Overview
The SN74LVTH245APW is an octal bus transceiver designed by Texas Instruments, specifically for low-voltage (3.3-V) operation with the capability to interface with 5-V system environments. These devices are optimized for asynchronous communication between data buses, allowing data transmission from the A bus to the B bus or vice versa based on the direction-control input. They feature output-enable inputs to isolate the buses when necessary and are fully specified for hot-insertion applications using Ioff and power-up 3-state circuitry.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TSSOP (PW) with 20 pins |
| Operating Temperature Range | -40°C to 85°C |
| VCC Operating Voltage | 2.7 V to 3.6 V |
| Input Voltage Range | Up to 5.5 V |
| Maximum Propagation Delay (tpd) at 3.3 V | 6.3 ns |
| Typical VOLP (Output Ground Bounce) | < 0.8 V at VCC = 3.3 V, TA = 25°C |
| ESD Protection | 2000-V Human-Body Model (A114-A), 200-V Machine Model (A115-A) |
| Latch-Up Performance | Exceeds 500 mA per JESD 17 |
Key Features
- Supports mixed-mode signal operation (5-V input and output voltages with 3.3-V VCC)
- Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25°C
- Supports unregulated battery operation down to 2.7 V
- Ioff and power-up 3-state support for hot insertion
- Bus hold on data inputs eliminates the need for external pullup/pulldown resistors
- ESD protection exceeds JESD 22 – 2000-V Human-Body Model (A114-A), 200-V Machine Model (A115-A)
Applications
The SN74LVTH245APW is suitable for various applications requiring asynchronous communication between data buses, such as in embedded systems, industrial control systems, and any environment where data needs to be transmitted between different voltage level systems. It is particularly useful in scenarios where hot insertion and power-up 3-state capabilities are necessary to prevent driver conflict and ensure reliable operation.
Q & A
- What is the primary function of the SN74LVTH245APW? The primary function is to act as an octal bus transceiver for asynchronous communication between data buses.
- What is the operating voltage range for the SN74LVTH245APW? The operating voltage range is from 2.7 V to 3.6 V.
- Can the SN74LVTH245APW handle 5-V input and output voltages? Yes, it supports mixed-mode signal operation with 5-V input and output voltages while operating at 3.3-V VCC.
- What is the maximum propagation delay at 3.3 V? The maximum propagation delay at 3.3 V is 6.3 ns.
- Does the SN74LVTH245APW have ESD protection? Yes, it exceeds JESD 22 – 2000-V Human-Body Model (A114-A), 200-V Machine Model (A115-A).
- What is the purpose of the bus hold feature? The bus hold feature eliminates the need for external pullup/pulldown resistors by holding unused or floating data inputs at a valid logic level.
- Is the SN74LVTH245APW suitable for hot-insertion applications? Yes, it is fully specified for hot-insertion applications using Ioff and power-up 3-state circuitry.
- How does the power-up 3-state circuitry work? The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, preventing driver conflict.
- What package type and pin count does the SN74LVTH245APW come in? It comes in a TSSOP (PW) package with 20 pins.
- What is the operating temperature range for the SN74LVTH245APW? The operating temperature range is from -40°C to 85°C.
