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Home > Products > Integrated Circuits (ICs) > Interface > I/O Expanders

Diodes Incorporated PI4IOE5V9557LEX

Name: PI4IOE5V9557LEX
Brand: Diodes Incorporated
SKU: PI4IOE5V9557LEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI4IOE5V9557LEX

Manufacturer:: Diodes Incorporated

Category:: I/O Expanders

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: PI4IOE5V9557LEX.pdf

Description:: IC XPNDR 400KHZ I2C 16TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI4IOE5V9557 from Diodes Incorporated is an 8-bit I²C/SMBus GPIO expander with active-low reset, 5V-tolerant I/Os, 2.3V–5.5V supply operation, and TSSOP-16 package. It serves as a parallel I/O extension for microcontroller systems in ACPI power switches, LED/fan control, push-button interfaces, and sensor signal conditioning.

For engineers reviewing the PI4IOE5V9557 datasheet, PI4IOE5V9557 pinout, PI4IOE5V9557 application, or PI4IOE5V9557 equivalent, key selection criteria include I²C address configurability (A0–A2), polarity inversion register, open-drain IO0 output capability, 400 kHz Fast Mode support, and integrated noise filtering on SCL/SDA lines.

Technical Context

The device implements an I²C slave interface with fixed 7-bit base address (0x30–0x37) selectable via A0–A2 pins and supports Standard (100 kHz) and Fast Mode (400 kHz) clock rates. Its internal register map includes Input Port (read-only), Output Port (read/write), Polarity Inversion (read/write), and Configuration (read/write) registers - all accessible over the same I²C bus.

Power-on reset (VPOR = 1.16–1.41 V) and external active-low RESET pin independently initialize register states and the I²C state machine to defaults without cycling VCC. IO0 is open-drain with 1 µA high-level leakage at 4.6 V, while IO1–IO7 support 8–10 mA sink current at 2.3 V and 4 mA source current at 2.4 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.3 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V logic domains without level shifters.
I²C Clock Frequency	0–400 kHz - supports Fast Mode for higher throughput in time-critical I/O expansion tasks.
I/O Drive Strength	IO0: 1 µA max high-level leakage at 4.6 V; IO1–IO7: 8–10 mA sink, 4 mA source - suitable for driving LEDs, small relays, and logic inputs.
Input Tolerance	5 V tolerant on all I/O pins - allows safe connection to 5 V peripherals even when VCC = 3.3 V.
Reset Function	Active-low RESET pin with 25 ns minimum pulse width - enables synchronous initialization without power cycling.
ESD Protection	4 kV HBM, 1 kV CDM - meets industrial-grade robustness requirements for board-level ESD immunity.
Operating Temperature	−40 °C to +85 °C - qualified for extended commercial and industrial ambient environments.

Pinout & Package

Package: 16-pin TSSOP (173 mil wide), RoHS-compliant, lead-free, halogen- and antimony-free "Green" construction.

Pin/Terminal	Circuit Role	Design Meaning
1 (SCL)	I²C Serial Clock Input	Accepts master-generated clock up to 400 kHz; includes internal noise filter for reliable timing in noisy environments.
2 (SDA)	I²C Serial Data Bidirectional	Open-drain I/O shared across multiple slaves; requires external pull-up resistor to VCC.
3–5 (A0, A1, A2)	I²C Address Select Inputs	Set LSBs of 7-bit slave address (0x30–0x37); must be externally pulled HIGH/LOW - no internal pull-ups.
6 (IO0)	Open-Drain I/O Bit 0	Configurable as input or output; open-drain structure enables wired-AND logic and 5 V tolerant pull-up compatibility.
7–14 (IO1–IO7)	Push-Pull I/O Bits 1–7	Individually configurable as input or output; support bidirectional data flow with polarity inversion per bit.
8 (GND)	Supply Ground Reference	Primary return path for VCC and all I/O currents; must be low-impedance connection to system ground plane.
15 (RESET)	Active-Low Reset Input	Holding LOW for ≥25 ns forces register and I²C state machine into default configuration without de-powering.
16 (VCC)	Positive Supply Input	Accepts 2.3–5.5 V; powers internal logic and I/O drivers; decoupling capacitor required near pin.

Key Features

Feature	Design Value
Individual I/O Configuration Register	Each of 8 bits can be set as input (high-Z) or output (push-pull/open-drain) via dedicated Configuration register (Register 3).
Polarity Inversion Register	Per-bit inversion of input logic levels enables hardware-level signal inversion without software toggling - useful for active-low sensors or buttons.
Noise Filtering on SCL/SDA	Internal digital filtering suppresses spikes ≤50 ns - improves I²C reliability in electrically noisy industrial or motor-control environments.
Low Standby Current	0.25–1 µA standby current at 5.5 V - supports battery-powered applications requiring extended sleep duration.
Hardware Address Selection	Three address pins (A0–A2) allow up to eight identical devices on one I²C bus - simplifies multi-node I/O expansion without software address management.

Applications

ACPI Power Management

LED & Fan Control

Use Scenario: Managing system power states (S0–S5) in embedded PCs and industrial controllers using hardware-triggered wake events.

IC Role / Device Role / Timing Role: GPIO expander providing dedicated, interrupt-capable inputs for power button, lid switch, and thermal shutdown signals.

Use Value: Enables precise hardware-level power sequencing without MCU polling; 5 V tolerance allows direct connection to legacy ATX power supply signaling.

Use Scenario: Driving status LEDs and PWM-controlled cooling fans in network equipment and edge gateways.

