Overview
The SN74AVC4T774 is a 4-bit noninverting bus transceiver produced by Texas Instruments. This device is designed to operate with two separate configurable power-supply rails, allowing for universal low-voltage bi-directional translation between various voltage nodes (1.2V, 1.5V, 1.8V, 2.5V, and 3.3V). It is optimized for asynchronous communication between data buses and features independent direction-control inputs and output-enable inputs to manage data flow and output states.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCCA (A-port supply voltage) | 1.1 | - | 3.6 | V |
| VCCB (B-port supply voltage) | 1.1 | - | 3.6 | V |
| Operating free-air temperature (TA) | -40 | - | 85 | °C |
| Input voltage range (VI) | -0.5 | - | 4.6 | V |
| Low-level output current (IOL) at VCCA = 3V to 3.6V | - | - | 12 | mA |
| High-level output current (IOH) at VCCA = 3V to 3.6V | - | - | -12 | mA |
| Propagation delay time (tPLH, tPHL) A to B, B to A | 0.3 | - | 6.5 | ns |
| Package types | TSSOP (PW, 16), VQFN (RGY, 16), UQFN (RSV, 16), BQB (WQFN, 16), DYY (SOT, 16) | - | - | - |
Key Features
- Each channel has an independent DIR control input referenced to VCCA.
- Control inputs VIH/VIL levels are referenced to VCCA voltage.
- Operates with VCCA/VCCB set at 1.4V to 3.6V and is operational with VCCA/VCCB as low as 1.2V.
- Universal low-voltage bi-directional translation between various voltage nodes.
- Logic levels of the direction-control (DIR) input and the output-enable (OE) input manage data flow and output states.
- Input circuitry on both A and B ports is always active and requires a logic HIGH or LOW level to prevent excess current.
- Ioff circuitry disables the outputs to prevent damaging current backflow during power-down.
- VCC isolation feature ensures both ports are in the high-impedance state if either VCC input is at GND.
Applications
- Personal electronic devices.
- Industrial applications.
- Enterprise systems.
- Telecom equipment.
Q & A
- What is the SN74AVC4T774 used for?
The SN74AVC4T774 is used for universal low-voltage bi-directional translation between different voltage nodes in data buses. - What are the operating voltage ranges for VCCA and VCCB?
VCCA and VCCB operate within the range of 1.1V to 3.6V. - What is the significance of the DIR control inputs?
The DIR control inputs manage the direction of data flow between the A and B ports. - How does the output-enable (OE) input function?
The OE input activates or deactivates the outputs and can place both output ports in the high-impedance mode. - What is the purpose of the Ioff circuitry?
The Ioff circuitry disables the outputs to prevent damaging current backflow during power-down. - Why is it important to keep the input circuitry active?
Keeping the input circuitry active with a logic HIGH or LOW level prevents excess ICC and ICCZ current. - What are the package options available for the SN74AVC4T774?
The device is available in TSSOP (PW, 16), VQFN (RGY, 16), UQFN (RSV, 16), BQB (WQFN, 16), and DYY (SOT, 16) packages. - What is the operating temperature range for the SN74AVC4T774?
The operating temperature range is from -40°C to 85°C. - How does the VCC isolation feature work?
If either VCC input is at GND, the VCC isolation feature ensures both ports are in the high-impedance state. - What are some common applications of the SN74AVC4T774?
Common applications include personal electronic devices, industrial systems, enterprise systems, and telecom equipment.
