ISL8491IBZ-T Product Information

Overview

The ISL8491 is a 5V, low power, high-speed, full-duplex RS-485/RS-422 transceiver designed for reliable communication in industrial and network applications. The ISL8491IBZ-T is a specific variant of this transceiver, packaged in an 8-lead SOIC (Small Outline Integrated Circuit) and suitable for a wide range of operating temperatures.

Key Features

• 5V Operation: Compatible with a single +5V supply (10% tolerance).
• High Data Rates: Supports data rates up to 5 Mbps.
• Full Duplex Communication: Separate receiver and transmitter pins for simultaneous data transmission and reception.
• Receiver Fail-Safe: Ensures a logic high output if the receiver inputs are open.
• Driver Protection: Short-circuit protection and thermal shutdown to prevent damage.
• RoHS Compliant: Pb-free plus anneal, suitable for both SnPb and Pb-free soldering operations.

Applications

• Factory Automation: For control and monitoring systems.
• Security Networks: For reliable data transmission in security systems.
• Building Environmental Control Systems: For managing HVAC and other environmental systems.
• Industrial/Process Control Networks: For robust communication in industrial settings.
• Level Translators: For converting between different communication standards (e.g., RS-232 to RS-422).

Electrical Specifications

DC Characteristics

• Driver Differential Output Voltage (VOD): 2V typical with a 54Ω load.
• Driver Common-Mode Output Voltage (VOC): Up to 3V.
• Logic Input High Voltage (VIH): Minimum 2V.
• Logic Input Low Voltage (VIL): Maximum 0.8V.
• Receiver Differential Threshold Voltage (VTH): ±0.2V.
• Receiver Output High Voltage (VOH): Minimum 3.5V.
• Receiver Output Low Voltage (VOL): Maximum 0.4V.

Switching Characteristics

• Driver Input to Output Delay (tPLH, tPHL): 30ns typical.
• Driver Output Skew (tSKEW): Maximum 10ns.
• Driver Differential Rise/Fall Time (tR, tF): 11ns typical.
• Receiver Input to Output Delay (tPLH, tPHL): 40ns typical.
• Receiver Skew (tSKD): Maximum 5ns.

Ordering Information

• Part Number: ISL8491IBZ-T
• Package: 8-lead SOIC (Small Outline Integrated Circuit)
• Temperature Range: -40°C to +85°C
• Carrier Type: Tube

Pin Descriptions

• RO: Receiver output.
• RE: Receiver output enable.
• DE: Driver output enable.
• DI: Driver input.
• GND: Ground connection.
• A: Noninverting receiver input.
• B: Inverting receiver input.
• Y: Noninverting driver output.
• Z: Inverting driver output.
• Vcc: System power supply input (4.5V to 5.5V).

Truth Tables

Transmitting

TableCopy

Receiving

TableCopy

Absolute Maximum Ratings

• VCC to Ground: 7V
• Input Voltages (DI, DE, RE): -0.5V to (VCC + 0.5V)
• Input/Output Voltages (A, B, Y, Z): -8V to +12.5V
• Short Circuit Duration: Continuous
• ESD Rating (HBM): >7kV

Operating Conditions

• Temperature Range: -40°C to +85°C

Thermal Information

• Thermal Resistance (JA): 170°C/W for 8-lead SOIC package
• Maximum Junction Temperature: +150°C
• Storage Temperature Range: -65°C to +150°C

Additional Information

• Process: Si Gate CMOS
• Transistor Count: 518
• Substrate Potential: GND when powered up