Overview
The SN74LVTH245APWRG4 is an octal bus transceiver with tri-state outputs, designed and manufactured by Texas Instruments. This component is part of the LVTH series, which is optimized for low-voltage (3.3-V) operation but also compatible with 5-V system environments. It is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package) and is suitable for asynchronous communication between data buses.
The device allows data transmission from the A bus to the B bus or vice versa, controlled by the direction-control (DIR) input. The output-enable (OE) input can isolate the buses by placing the outputs in a high-impedance state. This feature is particularly useful in applications requiring bus isolation and hot-insertion capabilities.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | TSSOP (PW) | - |
| Pins | 20 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage Range (VCC) | 2.7 to 3.6 | V |
| High-Level Input Voltage (VIH) | 2 | V |
| Low-Level Input Voltage (VIL) | 0.8 | V |
| Propagation Delay Time (tPLH/tPHL) | 0.7 to 4.2 | ns |
| High-Level Output Current (IOH) | -24 to -32 | mA |
| Low-Level Output Current (IOL) | 48 to 64 | mA |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model | - |
Key Features
- 2-V to 5.5-V VCC operation, optimized for 3.3-V low-voltage operation
- Maximum propagation delay time of 6.5 ns at 5 V
- Support for mixed-mode voltage operation on all ports
- Ioff supports partial-power-down mode operation
- Latch-up performance exceeds 250 mA per JESD 17
- Active bus-hold circuitry to hold unused or floating data inputs at a valid logic level
- Power-up 3-state circuitry to prevent driver conflict during power up and power down
- ESD protection exceeding JESD 22 standards
Applications
The SN74LVTH245APWRG4 is designed for various applications requiring asynchronous communication between data buses, including:
- Hot-insertion applications where devices need to be powered up or down without causing bus conflicts
- Mixed-voltage systems where compatibility with both 3.3-V and 5-V logic levels is necessary
- Embedded systems, industrial control systems, and other applications requiring reliable and fast data transmission
- Systems that benefit from active bus-hold circuitry to maintain valid logic levels on unused or floating inputs
Q & A
- What is the operating temperature range of the SN74LVTH245APWRG4?
The operating temperature range is -40°C to 125°C.
- What is the supply voltage range for this device?
The supply voltage range is 2.7 V to 3.6 V.
- What is the maximum propagation delay time at 5 V?
The maximum propagation delay time at 5 V is 6.5 ns.
- Does the SN74LVTH245APWRG4 support mixed-mode voltage operation?
Yes, it supports mixed-mode voltage operation on all ports.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can be used to disable the device, placing the outputs in a high-impedance state and effectively isolating the buses.
- Does the device have ESD protection?
Yes, it has ESD protection exceeding JESD 22 standards, including 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What is the function of the active bus-hold circuitry?
The active bus-hold circuitry holds unused or floating data inputs at a valid logic level.
- Is the device suitable for hot-insertion applications?
Yes, it is fully specified for hot-insertion applications using Ioff and power-up 3-state circuitry.
- What package type is the SN74LVTH245APWRG4 available in?
The device is available in a 20-pin TSSOP (Thin Shrink Small Outline Package).
- What are some typical applications for this device?
Typical applications include hot-insertion systems, mixed-voltage systems, embedded systems, and industrial control systems.
