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Diodes Incorporated PI4IOE5V9555ZDEX
- Part No.:
- PI4IOE5V9555ZDEX
- Manufacturer:
- Diodes Incorporated
- Category:
- I/O Expanders
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
PI4IOE5V9555ZDEX.pdf
- Description:
- IC XPNDR 400KHZ I2C 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,500
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Product details
Overview
PI4IOE5V9555ZDEX from Diodes Incorporated is a 16-bit I²C-bus/SMBus I/O expander with 5V-tolerant GPIOs, active-low open-drain interrupt output, and individual I/O direction/polarity configuration. It operates from 2.3V to 5.5V, supports up to 400 kHz clock frequency, and delivers 8 mA low-level drive per I/O at 2.3V. Used in ACPI power switches, push-button interfaces, LED/fan control, and sensor monitoring in space-constrained embedded systems.
For engineers reviewing the PI4IOE5V9555ZDEX datasheet, PI4IOE5V9555ZDEX pinout, PI4IOE5V9555ZDEX application, or PI4IOE5V9555ZDEX equivalent, key selection criteria include I²C address configurability (A0–A2), interrupt edge sensitivity on input state change, 5V tolerance on all I/Os, and dual-package availability (TQFN-24) for high-density PCB layouts.
Technical Context
The PI4IOE5V9555 implements two independent 8-bit I/O ports (Port 0 and Port 1), each with dedicated configuration, polarity inversion, input, and output registers. All registers are accessible via standard I²C read/write transactions using command-byte addressing.
Its interrupt logic activates only when an input-configured I/O changes state - not on output transitions - and clears upon reading the corresponding input port register. The device includes noise filtering on SCL/SDA inputs and a power-on reset that initializes all I/Os as high-impedance inputs with internal weak pull-ups to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3V to 5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level shifters. |
| I/O Drive Strength | 8 mA sink @ VOL = 0.5V (VCC = 2.3V) - sufficient to directly drive LEDs or small logic loads. |
| I²C Clock Frequency | 0 Hz to 400 kHz - supports Fast Mode I²C for responsive host communication in real-time control loops. |
| Interrupt Output | Active-low open-drain - allows wired-OR connection with multiple expanders or system interrupt controllers. |
| ESD Protection | 4 kV HBM, 1 kV CDM - meets industrial-grade robustness requirements for board-level ESD immunity. |
| Input Capacitance | 3.7 pF typical - minimizes signal distortion and timing skew on high-speed I²C buses. |
| Power-On Reset Threshold | 1.16V to 1.41V - ensures reliable initialization across wide VCC ramp rates and supply tolerances. |
Pinout & Package
PI4IOE5V9555ZDEX is packaged in a 4×4 mm, 0.5 mm pitch TQFN-24 (ZD) package with exposed thermal pad. Pin numbering follows top-view orientation per Diodes' mechanical drawing ZD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (Pin 1) | Open-drain interrupt output | Asserts low when any input-configured I/O changes state; requires external pull-up for proper logic level. |
| A0–A2 (Pins 18, 2, 3) | I²C slave address inputs | Set 3-bit address bits (A2:A0) to select one of eight possible I²C addresses (0x20–0x27). |
| SCL (Pin 19) | I²C serial clock input | Accepts standard-mode (100 kHz) or fast-mode (400 kHz) clock; includes internal noise filter. |
| SDA (Pin 20) | I²C serial data bidirectional line | Open-drain interface compatible with multi-master I²C buses; filtered for noise immunity. |
| VCC (Pin 24) | Positive supply input | Supplies core logic and I/O buffers; decoupling capacitor required within 1 cm of pin. |
| GND (Pin 12) | Ground reference | Common return path for all digital and I/O currents; must be connected to low-impedance PCB ground plane. |
| IO0_0–IO0_7 (Pins 4–11) | Port 0 general-purpose I/O | Individually configurable as input (high-Z + weak pull-up) or output (push-pull capable of 8 mA sink). |
| IO1_0–IO1_7 (Pins 13–17, 21–23) | Port 1 general-purpose I/O | Same functionality as Port 0; independent configuration and polarity inversion registers. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/Os | Withstand up to 5.5V on any I/O pin regardless of VCC (2.3V–5.5V), enabling mixed-voltage system interfacing. |
| Polarity inversion registers | Per-bit inversion of input port data allows software-defined active-high/active-low signal interpretation without hardware changes. |
| Low standby current | 0.25 µA typical at VCC = 5.5V with all I/Os as inputs - critical for battery-powered IoT endpoint designs. |
| Configurable I²C address | Three address pins (A0–A2) support up to eight devices on same bus - scalable for multi-sensor or multi-peripheral nodes. |
| Noise-filtered SCL/SDA | Internal filtering rejects pulses <50 ns - suppresses EMI-induced glitches in electrically noisy industrial environments. |
Applications
| ACPI Power Management | Industrial Push-Button Interface |
|---|---|
|
Use Scenario: Monitoring power button presses and lid-open/closed states in laptops and embedded PCs. IC Role / Device Role / Timing Role: I/O expander providing debounced, interrupt-driven GPIO inputs to host EC or PMIC. Use Value: Reduces host processor polling overhead via edge-triggered INT signal and eliminates need for external debounce circuitry. |
