This 16-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 4.5-V to 5.5-V VCC operation.
The PCF8575C provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface serial clock (SCL) and serial data (SDA).
The device features a 16-bit quasi-bidirectional input/output (I/O) port (P07–P00, P17–P10), including latched outputs with high-current 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. At power on, the I/Os are in 3-state mode. The strong pullup to VCC allows fast-rising edges into heavily loaded outputs. This device turns on when an output is written high and is switched off by the negative edge of SCL. The I/Os should be high before being used as inputs. After power on, as all the I/Os are set to 3-state, all of them can be used as inputs. Any change in setting of the I/Os as either inputs or outputs can be done with the write mode. If a high is applied externally to an I/O that has been written earlier to low, a large current (IOL) flows to GND.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | PCF8575C Remote 16-Bit I2C AND SMBus Low-Power I/O Expander with Interrupt Output datasheet (Rev. F) | PDF | HTML | 25 Jan 2015 |
| Application note | I2C Dynamic Addressing | 25 Apr 2019 | ||
| Application note | Choosing the Correct I2C Device for New Designs | PDF | HTML | 07 Sep 2016 | |
| Application note | Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) | 02 Dec 2015 | ||
| Application note | Understanding the I2C Bus | PDF | HTML | 30 Jun 2015 | |
| Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 15 May 2015 | ||
| Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 13 Feb 2015 | |
| Application note | Programming Fun Lights With TI's TCA6507 | 30 Nov 2007 | ||
| More literature | PCF8574 and PCF8574A Application Clip | 18 Aug 2004 | ||
| More literature | I2C Application Clip | 19 Jul 2004 | ||
| Application note | Semiconductor Packing Material Electrostatic Discharge (ESD) Protection | 08 Jul 2004 | ||
| More literature | I2C and Serial Bus Devices Application Clip | 10 Jul 2003 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | Download |
|---|---|---|
| SOIC (DW) | 24 | View options |
| SSOP (DB) | 24 | View options |
| SSOP (DBQ) | 24 | View options |
| TSSOP (PW) | 24 | View options |
| TVSOP (DGV) | 24 | View options |
| VQFN (RGE) | 24 | View options |
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