Overview
The SN74AXC4T245PWR, produced by Texas Instruments, is a four-bit noninverting bus transceiver designed for asynchronous communication between data buses. This device features a fully configurable dual-rail design, allowing each port to operate with a power supply range from 0.65V to 3.6V. It is compatible with both dual-supply and single-supply systems, making it versatile for various applications. The SN74AXC4T245PWR supports glitch-free power supply sequencing and includes VCC isolation features to ensure robust operation during power-up and power-down cycles.
Key Specifications
| Parameter | Minimum | Maximum | Unit |
|---|---|---|---|
| VCCA Supply Voltage | 0.65 | 3.6 | V |
| VCCB Supply Voltage | 0.65 | 3.6 | V |
| Operating Temperature | –40 | 125 | °C |
| Propagation Delay (A to B) | 0.5 | 128 | ns |
| Propagation Delay (B to A) | 0.5 | 108 | ns |
| Disable Time (OE) | 0.5 | 143 | ns |
| ESD Protection (Human-Body Model) | ±8000 | V | |
| ESD Protection (Charged-Device Model) | ±1000 | V | |
| Junction-to-Ambient Thermal Resistance (PW Package) | 126.9 | °C/W |
Key Features
- Fully configurable dual-rail design allowing each port to operate with a power supply range from 0.65V to 3.6V.
- Glitch-free power supply sequencing, enabling either supply rail to be powered on or off in any order.
- VCC isolation feature: if either VCC input is below 100mV, all I/O outputs are disabled and become high-impedance.
- Support for partial-power-down mode operation with Ioff current protection.
- ESD protection exceeding 8000V Human-Body Model and 1000V Charged-Device Model.
- Multiple direction control pins for simultaneous up and down translation.
- Tri-state output-mode enable inputs (OE) to disable outputs and isolate buses.
- Compatibility with AVC family level shifters and latch-up performance exceeding 100mA per JESD 78, Class II.
Applications
- Enterprise and communications systems.
- Industrial automation and control systems.
- Personal electronics and consumer devices.
- Wireless infrastructure and networking equipment.
- Building automation and control systems.
- Point of sale (POS) systems.
- Telematics control units in automotive applications (for the Q1 version).
Q & A
- What is the operating voltage range for the SN74AXC4T245PWR?
The device operates with supply voltages ranging from 0.65V to 3.6V for both VCCA and VCCB.
- What is the propagation delay for the SN74AXC4T245PWR?
The propagation delay from A to B and B to A varies depending on the supply voltage, ranging from 0.5ns to 128ns and 0.5ns to 108ns respectively.
- Does the SN74AXC4T245PWR support partial-power-down mode?
- What is the ESD protection level for the SN74AXC4T245PWR?
The device has ESD protection exceeding 8000V Human-Body Model and 1000V Charged-Device Model.
- How does the VCC isolation feature work?
If either VCC input is below 100mV, all I/O outputs are disabled and become high-impedance.
- What are the typical applications for the SN74AXC4T245PWR?
It is used in enterprise and communications, industrial, personal electronics, wireless infrastructure, building automation, and point of sale systems.
- What is the thermal resistance of the PW package?
The junction-to-ambient thermal resistance for the PW package is 126.9°C/W.
- Can the SN74AXC4T245PWR be used in automotive applications?
- How does the glitch-free power supply sequencing work?
The device allows either supply rail to be powered on or off in any order without causing glitches.
- What is the purpose of the direction control pins?
The direction control pins allow for simultaneous up and down translation between the A and B ports.
