Overview
The SN74AVC4T245PWTG4, produced by Texas Instruments, is a 4-bit noninverting bus transceiver designed for bidirectional voltage translation between two data buses. This device features a fully configurable dual-rail design, allowing each port to operate over a wide power-supply range from 1.2V to 3.6V. This makes it an excellent choice for translating between various low-voltage nodes such as 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. The device is optimized for high-speed translation and supports partial-power-down mode operation, preventing backflow current through the I/O output circuits when the device is powered down.
Key Specifications
| Parameter | Min | Max | Unit | Description |
|---|---|---|---|---|
| VCCA/VCCB Supply Voltage Range | 1.2 | 3.6 | V | Power supply voltage range for both A and B ports |
| VI Input Voltage Range | -0.5 | 4.6 | V | Input voltage range for I/O ports and control inputs |
| TA Operating Free-Air Temperature | -40 | 85 | °C | Operating temperature range |
| Δt/Δv Input Transition Rise or Fall Rate | 5 | ns/V | Maximum input transition rate | |
| CpdA (A to B Outputs Enabled) | Varies with VCCA/VCCB | pF | Power dissipation capacitance | |
| tPZL, tPHZ, tPLZ, tPHZ OE | Varies with VCCA/VCCB | Varies with VCCA/VCCB | ns | Output enable and disable times |
Key Features
- Fully Configurable Dual-Rail Design: Each port can operate over the full 1.2V to 3.6V power-supply range, allowing for universal low-voltage bidirectional translation.
- High-Speed Translation: Supports high data rate applications, with translated signal data rates up to 380Mbps when translating from 1.8V to 3.3V.
- Partial-Power-Down Mode Operation: Ioff circuitry prevents backflow current through the I/O output circuits when the device is powered down.
- VCC Isolation Feature: Ensures both ports are in the high-impedance state if either VCC input is at GND.
- 3-State Outputs: Output-mode enables (OE) allow for high-impedance state control.
Applications
The SN74AVC4T245PWTG4 is ideal for level-translation applications where devices or systems operate at different interface voltages. It is particularly useful in scenarios where a push-pull driver is connected to the data I/Os. Common applications include:
- Interfacing devices or systems operating at different voltage levels.
- High-speed data translation in various electronic systems.
- Partial-power-down mode applications to conserve power.
Q & A
- What is the power supply voltage range for the SN74AVC4T245PWTG4?
The power supply voltage range for both A and B ports is from 1.2V to 3.6V.
- What is the maximum operating temperature for this device?
The operating temperature range is from -40°C to 85°C).
- Can the SN74AVC4T245PWTG4 support high-speed data translation?
Yes, it supports high data rate applications, with translated signal data rates up to 380Mbps when translating from 1.8V to 3.3V).
- How does the device handle partial-power-down mode?
The Ioff circuitry prevents backflow current through the I/O output circuits when the device is powered down).
- What is the purpose of the VCC isolation feature?
The VCC isolation feature ensures that if either VCC input is at GND, then both ports are in the high-impedance state).
- How do you ensure the high-impedance state during power up or power down?
To ensure the high-impedance state, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver).
- What are the common applications for the SN74AVC4T245PWTG4?
Common applications include interfacing devices or systems operating at different voltage levels, high-speed data translation, and partial-power-down mode applications).
- What is the significance of the 3-state outputs in this device?
The 3-state outputs allow for high-impedance state control using the output-mode enables (OE)).
- What are the available package types for the SN74AVC4T245PWTG4?
The device is available in SOIC, TVSOP, TSSOP, VQFN, and UQFN packages).
- Is the SN74AVC4T245PWTG4 compliant with RoHS regulations?
Yes, the device is compliant with RoHS regulations (2011/65/EU, 2015/863)).
