Home Interface I2C & I3C ICs I2C general-purpose I/Os (GPIOs)

PCA9536

ACTIVE

4-bit 2.3- to 5.5-V I2C/SMBus I/O expander with config registers

Product details

Number of I/Os 4 Features Configuration registers Supply voltage (min) (V) 2.3 Supply voltage (max) (V) 5.5 Addresses 1 Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85
Number of I/Os 4 Features Configuration registers Supply voltage (min) (V) 2.3 Supply voltage (max) (V) 5.5 Addresses 1 Rating Catalog Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85
SOIC (D) 8 29.4 mm² 4.9 x 6 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Available in the Texas Instruments NanoFree™ Package
  • Low standby current consumption of 1 µA Max
  • I2C to parallel port expander
  • Operating power-supply voltage range of 2.3 V to 5.5 V
  • 5-V Tolerant I/O ports
  • 400-kHz fast I2C bus
  • Input and output configuration register
  • Polarity inversion register
  • Internal power-on reset
  • No glitch on power up
  • Power-up with all channels configured as inputs
  • Noise filter on SCL/SDA inputs
  • Latched outputs with high-current drive maximum 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 (A114-A)
    • 200-V Machine model (A115-A)
    • 1000-V Charged-device model (C101)
  • Available in the Texas Instruments NanoFree™ Package
  • Low standby current consumption of 1 µA Max
  • I2C to parallel port expander
  • Operating power-supply voltage range of 2.3 V to 5.5 V
  • 5-V Tolerant I/O ports
  • 400-kHz fast I2C bus
  • Input and output configuration register
  • Polarity inversion register
  • Internal power-on reset
  • No glitch on power up
  • Power-up with all channels configured as inputs
  • Noise filter on SCL/SDA inputs
  • Latched outputs with high-current drive maximum 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 (A114-A)
    • 200-V Machine model (A115-A)
    • 1000-V Charged-device model (C101)

This 4-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families through the I2C interface [serial clock (SCL), serial data (SDA)].

The PCA9536 features 4-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pullup to VCC. However, the system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. If no signals are applied externally to the PCA9536, the voltage level is 1, or high, because of the internal pullup resistors. The data for each input or output is stored in the corresponding Input Port or Output Port register. The polarity of the Input Port register can be inverted with the Polarity Inversion register and the system controller reads all registers.

The system controller resets the PCA9536 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I2C/SMBus state machine.

The device outputs (latched) have high-current drive capability for directly driving LEDs, but has low current consumption.

This 4-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families through the I2C interface [serial clock (SCL), serial data (SDA)].

The PCA9536 features 4-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pullup to VCC. However, the system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. If no signals are applied externally to the PCA9536, the voltage level is 1, or high, because of the internal pullup resistors. The data for each input or output is stored in the corresponding Input Port or Output Port register. The polarity of the Input Port register can be inverted with the Polarity Inversion register and the system controller reads all registers.

The system controller resets the PCA9536 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I2C/SMBus state machine.

The device outputs (latched) have high-current drive capability for directly driving LEDs, but has low current consumption.

Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 11
Type Title Date
* Data sheet PCA9536 Remote 4-Bit I2C and SMBus I/O Expander with Configuration Registers datasheet (Rev. H) PDF | HTML 28 Mar 2022
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application note I2C Dynamic Addressing 25 Apr 2019
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
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
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tool

I2C-DESIGNER — I2C designer tool

Use the I2C Designer tool to quickly resolve conflicts in addressing, voltage level and frequency in I2C based designs. Enter master and slave inputs to automatically generate an I2C tree or easily build a custom solution. This tool will help designers save time and comply with the I2C standard (...)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Reference designs

TIDEP0054 — Parallel Redundancy Protocol (PRP) Ethernet Reference Design for Substation Automation

This is a reference design for high-reliability, low-latency network communications for substation automation equipment in smart grid transmission and distribution networks. It supports the parallel redundancy protocol (PRP) specification in the IEC 62439 standard using the PRU-ICSS. This reference (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDEP0043 — Acontis EtherCAT Master Stack Reference Design

The acontis EC-Master EtherCAT Master stack is a highly portable software stack that can be used on various embedded platforms. The EC-Master supports the high performance TI Sitara MPUs,  it provides a sophisticated EtherCAT Master solution which customers can use to implement EtherCAT (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOIC (D) 8 Ultra Librarian
VSSOP (DGK) 8 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos