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Diodes Incorporated PI4IOE5V9555LEX
- Part No.:
- PI4IOE5V9555LEX
- Manufacturer:
- Diodes Incorporated
- Category:
- I/O Expanders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PI4IOE5V9555LEX.pdf
- Description:
- IC XPNDR 400KHZ I2C 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,854
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Product details
Overview
PI4IOE5V9555LEX from Diodes Incorporated is a 16-bit I²C/SMBus GPIO expander IC with 5V-tolerant I/Os, programmable input/output direction per pin, active-low open-drain interrupt output, and operation from 2.3V to 5.5V supply. It supports up to 400 kHz I²C clocking, includes polarity inversion registers, noise filtering on SCL/SDA, and power-on reset - used in ACPI power switches, push-button interfaces, LED/fan control, and sensor signal conditioning in embedded industrial and consumer systems.
For engineers reviewing the PI4IOE5V9555LEX datasheet, PI4IOE5V9555LEX pinout, PI4IOE5V9555LEX application, or PI4IOE5V9555LEX equivalent, key selection criteria include I²C address configurability (via A0–A2), 5V-tolerant I/O capability under 2.3V–5.5V VCC, interrupt-driven state-change detection, low standby current (≤1.5 mA), and dual-package availability (TSSOP-24 and TQFN-24) for space-constrained designs.
Technical Context
The PI4IOE5V9555LEX implements two independent 8-bit I/O ports (IO0_0–IO0_7 and IO1_0–IO1_7), each with dedicated configuration, polarity inversion, input, and output registers. Its I²C interface uses standard-mode (100 kHz) and fast-mode (400 kHz) timing compliance, including bus-free time, setup/hold requirements, and filtered SCL/SDA inputs to suppress ≤50 ns spikes.
Interrupt generation is edge-sensitive and tied exclusively to input-port state changes; reading the corresponding input port register clears the INT signal. Power-on reset initializes all registers to default states (I/Os as inputs with internal weak pull-ups to VCC), and VPOR threshold is 1.16–1.41 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V microcontrollers without level shifters. |
| I²C Clock Frequency | 0 Hz to 400 kHz - supports both standard and fast-mode I²C buses for flexible system integration. |
| I/O Voltage Tolerance | 5 V tolerant - allows safe connection to 5 V signals even when VCC = 2.3 V, eliminating external clamping diodes. |
| Interrupt Output | Active-low open-drain - simplifies wired-AND interrupt aggregation across multiple expanders on shared bus lines. |
| Standby Current | 0.25–1.5 mA at VCC = 5.5 V - enables low-power sleep modes in battery-backed or energy-conscious applications. |
| ESD Protection | 4 kV HBM / 1 kV CDM - meets industrial-grade robustness requirements for board-level handling and field operation. |
| Operating Temperature | −40 °C to +85 °C - qualified for extended-temperature industrial and commercial environments. |
Pinout & Package
PI4IOE5V9555LEX is offered in two RoHS-compliant, lead-free packages: 24-pin TSSOP (L) and 24-contact TQFN 4×4 mm (ZD). Both packages share identical pin functions and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (Pin 1 / TSSOP; Pin 22 / TQFN) | Open-drain interrupt output | Asserts low when any configured input pin changes state; requires external pull-up for proper logic level restoration. |
| A0–A2 (Pins 18, 2, 3 / TSSOP; Pins 21, 23, 24 / TQFN) | I²C slave address inputs | Select one of eight possible I²C addresses (0x20–0x27); enables up to eight devices on same bus for 128 total I/Os. |
| IO0_0–IO0_7 (Pins 4–11 / TSSOP; Pins 1–8 / TQFN) | Port 0 bidirectional I/Os | Individually configurable as input (high-Z + weak pull-up) or output (push-pull capable of sourcing/sinking ≥8 mA @ VCC ≥ 2.3 V). |
| IO1_0–IO1_7 (Pins 13–20 / TSSOP; Pins 10–17 / TQFN) | Port 1 bidirectional I/Os | Functionally identical to Port 0; supports independent polarity inversion and configuration register control. |
| SCL / SDA (Pins 22, 23 / TSSOP; Pins 19, 20 / TQFN) | I²C serial clock/data lines | Compliant with I²C bus electrical specifications including noise filtering (50 ns spike suppression) and fast-mode timing. |
| VCC / GND (Pins 24, 12 / TSSOP; Pins 21, 9 / TQFN) | Power supply and ground | Supports 2.3–5.5 V operation; GND pin placement minimizes ground bounce in high-speed switching scenarios. |
Key Features
| Feature | Design Value |
|---|---|
| Individual I/O direction control | Each of 16 pins independently set as input or output via Configuration Registers 6–7 - enables mixed-signal peripheral interfacing without external logic. |
| Polarity inversion per I/O bit | Configurable via Polarity Inversion Registers 4–5 - eliminates need for software XOR or external inverters in active-low sensing paths. |
| Noise-filtered SCL/SDA inputs | Internal 50 ns spike suppression - improves I²C reliability in electrically noisy industrial enclosures or motor-drive proximity. |
| Power-on reset with defined VPOR | Resets all registers to known state (I/Os = inputs, outputs = high) when VCC crosses 1.16–1.41 V - ensures deterministic boot behavior. |
| 5V-tolerant I/Os at low VCC | Accepts up to 5.5 V on I/O pins while VCC = 2.3 V - enables seamless bridging between legacy 5 V peripherals and modern low-voltage MCUs. |
Applications
| ACPI Power Switch Interface | LED and Fan Control Panel |
|---|---|
|
Use Scenario: Monitoring mechanical power buttons and latches in laptops, docking stations, and industrial HMIs to trigger system wake/sleep transitions. IC Role / Device Role / Timing Role: GPIO expander providing debounced, interrupt-driven input capture for ACPI event signaling over I²C. Use Value: Reduces MCU GPIO count burden while enabling precise, low-latency wake-event detection with hardware-level interrupt assertion. |
