XL8574TS

This device (XL8574 or XL8574A) provides general-purpose remote 1/0 expansion via the two-wire bidirectional 1²C -bus interface [serial clock line (SCL), serial data line (SDA)]. The devices consist of eight quasi-bidirectional ports, 100kHz 1²C -bus interface, three hardware address inputs and interrupt output operating between 2.5V and 6.0V. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs. System master can read from the input port or write to the output port through a single register. The low current consumption of 2.5μA (typical, static) is great for mobile applications and the latched output ports directly drive LEDs. The XL8574 and XL8574A are identical, except for the different fixed portion of the slave address. The 3 hardware address pins (A0, A1 and A2) allow eight of each device to be on the same 1²C -bus, so there can be up to 16 of these I/O expanders XL8574/8574A together on the same |²C -bus, supporting up to 128 |/0s (for example, 128 LEDs). The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic of the MCU and is activated when any input state differs from its corresponding input port register state. It is used to indicate to the MCU that an input state has changed and the device needs to be interrogated without the MCU continuously polling the input register via the 1²C -bus. The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internal pull-up 100μA current source, the I/Os are HIGH logic levels.

Applications

• LED signs and displays
• Servers
• Key pads
• Industrial control
• Medical equipment
• PLC
• Cellular telephones
• Personal electronics
• Mobile devices
• Gaming machines
• Instrumentation and test measurement
• Products with GPIO-Limited processors

Key features

• I²C -bus to parallel port expander
• 100kHz I²C -bus clock frequency (Standard-mode I2C-bus)
• Operating power supply voltage 2.5V to 6.0V with non-overvoltage tolerant I/O held to VCC with 100μA current source
• Low standby current 2.5μA (typical)
• 8-bit remote 1/0 pins that default to inputs at power-up
• Latched outputs directly drive LEDs
• Total package sink capability of 80mA
• Open-drain active LOW interrupt output
• Address by 3 hardware address pins for use of up to 8 devices
• -40°C to +85°C operation
• Packages offered: DIP16, SO16W, SSOP20
• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100mA
• ESD protection exceeds JESD 22 2000V HBM, 200V MM and 1000V CDM