Overview
The SN74LVTH244APW is an octal buffer and line driver produced by Texas Instruments. This device is designed for low-voltage (3.3-V) VCC operation but also supports a TTL interface in a 5-V system environment. It is organized as two 4-bit line drivers with separate output-enable (OE) inputs, allowing for flexible control over data transmission. The SN74LVTH244APW features active bus-hold circuitry, Ioff and power-up 3-state support, making it suitable for hot-insertion applications and preventing damaging current backflow during power cycles.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TSSOP (PW) | - |
| Pins | 20 | - |
| Operating Temperature Range | -40 to 85 | °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 |
| High-Level Output Current (IOH) | -32 | mA |
| Low-Level Output Current (IOL) | 64 | mA |
| Propagation Delay Time (tPLH, tPHL) | 1.1 to 4.1 | ns |
Key Features
- Support for 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
- Support for 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
- Latch-up performance exceeds 500 mA per JESD 17
- ESD protection exceeds JESD 22 (2000-V human-body model, 200-V machine model)
Applications
The SN74LVTH244APW is suitable for a variety of applications, including:
- Low-voltage logic systems requiring TTL compatibility
- Hot-insertion applications where power-up and power-down states need to be managed
- Systems needing active bus-hold circuitry to maintain valid logic levels on unused or floating inputs
- Applications requiring robust ESD protection and latch-up performance
Q & A
- What is the operating temperature range of the SN74LVTH244APW?
The operating temperature range is -40°C to 85°C.
- What is the supply voltage range for the SN74LVTH244APW?
The supply voltage range is 2.7 V to 3.6 V.
- Does the SN74LVTH244APW support hot-insertion applications?
- What type of package does the SN74LVTH244APW come in?
The device comes in a 20-pin TSSOP (PW) package.
- What is the purpose of the bus-hold circuitry in the SN74LVTH244APW?
The bus-hold circuitry holds unused or floating data inputs at a valid logic level, eliminating the need for external pullup/pulldown resistors.
- What level of ESD protection does the SN74LVTH244APW offer?
The device offers ESD protection exceeding JESD 22 standards, including 2000-V human-body model and 200-V machine model.
- How do you ensure the high-impedance state during power up or power down?
The output-enable (OE) input should be tied to VCC through a pullup resistor to ensure the high-impedance state during power up or power down.
- What is the typical propagation delay time for the SN74LVTH244APW?
The typical propagation delay time ranges from 1.1 to 4.1 ns.
- Can the SN74LVTH244APW operate with unregulated battery power?
- What is the maximum low-level output current for the SN74LVTH244APW?
The maximum low-level output current is 64 mA.
