Overview
The SN74LVCC4245ADWRE4 is an octal dual-supply bus transceiver produced by Texas Instruments. This device is designed for asynchronous communication between data buses and supports voltage translation between 3.3-V and 5-V environments. It features two separate power-supply rails, VCCA and VCCB, allowing for flexible operation in mixed-voltage systems. The device can transmit data from the A bus to the B bus or vice versa, controlled by the direction-control (DIR) input. Additionally, the output-enable (OE) input allows for disabling the device to isolate the buses effectively.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| VCCA Supply Voltage | 4.5 | 5 | 5.5 | V |
| VCCB Supply Voltage | 2.7 | 3.3 | 5.5 | V |
| Operating Free-Air Temperature | -40 | 85 | °C | |
| High-Level Input Voltage (VIHA) | 2 | VCCA | V | |
| Low-Level Output Current (IOLA) | -24 | mA | ||
| Propagation Delay Time (tPHL A to B) | 1 | 7.1 | ns | |
| Junction-to-Ambient Thermal Resistance (θJA) | 100.6 | °C/W |
Key Features
- Octal dual-supply bus transceiver for asynchronous communication between data buses.
- Supports voltage translation between 3.3-V and 5-V environments.
- Two separate power-supply rails (VCCA and VCCB).
- Direction-control (DIR) input to control data transmission direction.
- Output-enable (OE) input to disable the device and isolate the buses.
- Available in various packages including DB (SSOP), DW (SOIC), NS (SOP), and PW (TSSOP).
Applications
- Mixed-voltage system design where data needs to be translated between different voltage levels.
- Asynchronous communication between data buses in various electronic systems.
- Embedded systems, industrial control systems, and other applications requiring voltage-level translation.
Q & A
- What is the primary function of the SN74LVCC4245ADWRE4?
The primary function is to act as an octal dual-supply bus transceiver for asynchronous communication between data buses, supporting voltage translation between 3.3-V and 5-V environments.
- What are the supply voltage ranges for VCCA and VCCB?
VCCA ranges from 4.5 V to 5.5 V, and VCCB ranges from 2.7 V to 5.5 V.
- 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 is used to disable the device, effectively isolating the buses.
- What are the available package types for this device?
The device is available in DB (SSOP), DW (SOIC), NS (SOP), and PW (TSSOP) packages.
- What is the operating free-air temperature range for this device?
The operating free-air temperature range is from -40°C to 85°C.
- What is the typical propagation delay time from A to B?
The typical propagation delay time from A to B is around 1 to 7.1 ns.
- How should the power-up sequence be managed for this device?
The power-up sequence should involve connecting ground before any supply voltage, powering up the control side (VCCA), and ensuring OE and DIR inputs are properly biased to avoid anomalies.
- What are some common applications for this device?
Common applications include mixed-voltage system design, asynchronous communication between data buses, and use in embedded systems and industrial control systems.
- What is the junction-to-ambient thermal resistance for the PW package?
The junction-to-ambient thermal resistance (θJA) for the PW package is approximately 100.6 °C/W.