Use Scenario: Driving multi-color status LEDs and PWM-controlled cooling fans in network appliances and storage enclosures. IC Role / Device Role / Timing Role: I²C-configurable output port delivering 8–24 mA per pin to drive LEDs directly or fan enable lines without discrete transistors. Use Value: Eliminates 16 discrete driver components and simplifies layout by consolidating control into single I²C transaction sequence. |
| Sensor Signal Conditioning Hub | Push-Button Keypad Expansion |
|
Use Scenario: Aggregating digital outputs from temperature, humidity, and motion sensors in smart building controllers. IC Role / Device Role / Timing Role: Input-port expander with polarity inversion and interrupt-on-change for asynchronous sensor state reporting. Use Value: Enables real-time, low-overhead polling avoidance - MCU wakes only on actual sensor activity, cutting average system power by >40%. |
Use Scenario: Scanning matrix keypads or discrete tactile switches in medical devices and test equipment front panels. IC Role / Device Role / Timing Role: Bidirectional I/O port supporting row/column scanning with programmable pull-ups and interrupt-triggered keypress detection. Use Value: Provides deterministic key-debounce timing and reduces firmware complexity by offloading scan logic to hardware registers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C GPIO expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9555D,118 (NXP) | Same 16-bit I²C I/O architecture but lacks 5V tolerance; max VCC = 5.5 V, I/Os limited to VCC voltage. | Requires level-shifting for 5 V peripherals; suitable only where all connected signals match VCC. | Choose PCA9555D if system operates strictly at 3.3 V and cost sensitivity outweighs 5V-tolerance requirement. |
| TCA6424ARGJR (TI) | Higher drive strength (25 mA sink/source), integrated 10 kΩ pull-ups, but no polarity inversion register. | Eliminates external pull-ups but requires software polarity handling; better for high-current loads like relays. | Prefer TCA6424ARGJR when driving heavier loads and board space for external resistors is constrained. |
Compared with PCA9555D and TCA6424ARGJR, PI4IOE5V9555LEX uniquely combines 5V-tolerant I/Os with polarity inversion and noise-filtered I²C lines - making it optimal for mixed-voltage industrial interfaces where signal integrity and peripheral compatibility are critical.
Availability
PI4IOE5V9555LEX is available at Aetrix Electronics and suitable for industrial HMIs, network appliance control panels, smart building sensor hubs, and medical device front-end interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for PI4IOE5V9555LEX 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 analog ICs, specializing in high-reliability, energy-efficient solutions for industrial, computing, and consumer markets.
The PI4IOE5V9555LEX belongs to Diodes' Pericom® I/O expansion product line, designed specifically to simplify system-level GPIO scaling in space-constrained, mixed-voltage embedded applications with strict ESD and noise immunity requirements.
FAQ
What is the maximum I²C clock frequency supported by PI4IOE5V9555LEX?
The PI4IOE5V9555LEX supports I²C fast mode up to 400 kHz, with guaranteed timing compliance for tLOW, tHIGH, tSU;DAT, and other critical parameters per the DS41303 Rev 1-2 specification. It also fully supports standard-mode (100 kHz) operation with built-in noise filtering on SCL/SDA lines.
Can PI4IOE5V9555LEX safely interface with 5 V signals while powered from 3.3 V?
Yes - all 16 I/O pins are 5 V tolerant, meaning they accept input voltages up to 5.5 V regardless of VCC (2.3–5.5 V). This allows direct connection to 5 V push buttons, LEDs, or sensors without external level-shifting circuitry, even when VCC = 3.3 V.
How does the interrupt output behave when multiple input pins change state?
The INT pin asserts low on *any* state change among enabled input pins and remains asserted until the corresponding input port register (Port 0 or Port 1) is read. Reading one port does not clear interrupts from the other port - both must be read independently to fully deassert INT.
What package options are available for PI4IOE5V9555LEX and how do they differ mechanically?
PI4IOE5V9555LEX is available in TSSOP-24 (L) and TQFN 4×4 mm–24 (ZD) packages. TSSOP offers through-hole-compatible footprint and easier manual rework; TQFN provides 60% smaller PCB area and improved thermal performance due to exposed thermal pad - both share identical pinout and electrical specs.
PI4IOE5V9555LEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- 16
- Interface:
- I2C
- Interrupt Output:
- Yes
- 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:
- 24-TSSOP
PI4IOE5V9555LEX FAQ
1.How can I place an order for PI4IOE5V9555LEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI4IOE5V9555LEX 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 PI4IOE5V9555LEX reliable?
The price and inventory of PI4IOE5V9555LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI4IOE5V9555LEX is usually 5 days.
3.What payment methods are accepted for PI4IOE5V9555LEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI4IOE5V9555LEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI4IOE5V9555LEX?
PI4IOE5V9555LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI4IOE5V9555LEX 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 PI4IOE5V9555LEX?
For technical support, including PI4IOE5V9555LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI4IOE5V9555LEX requirements.
6.How does Aetrix verify that PI4IOE5V9555LEX is sourced from the original manufacturer or authorized distributors?
All PI4IOE5V9555LEX 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 PI4IOE5V9555LEX meets industry standards.
7.What is the process for return or replacement of PI4IOE5V9555LEX?
All PI4IOE5V9555LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI4IOE5V9555LEX, 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 PI4IOE5V9555LEX part is unused and in its original packaging.
Return procedure for PI4IOE5V9555LEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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