Overview
The AM26LS31CDBR, produced by Texas Instruments, is a quadruple differential line driver designed for unidirectional data communication on transmission lines. This device meets or exceeds the requirements of ANSI TIA/EIA-422-B and ITU Recommendation V.11, making it suitable for a variety of applications requiring reliable and high-speed data transmission.
The AM26LS31CDBR operates from a single 5V power supply and features TTL-compatible inputs. It includes low-power Schottky circuitry to reduce power consumption without compromising speed. The device has four 3-state differential line drivers, each capable of handling loads with a minimum of ±30mA of sink or source current, and includes positive- and negative-current limiting for protection against line fault conditions.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 4.75 | 5.25 | V | ||
| Propagation Delay Time (tPLH) | CL = 30pF, S1 and S2 open | 14 | 20 | ns | |
| Propagation Delay Time (tPHL) | CL = 30pF, S1 and S2 open | 14 | 20 | ns | |
| Output Enable Time to High Level (tPZH) | CL = 30pF, RL = 75Ω | 25 | 40 | ns | |
| Output Disable Time from High Level (tPHZ) | CL = 10pF, S1 and S2 closed | 21 | 30 | ns | |
| Supply Current (ICC) | VCC = MAX, all outputs disabled | 32 | 80 | mA | |
| Short-Circuit Output Current (IOS) | VCC = MAX | -30 | -150 | mA | |
| Package Type | SSOP (16) | ||||
| Package Size | 6.2mm × 5.3mm |
Key Features
- Meets or exceeds the requirements of ANSI TIA/EIA-422-B and ITU Recommendation V.11.
- Operates from a single 5V power supply.
- TTL-compatible inputs.
- Complementary outputs.
- High output impedance in power-off conditions.
- Complementary output-enable inputs (active-high or active-low enable).
- Low-power Schottky circuitry for reduced power consumption without sacrificing speed.
- Positive- and negative-current limiting for protection from line fault conditions.
- Available MIL-PRF-38535-qualified options.
Applications
- Motor encoders.
- Field transmitters: pressure sensors and temperature sensors.
- Military and avionics imaging.
- Temperature sensors or controllers using Modbus.
Q & A
- What are the primary standards that the AM26LS31CDBR complies with?
The AM26LS31CDBR meets or exceeds the requirements of ANSI TIA/EIA-422-B and ITU Recommendation V.11.
- What is the operating voltage range of the AM26LS31CDBR?
The device operates from a single 5V power supply, with a range of 4.75V to 5.25V for C-suffix devices and 4.5V to 5.5V for M-suffix devices.
- What type of inputs does the AM26LS31CDBR have?
The device has TTL-compatible inputs.
- How many differential line drivers does the AM26LS31CDBR have?
The device has four 3-state differential line drivers.
- What is the significance of the complementary output-enable inputs?
The complementary output-enable inputs allow for precise control of the transmitter outputs using either active-high or active-low enable logic.
- What is the maximum short-circuit output current of the AM26LS31CDBR?
The maximum short-circuit output current is -150 mA.
- What is the typical propagation delay time for the AM26LS31CDBR?
The typical propagation delay time (tPLH and tPHL) is 20 ns.
- What are some common applications of the AM26LS31CDBR?
Common applications include motor encoders, field transmitters, military and avionics imaging, and temperature sensors or controllers using Modbus.
- What package types are available for the AM26LS31CDBR?
The device is available in several package types, including SSOP (16-pin).
- Does the AM26LS31CDBR have any special protection features?
Yes, it features positive- and negative-current limiting for protection from line fault conditions.
