1 Features

• 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

• Active-low reset input (RESET)

• 5V tolerant input and output ports

• Buit-in fail-safe I/O feature

• Open-drain active-low interrupt output (INT)

• Individual I/O control and the glitch filter supported

on all inputs of the GPIOs

• SPI daisy-chain supported

• I/O reading burst mode supported

• I/O polarity inversion supported

• Bus-hold feature to maintain the last I/O state

• Latched outputs with high-current 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)

2 Applications

• Industrial transportation

• Industrial automation

• Testing and measurement

• Factory automation & control

• Medical and healthcare

• Servers

• Routers (telecom switching equipment)

• Products with GPIO-limited processors

3 Description

The TXE81XX 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 device supports 10MHz from 3.3V to 5.5V and

5MHz from 1.65V to 5.5V. I/O expanders, such as the

TXE81XX, provide a simple solution when additional

I/Os are needed for switches, sensors, push-buttons,

LEDs, and fans.

The TXE81XX devices have I/O ports, which include

additional features designed to enhance the I/O

performance in terms of speed, power consumption,

and flexibility. The additional features are: enable/

disable pull-up and pull-down resistors, latchable

inputs, maskable interrupt, interrupt status register,

programmable open-drain or push-pull outputs, and a

fail-safe register mode which is enabled by the FAILSAFE

pin.