Texas Instruments PCF8574A
The PCF8574A device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)]. The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with highcurrent drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal.| Part No. | PCF8574A |
|---|---|
| Datasheet | PCF8574A Download |
| Manufacturer |  Texas Instruments |
| Description | Remote 8-Bit I/O Expander |
| Buy | Stock & Price |
FEATURES
● Low Standby-Current Consumption of 10 μA Max● I2C to Parallel-Port Expander
● Open-Drain Interrupt Output
● Compatible With Most Microcontrollers
● Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
● Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II 2
APPLICATIONS
● Telecom Shelters: Filter Units● Servers
● Routers (Telecom Switching Equipment)
● Personal Computers
● Personal Electronics
● Industrial Automation
● Products with GPIO-Limited Processors 1 3
DESCRIPTION
This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 6-V VCC operation. At power on, the I/Os are high. In this mode, only a current source to VCC is active. Device Information(1) PART NUMBER PACKAGE (PIN) BODY SIZE (NOM) VQFN (20) 4.50 mm × 3.50 mm PDIP (16) 19.30 mm × 6.35 mm PCF8574A SOIC (16) 10.30 mm × 7.50 mm TSSOP (20) 6.50 mm × 4.40 mm TVSOP (20) 5.00 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet.