Use Scenario: Reading status of mechanical push buttons and toggle switches in factory HMIs and control panels. IC Role / Device Role / Timing Role: Parallel-to-serial GPIO interface with configurable pull-ups and interrupt-on-change capability. Use Value: Enables single I²C bus to monitor up to 128 discrete inputs across eight expanders, simplifying wiring and firmware. |
| LED & Fan Control | Sensor Signal Conditioning |
|
Use Scenario: Driving status LEDs and PWM-controlled cooling fans in network switches and storage enclosures. IC Role / Device Role / Timing Role: Output-expansion hub with 8 mA per I/O sink strength and polarity-invertable outputs. Use Value: Directly drives LEDs without series resistors at 3.3V, and supports fan tach feedback via input-capable I/Os. |
Use Scenario: Interfacing analog sensor enable lines, digital alarm flags, and calibration switch settings in environmental monitors. IC Role / Device Role / Timing Role: Level-shifting and signal aggregation interface between 5V sensors and 3.3V microcontrollers. Use Value: 5V-tolerant inputs accept TTL/CMOS sensor outputs; polarity inversion accommodates inverted alarm logic without PCB redesign. |
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 = 5.5V, I/Os rated only to VCC. | Requires level shifting when interfacing with 5V sensors or peripherals; unsuitable for mixed-voltage domains without added components. | Select when system operates exclusively at 3.3V and cost sensitivity outweighs voltage flexibility. |
| TCA6424AIPWR (TI) | Higher drive (25 mA sink), wider VCC range (1.65V–5.5V), but no built-in noise filtering on SCL/SDA. | Better suited for driving higher-current loads like relays, but more susceptible to I²C bus noise in EMI-heavy environments. | Select when stronger output drive is mandatory and board-level filtering can be added externally. |
Compared with PCA9555D and TCA6424AIPWR, PI4IOE5V9555ZDEX uniquely combines 5V-tolerant I/Os, integrated SCL/SDA noise filtering, and ultra-low standby current - making it optimal for compact, mixed-voltage, noise-sensitive industrial and computing peripherals.
Availability
PI4IOE5V9555ZDEX is available at Aetrix Electronics and suitable for industrial HMIs, embedded PC power management, and IoT sensor node design requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for PI4IOE5V9555ZDEX 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The PI4IOE5V9555 belongs to Diodes' Pericom® I/O expansion portfolio, designed specifically for space-constrained, low-power embedded systems needing flexible, robust, and voltage-agile GPIO extension over I²C.
FAQ
What is the maximum number of PI4IOE5V9555ZDEX devices supported on a single I²C bus?
Eight devices can share one I²C bus using address pins A0–A2, yielding up to 128 total I/O lines. Each device occupies a unique 7-bit address from 0x20 to 0x27, and all support standard and fast-mode I²C timing without arbitration conflicts.
Does PI4IOE5V9555ZDEX require external pull-up resistors on SDA and SCL lines?
Yes - SDA and SCL are open-drain and require external pull-up resistors to VCC. Recommended values are 2.2 kΩ for 100 kHz and 1 kΩ for 400 kHz operation, sized to meet rise-time specifications while minimizing bus capacitance loading.
Can PI4IOE5V9555ZDEX I/O pins be used as analog inputs?
No - all 16 I/Os are strictly digital. They lack ADC functionality, analog multiplexing, or rail-to-rail input voltage measurement capability. The device supports only logic-level input detection and CMOS/TTL-compatible output driving.
How is the interrupt cleared after it triggers?
The INT pin de-asserts automatically only when the corresponding input port register (Port 0 or Port 1) is read via I²C. Reading one port does not clear interrupts from the other port - both must be read independently to fully clear pending events.
PI4IOE5V9555ZDEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- 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-TQFN (4x4)
PI4IOE5V9555ZDEX FAQ
1.How can I place an order for PI4IOE5V9555ZDEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI4IOE5V9555ZDEX 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 PI4IOE5V9555ZDEX reliable?
The price and inventory of PI4IOE5V9555ZDEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI4IOE5V9555ZDEX is usually 5 days.
3.What payment methods are accepted for PI4IOE5V9555ZDEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI4IOE5V9555ZDEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI4IOE5V9555ZDEX?
PI4IOE5V9555ZDEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI4IOE5V9555ZDEX 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 PI4IOE5V9555ZDEX?
For technical support, including PI4IOE5V9555ZDEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI4IOE5V9555ZDEX requirements.
6.How does Aetrix verify that PI4IOE5V9555ZDEX is sourced from the original manufacturer or authorized distributors?
All PI4IOE5V9555ZDEX 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 PI4IOE5V9555ZDEX meets industry standards.
7.What is the process for return or replacement of PI4IOE5V9555ZDEX?
All PI4IOE5V9555ZDEX units undergo pre-shipment inspection (PSI). If there is an issue with PI4IOE5V9555ZDEX, 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 PI4IOE5V9555ZDEX part is unused and in its original packaging.
Return procedure for PI4IOE5V9555ZDEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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