IO Expanders
  • SX1501
  • 4/8/16 Channel Low Voltage GPIO
  • SX1502
  • 4/8/16 Channel Low Voltage GPIO
  • SX1503
  • 4/8/16 Channel Low Voltage GPIO
  • SX1504
  • SX1504/SX1505/SX1506 4/8/16 Channel GPIO
  • SX1505
  • SX1504/SX1505/SX1506 4/8/16 Channel GPIO
  • SX1506
  • SX1504/SX1505/SX1506 4/8/16 Channel GPIO
  • SX1509B
  • World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine
Semtech SX1508B

Semtech SX1508B

World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine


The SX1508B and SX1509B are complete ultra low voltage General Purpose parallel Input/Output (GPIO) expanders ideal for low power handheld battery powered equipment. This family of GPIOs comes in 4-, 8-, 16-channel configuration and allows easy serial expansion of I/O through a standard 400kHz I²C interface.


  • 1.2V to 5.5V (SX1507B) Low Operating
  • Voltage with Dual Independent I/O Rails (VCC1, VCC2)
    • Enable Direct Level Shifting Between I/O
  • Banks and Host Controller
  • 5.5V Tolerant I/Os, Up to 15mA Output Sink on
  • All I/Os (No Total Sink Current Limit)
  • Integrated LED Driver for Enhanced Lighting
    • Intensity Control (256-step PWM)
    • Blink Control (224 On/Off values)
    • Breathing Control (224 Fade In/Out values)
  • On-Chip Keypad Scanning Engine
    • Support Up to 8x8 Matrix (64 Keys)
    • Configurable Input Debouncer
  • 4/8/16 Channels of True Bi-directional Style I/O
    • Programmable Pull-up/Pull-down
    • Push/Pull or Open-drain outputs
    • Programmable Polarity
  • Open Drain Active Low Interrupt Output (NINT)
    • Bit Maskable
    • Programmable Edge Sensitivity
  • Built-in Clock Management (Internal 2MHz Oscillator/External Clock Input, 7 clock values)
  • OSCIO can be Configured as GPO
  • 400kHz I2C Compatible Slave Interface
  • 4 User-Selectable I²C Slave Addresses
  • Power-On Reset and Reset Input (NRESET)
  • Ultra Low Current Consumption: 1uA Typ
  • -40°C to +85°C Operating Temperature Range
  • Up to 2kV HBM ESD Protection
  • Small Footprint Packages
  • Pb & Halogen Free, RoHS/WEEE compliant


  • Cell phones, PDAs, MP3 players
  • Digital camera, Notebooks, GPS Units
  • Any battery powered equipment


  • QFN-UT-20
  • QFN-UT-28

Order Codes

  • SX1508BEVK:  Evaluation Kit
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