IC Role / Device Role / Timing Role: Parallel I/O extension delivering synchronized LED on/off and fan speed control via I²C command bursts.

Use Value: Reduces MCU GPIO count pressure; open-drain IO0 supports common-anode LED configurations; 8–10 mA sink current drives standard indicator LEDs directly.

Industrial Sensor Interface

Push-Button Panel Interface

Use Scenario: Reading discrete status from temperature, motion, or limit-switch sensors in factory automation panels.

IC Role / Device Role / Timing Role: Digital input aggregator converting multiple 5 V sensor outputs into a single I²C-accessible byte.

Use Value: 5 V tolerance eliminates need for external level shifters; polarity inversion register accommodates both active-high and active-low sensor outputs.

Use Scenario: Scanning mechanical push buttons on human-machine interface (HMI) panels with debounce and state tracking.

IC Role / Device Role / Timing Role: Input port register captures real-time button states; configuration register sets all pins as inputs with pull-up emulation via external resistors.

Use Value: Eliminates MCU pin scarcity; noise filtering on SCL/SDA prevents false I²C interrupts during button bounce transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar GPIO expander applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PCA9555D,118 (NXP)	Same 16-pin TSSOP, 8-bit I²C GPIO, but lacks open-drain IO0; only push-pull outputs; no polarity inversion register.	Requires external inverters for active-low sensor inputs; less flexible for mixed-signal panel interfaces.	Select if cost sensitivity outweighs need for polarity inversion or open-drain flexibility.
TCA6408AIPWR (TI)	8-bit I²C expander with interrupt output and 1.65–5.5 V supply; includes built-in weak pull-ups on inputs; no open-drain IO0.	Interrupt-driven polling reduces I²C traffic; weak pull-ups simplify button interface but limit drive strength.	Prefer when interrupt-based event handling is critical and external pull-ups are undesirable.

Compared with PCA9555D and TCA6408A, the PI4IOE5V9557 uniquely combines open-drain IO0, per-bit polarity inversion, and 5 V tolerance at 2.3 V VCC - enabling direct integration with legacy 5 V peripherals and reducing BOM count in mixed-voltage systems.

Availability

PI4IOE5V9557 is available at Aetrix Electronics and suitable for ACPI power management, LED/fan control, industrial sensor aggregation, and push-button HMI applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for PI4IOE5V9557 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in high-performance, high-reliability components for industrial, computing, and consumer markets.

The PI4IOE5V9557 belongs to Diodes' I/O expansion product line, designed specifically for space-constrained, mixed-voltage embedded systems needing robust, low-power GPIO extension with hardware configurability and industrial-grade ESD protection.

FAQ

What is the function of the polarity inversion register?

The polarity inversion register (Register 2) allows individual I/O bits configured as inputs to have their logic sense inverted - e.g., a high-to-low transition on a physical pin reads as a logical '1' instead of '0'. This eliminates software-level bit-flipping for active-low sensors or switches, reducing firmware overhead and improving real-time response consistency.

Can IO0 be used as a standard push-pull output?

No - IO0 is internally implemented as an open-drain output only, with 1 µA maximum high-level leakage at 4.6 V. It cannot source significant current and requires an external pull-up resistor to define the high state. This architecture enables wired-AND logic, level translation, and safe interfacing with 5 V buses regardless of VCC voltage.

How does the RESET pin differ from power-on reset?

The RESET pin provides asynchronous, active-low hardware reset that reinitializes all registers and the I²C state machine to default values without removing VCC. Unlike power-on reset - which triggers only during VCC ramp-up above VPOR (1.16–1.41 V) - RESET works at any stable VCC and requires only a ≥25 ns LOW pulse, enabling controlled recovery from communication errors or firmware hangs.

Is the device qualified for automotive use?

No - the PI4IOE5V9557 is specified for −40 °C to +85 °C operation and carries industrial-grade qualification only. It is not AEC-Q100 qualified, nor manufactured in IATF 16949-certified facilities. For automotive applications, Diodes offers separate AEC-Q100 qualified variants (e.g., PI4IOE5V9557Q), which require explicit PPAP documentation and change control.

PI4IOE5V9557LEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Number of I/O:: 8

Interface:: I2C

Interrupt Output:: No

Features:: -

Output Type:: -

Current - Output Source/Sink:: -

Clock Frequency:: 400 kHz

Voltage - Supply:: 2.3V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

PI4IOE5V9557LEX FAQ

1.How can I place an order for PI4IOE5V9557LEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI4IOE5V9557LEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PI4IOE5V9557LEX reliable?

The price and inventory of PI4IOE5V9557LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI4IOE5V9557LEX is usually 5 days.

3.What payment methods are accepted for PI4IOE5V9557LEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI4IOE5V9557LEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI4IOE5V9557LEX?

PI4IOE5V9557LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI4IOE5V9557LEX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PI4IOE5V9557LEX?

For technical support, including PI4IOE5V9557LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI4IOE5V9557LEX requirements.

6.How does Aetrix verify that PI4IOE5V9557LEX is sourced from the original manufacturer or authorized distributors?

All PI4IOE5V9557LEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PI4IOE5V9557LEX meets industry standards.

7.What is the process for return or replacement of PI4IOE5V9557LEX?

All PI4IOE5V9557LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI4IOE5V9557LEX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PI4IOE5V9557LEX part is unused and in its original packaging.

Return procedure for PI4IOE5V9557LEX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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