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TXE8124

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24-bit SPI bus I/O expander with interrupt, reset, and I/O configurable registers

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Data sheet

TXE8124

ACTIVE
Data sheet Order now

Product details

Number of I/Os 24 Features Configuration registers, Fail-safe, Interrupt pin, Reset pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 5.5 Rating Catalog Frequency (max) (MHz) 10 Operating temperature range (°C) -40 to 125
Number of I/Os 24 Features Configuration registers, Fail-safe, Interrupt pin, Reset pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 5.5 Rating Catalog Frequency (max) (MHz) 10 Operating temperature range (°C) -40 to 125
VQFN (RHB) 32 25 mm² 5 x 5 VSSOP (DGS) 32 39.69 mm² 8.1 x 4.9
  • Operating supply voltage range of 1.65V to 5.5V
  • Low standby current consumption of 2.3µA typical
  • SPI SCLK Frequency
    • 10MHz from 3.3V to 5.5V
    • 5MHz from 1.65V to 5.5V
  • SPI daisy-chain supported
  • SPI read and write with burst mode
  • Multi-port SPI command to configure multiple ports simultaneously
  • IOFF supported input port pins
  • Active-low reset input (RESET)
  • Open-drain active-low interrupt output (INT)
    • Interrupt mask and status per I/O
    • Interrupt status per port
  • Built-in fail-safe I/O feature
  • Individual I/O configuration for
    • Input and Output function
    • Polarity inversion
    • Output push-pull and open-drain selection
    • Integrated pull-up or pull-down selection
    • Bus-hold feature to maintain last I/O state
    • Glitch filter enable selection
  • Latched outputs with 10mA drive capability for directly driving LEDs
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 2000V Human-body model (A114-A)
    • 1000V Charged-device model (C101)
  • Operating supply voltage range of 1.65V to 5.5V
  • Low standby current consumption of 2.3µA typical
  • SPI SCLK Frequency
    • 10MHz from 3.3V to 5.5V
    • 5MHz from 1.65V to 5.5V
  • SPI daisy-chain supported
  • SPI read and write with burst mode
  • Multi-port SPI command to configure multiple ports simultaneously
  • IOFF supported input port pins
  • Active-low reset input (RESET)
  • Open-drain active-low interrupt output (INT)
    • Interrupt mask and status per I/O
    • Interrupt status per port
  • Built-in fail-safe I/O feature
  • Individual I/O configuration for
    • Input and Output function
    • Polarity inversion
    • Output push-pull and open-drain selection
    • Integrated pull-up or pull-down selection
    • Bus-hold feature to maintain last I/O state
    • Glitch filter enable selection
  • Latched outputs with 10mA drive capability for directly driving LEDs
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 2000V Human-body model (A114-A)
    • 1000V Charged-device model (C101)

The TXE8124 devices provide general purpose parallel input/output (I/O) expansion for the four wire Serial Peripheral Interface (SPI) protocol and is designed for 1.65V to 5.5V VCC operation. The TXE8124 supports both standard point-to-point communication along with daisy-chaining of multiple devices.

The device supports 10MHz from 3.3V to 5.5V and 5MHz from 1.65V to 5.5V. I/O expanders, such as the TXE8124, are designed for when additional I/Os are needed for switches, sensors, push-buttons, LEDs, and fans.

The TXE8124 devices has 3 I/O ports of 8 IOs each, which include additional features designed to enhance the I/O performance in terms of speed, power consumption, and flexibility. These include per I/O programmable open-drain or push-pull outputs, programmable pull-up and pull-down resistors, bus-hold latchable inputs, maskable interrupt, interrupt status register, glitch filter and a fail-safe register mode which is enabled by the FAIL-SAFE pin.

The TXE8124 devices provide general purpose parallel input/output (I/O) expansion for the four wire Serial Peripheral Interface (SPI) protocol and is designed for 1.65V to 5.5V VCC operation. The TXE8124 supports both standard point-to-point communication along with daisy-chaining of multiple devices.

The device supports 10MHz from 3.3V to 5.5V and 5MHz from 1.65V to 5.5V. I/O expanders, such as the TXE8124, are designed for when additional I/Os are needed for switches, sensors, push-buttons, LEDs, and fans.

The TXE8124 devices has 3 I/O ports of 8 IOs each, which include additional features designed to enhance the I/O performance in terms of speed, power consumption, and flexibility. These include per I/O programmable open-drain or push-pull outputs, programmable pull-up and pull-down resistors, bus-hold latchable inputs, maskable interrupt, interrupt status register, glitch filter and a fail-safe register mode which is enabled by the FAIL-SAFE pin.
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* Data sheet TXE8124 24-Bit SPI Bus I/O Expander with Interrupt Output, Reset Input, and I/O Configuration Registers datasheet PDF | HTML 30 Mar 2026
Functional safety information TXE8124 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 15 Apr 2026
Application note Discrete Active Cell Balancing Design PDF | HTML 29 Oct 2025
Application brief Understanding the SPI Bus PDF | HTML 22 Aug 2025
Application note How to Program TXE81XX SPI I/O Expander Family PDF | HTML 24 Jul 2025

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