Overview
The SN74LVC4245ADWE4, produced by Texas Instruments, is an 8-bit (octal) noninverting bus transceiver designed for asynchronous communication between data buses. This device features two separate supply rails: the B port operates at 3.3 V (VCCB), and the A port operates at 5 V (VCCA), enabling voltage translation between 3.3-V and 5-V environments. The device can transmit data from the A bus to the B bus or from the B bus to the A bus, controlled by the direction-control (DIR) input. Additionally, the output-enable (OE) input allows for disabling the device to isolate the buses effectively. The control circuitry is powered by VCCA.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCCA Supply Voltage Range | -0.5 | 6.5 | V | ||
| VI Input Voltage Range (A Port) | -0.5 | VCCA + 0.5 | V | ||
| VO Output Voltage Range (A Port) | -0.5 | VCCA + 0.5 | V | ||
| Continuous Output Current | ±50 | mA | |||
| Continuous Current Through Each VCCA or GND | ±100 | mA | |||
| Storage Temperature Range | -65 | 150 | °C | ||
| Junction-to-Ambient Thermal Resistance (DB Package) | 90.7 | °C/W | |||
| Junction-to-Ambient Thermal Resistance (PW Package) | 100.6 | °C/W |
Key Features
- Bidirectional Voltage Translation: Enables translation between 3.3-V and 5-V environments.
- High Drive Capability: 24 mA drive at 3-V supply, suitable for heavier loads and longer traces.
- Low VIH Levels: Allows for 3.3-V to 5-V translation.
- ESD Protection: Exceeds JESD 22 – 2000-V Human-Body Model.
- Latch-Up Performance: Exceeds 250 mA per JESD 17.
- 3-State Outputs: Output-enable (OE) input for bus isolation.
- Flexible Packaging: Available in DB (SSOP), DW (SOIC), and PW (TSSOP) packages.
Applications
The SN74LVC4245ADWE4 is suitable for a variety of bus interface applications where output drive or PCB trace length is a concern. It can be used in systems requiring asynchronous communication between data buses operating at different voltage levels. Typical applications include:
- System logic interfaces
- LED drivers
- Data communication systems
- Embedded systems requiring voltage translation
Q & A
- What is the primary function of the SN74LVC4245ADWE4?
The primary function is to act as an 8-bit noninverting bus transceiver with bidirectional voltage translation between 3.3-V and 5-V environments.
- How does the device control data transmission between buses?
Data transmission is controlled by the direction-control (DIR) input and can be disabled using the output-enable (OE) input.
- What are the power supply requirements for the A and B ports?
The A port operates at 5 V (VCCA), and the B port operates at 3.3 V (VCCB).
- What is the maximum continuous output current for each output?
The maximum continuous output current is ±50 mA.
- What type of ESD protection does the device offer?
The device offers ESD protection exceeding JESD 22 – 2000-V Human-Body Model.
- What are the available package options for the SN74LVC4245ADWE4?
The device is available in DB (SSOP), DW (SOIC), and PW (TSSOP) packages.
- How does the device handle latch-up performance?
The device's latch-up performance exceeds 250 mA per JESD 17.
- What is the significance of the high drive capability of the device?
The high drive capability (24 mA at 3-V supply) is beneficial for heavier loads and longer traces.
- Can the device be used in applications requiring asynchronous communication between different voltage levels?
Yes, the device is designed for asynchronous communication between data buses operating at different voltage levels.
- How should unused inputs be handled to ensure proper device operation?
Unused inputs must be held at the associated VCC or GND to ensure proper device operation.
