Overview
The SN74LVC4245ADWR is an 8-bit (octal) noninverting bus transceiver produced by Texas Instruments. This device is designed for asynchronous communication between data buses and features two separate supply rails: the B port operates at 3.3 V (VCCB), and the A port operates at 5 V (VCCA). This configuration allows for voltage translation from a 3.3-V to a 5-V environment and vice versa. 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 can disable the device, effectively isolating the buses. The control circuitry is powered by VCCA.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Bits | 8 | - |
| Supply Voltage (A Port) | 5 V | V |
| Supply Voltage (B Port) | 3.3 V | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | SOIC (DW) | - |
| Number of Pins | 24 | - |
| Propagation Delay Time (Max) | 6.3 ns | ns |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | V |
Key Features
- Bidirectional voltage translator between 3.3-V and 5-V environments.
- Control inputs (DIR, OE) referenced to VCCA voltage.
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds JESD 22 standards (2000-V Human-Body Model, 1000-V Charged-Device Model).
- Output-enable (OE) input to disable the device and isolate the buses).
Applications
- Asynchronous communication between data buses in mixed-voltage systems).
- Systems requiring voltage translation between 3.3-V and 5-V components).
- Cable modem termination systems, servers, and LED displays).
Q & A
- What is the primary function of the SN74LVC4245ADWR?
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).
- What are the supply voltages for the A and B ports?
The A port operates at 5 V (VCCA), and the B port operates at 3.3 V (VCCB)).
- How is the direction of data transmission controlled?
The direction of data transmission is controlled by the direction-control (DIR) input).
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can be used to disable the device, effectively isolating the buses).
- What is the operating temperature range of the SN74LVC4245ADWR?
The operating temperature range is -40°C to 85°C).
- What type of package does the SN74LVC4245ADWR come in?
The device comes in a SOIC (DW) package with 24 pins).
- What is the maximum propagation delay time for this device?
The maximum propagation delay time is approximately 6.3 ns).
- What level of ESD protection does the SN74LVC4245ADWR offer?
The device offers ESD protection exceeding JESD 22 standards (2000-V Human-Body Model, 1000-V Charged-Device Model)).
- What are some common applications for the SN74LVC4245ADWR?
Common applications include asynchronous communication between data buses in mixed-voltage systems, cable modem termination systems, servers, and LED displays).
- How should the power-up sequence be managed for this device?
A proper power-up sequence should be followed to avoid excessive supply current, bus contention, oscillations, or other anomalies. This includes connecting ground before any supply voltage and powering up the control side of the device (VCCA) first).
