Overview
The SN74ABT126DB, produced by Texas Instruments, is a quadruple bus buffer gate with 3-state outputs. This component is designed to provide independent line drivers, each with its own output-enable (OE) input. When the OE input is low, the associated output is disabled and enters a high-impedance state. This feature is particularly useful in bus systems where multiple devices need to share the same bus lines without interfering with each other.
The device operates over a supply voltage range of 4.5 to 5.5 volts and is available in several package options, including the SSOP (DB) package. It is suitable for a wide range of applications requiring high-drive outputs and 3-state functionality.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Supply Voltage (VCC) | V | 4.5 | 5.5 | |
| High-Level Input Voltage (VIH) | V | 2 | ||
| Low-Level Input Voltage (VIL) | V | 0.8 | ||
| High-Level Output Current (IOH) | mA | -24 | -32 | |
| Low-Level Output Current (IOL) | mA | 48 | 64 | |
| Operating Free-Air Temperature (TA) | °C | -40 | 85 | |
| Package Thermal Impedance (θJA) | °C/W | 96 |
Key Features
- Independent line drivers with 3-state outputs.
- High-drive outputs: -32 mA IOH and 64 mA IOL.
- High-impedance state during power up and power down.
- Ioff and power-up 3-state support for hot insertion.
- Latch-up performance exceeds 500 mA per JESD 17.
- ESD protection exceeds JESD 22: 2000-V Human-Body Model and 200-V Machine Model.
Applications
The SN74ABT126DB is suitable for various applications requiring bus buffering and 3-state logic, such as:
- Computer systems and peripherals.
- Telecommunication equipment.
- Industrial control systems.
- Data acquisition and processing systems.
- Any application needing high-drive outputs and 3-state bus buffering.
Q & A
- What is the primary function of the SN74ABT126DB?
The primary function is to provide independent line drivers with 3-state outputs for bus buffering applications.
- What is the supply voltage range for the SN74ABT126DB?
The supply voltage range is from 4.5 to 5.5 volts.
- What are the high-level and low-level output currents for this device?
The high-level output current (IOH) is -24 to -32 mA, and the low-level output current (IOL) is 48 to 64 mA.
- How does the device handle power-up and power-down states?
The device enters a high-impedance state during power up and power down to prevent bus contention.
- What is the operating temperature range for the SN74ABT126DB?
The operating temperature range is from -40°C to 85°C.
- What kind of ESD protection does the SN74ABT126DB offer?
The device offers ESD protection exceeding JESD 22: 2000-V Human-Body Model and 200-V Machine Model.
- What package options are available for the SN74ABT126?
Available packages include SSOP (DB), SOIC (D), PDIP (N), SOP (NS), TSSOP (PW), and VQFN (RGY).
- How do you ensure the high-impedance state above 2.1 V during power up or power down?
To ensure the high-impedance state, the OE input should be tied to GND through a pulldown resistor.
- What is the significance of Ioff and power-up 3-state support?
This feature supports hot insertion, allowing the device to be safely inserted or removed from a live system without causing damage.
- What are some common applications for the SN74ABT126DB?
Common applications include computer systems, telecommunication equipment, industrial control systems, and data acquisition systems.
