2SK2315TYTR-E

Overview

The ISL3331 is a BiCMOS interface IC from Renesas Electronics Corporation that functions as a dual protocol transceiver. It is user-configurable as either a single RS-422/RS-485 differential transceiver or a dual (2 Tx, 2 Rx) RS-232 transceiver. In RS-232 mode, an on-board charge pump generates compliant ±5V Tx output levels from a supply as low as 3.15V, requiring four small 0.1µF capacitors. The device operates from a single 3.3V supply and features ±15kV (HBM) ESD protection on bus pins. It supports user-selectable RS-485 data rates up to 20Mbps, with slew rate limited options at 460kbps and 115kbps, and fast RS-232 rates up to 400kbps. A low current shutdown mode draws 30µA, and a logic supply pin (VL) facilitates operation in mixed supply systems.

Feature Summary

• User-selectable interface port configuration for RS-232 or RS-485/RS-422 communication standards
• Integrated charge pump generating RS-232 compliant voltage levels from a single low-voltage supply
• Full failsafe receiver operation ensuring high state output during open or shorted input conditions
• Internal loopback mode connecting Tx outputs to Rx inputs for board-level self-test functionality

Applications

• Industrial control systems requiring flexible serial communication interfaces
• Embedded devices needing board-level self-test capabilities via loopback mode
• Mixed supply systems utilizing the dedicated logic supply pin for level compatibility

Procurement Notes

Verify the specific package type and temperature grade against your design requirements before ordering. Confirm that the component status remains active or check for end-of-life notifications if long-term availability is critical. Ensure that the selected variant meets all regulatory compliance standards required for your target market.

Selection Notes

Choose this transceiver when a single component must support both RS-232 and RS-485/RS-422 protocols to reduce bill of materials. Select this part if space constraints favor the QFN package over larger alternatives. Consider the low shutdown current for battery-operated applications requiring extended standby periods.

Part Context

This device belongs to the family of BiCMOS interface ICs designed for robust serial communication. It integrates advanced features like ESD protection and failsafe receivers to enhance reliability in noisy industrial environments. The dual protocol capability allows designers to reuse hardware designs across different communication standard requirements.

FAQ

How does the device handle power consumption in RS-485 mode?

In RS-485 mode, the internal charge pump is disabled. This action saves power, minimizes electrical noise, and eliminates the need for external charge pump capacitors.

What is the function of the loopback mode?

Loopback mode internally connects the transmitter outputs to the corresponding receiver inputs. This feature facilitates the implementation of board-level self-test functions without external wiring.