SX1508IULTRT

Overview

The SX1508IULTRT is an ultra-low voltage General Purpose Input/Output (GPIO) expander featuring an integrated LED driver and keypad engine. It provides 8 bidirectional I/O channels via a standard 400kHz I2C interface, supporting Fast-mode operation. The device operates with a core supply voltage of 1.425V to 3.6V and dual independent I/O banks ranging from 1.2V to 3.6V. Key electrical parameters include up to 15mA output sink current per pin and 5.5V tolerant inputs. It includes programmable pull-up/pull-down resistors, open-drain or push-pull outputs, and mask-programmable interrupts.

Feature Summary

• Integrated LED Driver for enhanced lighting control including intensity, blinking, and breathing modes
• On-chip Keypad Scanning Engine supporting matrix configurations up to 8x8 keys
• Dual independent I/O rails enabling direct level shifting between host and peripheral components
• Programmable interrupt generation based on rising or falling edges with bit-maskable functionality

Applications

• Cell phones and PDAs
• MP3 players and digital cameras
• Notebooks and GPS units
• Battery-powered handheld equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and reel specifications. Ensure compatibility with the target system's I2C bus voltage levels and timing requirements before finalizing procurement. Cross-reference the part number with official distributor catalogs to confirm availability and lead times.

Selection Notes

Select this component when expanding I/O capabilities in low-voltage systems requiring simultaneous LED control and keypad scanning. The SX1508IULTRT is suitable for designs needing level shifting between different voltage domains without external translators. Consider the QFN-UT-20 package constraints and thermal dissipation requirements during PCB layout planning.

Part Context

This device belongs to the SX1507/SX1508/SX1509 family of world’s lowest voltage level-shifting GPIOs. While the SX1507 offers 4 channels and the SX1509 provides 16 channels, the SX1508 specifically delivers 8 channels with full keypad engine support. All variants share identical core features, power management characteristics, and interface protocols.

Replacement Considerations

Direct substitutes within the same series include the SX1507XXX and SX1509XXX. Verify channel count requirements and package footprint compatibility when considering these alternatives. Ensure that any replacement maintains the required I2C address configuration and voltage tolerance specifications.