink current at 5.0 V and 3.0 V buses?
The maximum output source/sink current is 24 mA at 5.0 V and 12 mA at 3.0 V.
- What is the recommended operating temperature range for the MC74LVX4245?
The recommended operating temperature range is from −40°C to +85°C.
- Is the MC74LVX4245 compatible with automotive standards?
- How should the VCCB and VCCA pins be powered up to avoid current issues?
The safest power-up strategy is to power VCCA before VCCB to avoid current penalties.
- What is the propagation delay for data flow from A to B and B to A?
The propagation delay is typically around 5.1 ns for A to B and 5.4 ns for B to A.
- Is the MC74LVX4245 RoHS compliant?
- Can the MC74LVX4245 be used in both bidirectional and unidirectional applications?
- What are the key benefits of using the MC74LVX4245 in mixed-voltage systems?
The key benefits include preventing latchup effects, reducing speed degradation, and minimizing power dissipation by providing a dedicated interface between different voltage levels.
