Product details

Number of I/Os 16 Features Interrupt pin Supply voltage (Min) (V) 4.5 Supply voltage (Max) (V) 5.5 Addresses 8 Rating Catalog Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85
Number of I/Os 16 Features Interrupt pin Supply voltage (Min) (V) 4.5 Supply voltage (Max) (V) 5.5 Addresses 8 Rating Catalog Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85
SOIC (DW) 24 160 mm² 15.5 x 10.3 SSOP (DB) 24 64 mm² 8.2 x 7.8 SSOP (DBQ) 24 52 mm² 8.65 x 6 TSSOP (PW) 24 34 mm² 4.4 x 7.8 TVSOP (DGV) 24 32 mm² 5 x 6.4 VQFN (RGE) 24 16 mm² 4 x 4
  • I2C to Parallel-Port Expander
  • Open-Drain Interrupt Output
  • Low Standby-Current Consumption of
    10 µA Maximum
  • Compatible With Most Microcontrollers
  • 400-kHz Fast I2C Bus
  • Address by Three Hardware Address Pins
    for Use of up to Eight Devices
  • Latched Outputs With High-Current Drive
    Capability for Directly Driving LEDs
  • Latch-Up Performance Exceeds 100 mA
    Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model
    • 200-V Machine Model
    • 1000-V Charged-Device Model
  • I2C to Parallel-Port Expander
  • Open-Drain Interrupt Output
  • Low Standby-Current Consumption of
    10 µA Maximum
  • Compatible With Most Microcontrollers
  • 400-kHz Fast I2C Bus
  • Address by Three Hardware Address Pins
    for Use of up to Eight Devices
  • Latched Outputs With High-Current Drive
    Capability for Directly Driving LEDs
  • Latch-Up Performance Exceeds 100 mA
    Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model
    • 200-V Machine Model
    • 1000-V Charged-Device Model

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.

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.

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Technical documentation

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Type Title Date
* Data sheet PCF8575C Remote 16-Bit I2C AND SMBus Low-Power I/O Expander with Interrupt Output datasheet (Rev. F) 25 Jan 2015
Application note I2C Dynamic Addressing 25 Apr 2019
Application note Choosing the Correct I2C Device for New Designs 07 Sep 2016
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
Application note Understanding the I2C Bus 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation 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

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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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