Overview
The MC74LVX4245DTR2, 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 systems such as laptop computers that use a 3.3 V CPU and 5.0 V peripheral devices. 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 | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCCA, VCCB DC Supply Voltage | -0.5 | +7.0 | V | ||
| VI DC Input Voltage OE, T/R | -0.5 | VCCA + 0.5 | V | ||
| IO DC Output Source/Sink Current | ±50 | mA | |||
| ICC, IGND DC Supply Current Per Output Pin | ±200 (ICCA), ±100 (ICCB) | mA | |||
| TSTG Storage Temperature Range | -65 | +150 | °C | ||
| TA Operating Free-Air Temperature | -40 | +85 | °C | ||
| tPHL, tPLH Propagation Delay A to B | CL = 50pF | 1.0 | 5.1 | 9.0 | ns |
| tPZL, tPZH Output Enable Time OE to B | CL = 50pF | 1.0 | 6.5 | 10.5 | ns |
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 MC74LVX4245DTR2 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
- Interfaces in laptop computers, PCMCIA controllers, VGA controllers, and other mixed-voltage environments
Q & A
- What is the primary function of the MC74LVX4245DTR2?
The primary function is to act as a dual-supply octal translating transceiver, enabling bidirectional data flow between 5.0 V and 3.0 V buses.
- What are the compatible package types for the MC74LVX4245DTR2?
The device is available in SOIC and TSSOP packages.
- What is the significance of the NLV prefix in the MC74LVX4245DTR2?
The NLV prefix indicates that the device is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other applications requiring unique site and control change requirements.
- How should the VCCB and VCCA pins be powered up to avoid current penalties?
The safest power-up strategy is to power VCCA before VCCB to avoid current penalties.
- What are the maximum output source/sink currents for the 5.0 V and 3.0 V buses?
The outputs can source/sink 24 mA at the 5.0 V bus and 12 mA at the 3.0 V bus.
- Is the MC74LVX4245DTR2 RoHS compliant?
Yes, the device is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What is the operating temperature range for the MC74LVX4245DTR2?
The operating temperature range is from -40°C to +85°C.
- What is the propagation delay from A to B ports?
The propagation delay from A to B ports is typically 5.1 ns with a maximum of 9.0 ns.
- Can the MC74LVX4245DTR2 be used in unidirectional applications?
Yes, the device can be used for both bidirectional and unidirectional applications.
- Why is the MC74LVX4245DTR2 important in mixed-voltage systems?
It prevents damage to 3.0 V devices by translating signals between 3.0 V and 5.0 V buses, avoiding latchup effects and current flow issues.
