MAX7317

MAX7317 10-Port SPI-Interfaced I/O Expander with Overvoltage and Hot-Insertion Protection General Description The MAX7317 serial-interfaced peripheral provides microprocessors with 10 I/O ports rated to 7V. Each port can be individually configured as either an open-drain output, or an overvoltage-protected Schmitt input. The MAX7317 supports hot insertion. All port pins remain high impedance in power-down (V+ = 0V) with up to 8V asserted on them. The MAX7317 is available in 16-pin TQFN and QSOP packages and operates in the -40°C to +125°C range. For a similar part with constant-current outputs and 8-bit PWM controls, refer to the MAX6966/MAX6967 data sheet. Applications ●● Portable Equipment ●● Cellular Phones ●● White Goods ●● Industrial Controllers ●● System Monitoring QSPI is a trademark of Motorola, Inc. MICROWIRE is a registered trademark of National Semiconductor Corp. Typical Application Circuit µC SCLK MOSI MISO CS +3.3V MAX7317 SCLK DIN DOUT CS GND P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 I/O PORTS Benefits and Features ●● Industry-Standard 4-Wire Interface Simplifies I/O Ports Expansion Independent of Microprocessor Architecture High-Speed, 26MHz, SPI-/QSPI™-/MICROWIRE®Compatible Serial Interface 2.25V to 3.6V Operation ●● Protection Circuitry Ensures Robust Operation I/O Port Inputs Are Overvoltage Protected to 7V I/O Port Outputs Are 7V-Rated Open Drain I/O Ports Support Hot Insertion ●● Low Power Consumption and Small Package Reduce Board Size and ...