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NXP Semiconductors PCA9554AN,112
- Part No.:
- PCA9554AN,112
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
PCA9554AN,112.pdf
- Description:
- IC XPNDR 400KHZ I2C SMBUS 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,050
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Product details
Overview
PCA9554AN,112 from NXP Semiconductors is an 8-bit I²C-bus/SMBus GPIO expander in SO16 package, supporting 2.3 V to 5.5 V supply, 5 V-tolerant I/Os, and 400 kHz clock frequency. It provides configurable input/output pins, polarity inversion, and active-low open-drain interrupt output for ACPI power switches, LED control, sensor interfacing, and push-button monitoring in embedded systems.
For engineers reviewing the PCA9554AN,112 datasheet, PCA9554AN,112 pinout, PCA9554AN,112 application, or PCA9554AN,112 equivalent, key selection considerations include I²C address configuration (A0–A2), register-level I/O direction control, interrupt behavior on input state change, and compatibility with legacy PCF8574-based firmware requiring software adaptation per AN469.
Technical Context
The PCA9554AN,112 implements a synchronous I²C slave interface with four internal registers: Configuration (R/W, default all inputs), Input Port (read-only), Output Port (R/W), and Polarity Inversion (R/W). Its interrupt logic activates only when an input pin's physical state differs from its latched value in the Input Port register - not on output changes or configuration writes.
Each I/O features a weak 100 kΩ pull-up to VDD at reset, 5 V tolerance regardless of VDD level, and bidirectional capability controlled per-bit via the Configuration register. The device includes noise filtering on SCL/SDA, internal power-on reset (VPOR = 1.7–2.2 V), and no glitch on power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3 V to 5.5 V - supports mixed-voltage system integration with 5 V-tolerant I/Os even at 2.3 V core supply |
| I²C Clock Frequency | 0 Hz to 400 kHz - compatible with Fast-mode I²C buses without external clock stretching |
| Interrupt Output | Active-low open-drain - requires external pull-up; asserts when any configured input pin state differs from Input Port register |
| Standby Current | 0.25 µA typical (VDD = 5.5 V, VI = VDD) - enables ultra-low-power monitoring in battery-backed subsystems |
| I/O Drive Strength | 10 mA sink per pin (VOL = 0.5 V, VDD = 4.5 V) - sufficient to directly drive LEDs or small logic loads without buffering |
| ESD Protection | 2000 V HBM, 1000 V CDM - meets industrial-grade robustness requirements per JESD22 standards |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and extended commercial environments |
Pinout & Package
PCA9554AN,112 is supplied in SO16 (SOT162-1) package: plastic small outline, 16 leads, 7.5 mm body width, standard marking, tube packing. Pin 1 is index-marked; pin 8 is VSS (ground); pin 16 is VDD (supply).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Hardware Address Input | LSB of 3-bit I²C slave address; sets bit 1 of fixed 0100xxx address (PCA9554 series) |
| 2 (A1) | Hardware Address Input | Mid-bit of 3-bit I²C slave address; enables up to eight PCA9554 devices on one bus |
| 3 (A2) | Hardware Address Input | MSB of 3-bit I²C slave address; no effect on PCA9554A-series devices (different base address) |
| 4–7, 9–12 (IO0–IO7) | Configurable I/O Terminal | Bi-directional; default high-impedance input with 100 kΩ pull-up; configurable as output via Configuration register |
| 8 (VSS) | Ground Reference | Primary supply ground; must be connected to system GND for proper operation and ESD path |
| 13 (INT) | Interrupt Output | Open-drain, active-low signal asserted when input pin state diverges from Input Port register value |
| 14 (SCL) | I²C Clock Input | Input with integrated noise filter; accepts standard I²C timing (tLOW ≥ 1.3 µs in Fast-mode) |
| 15 (SDA) | I²C Data I/O | Open-drain bidirectional line with noise filter; shares bus with other I²C devices |
| 16 (VDD) | Power Supply | 2.3–5.5 V main supply; powers internal logic and I/O buffers; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Polarity Inversion Register | Per-bit inversion of Input Port read data - enables active-HIGH or active-LOW interpretation of switch/sensor inputs without firmware logic |
| Individual I/O Configuration | 8-bit Configuration register allows mixed input/output assignment per pin - supports heterogeneous peripheral interfaces on single device |
| Noise-Filtered I²C Interface | SCL/SDA inputs include built-in filtering - suppresses spikes ≤50 ns, reducing false ACKs or bus errors in electrically noisy environments |
| Internal Power-On Reset | Automatic initialization to known state (all I/Os as inputs, registers cleared) - eliminates need for external POR circuitry |
| 5 V-Tolerant I/Os | I/O pins accept up to 5.5 V regardless of VDD level - simplifies level-shifting in mixed-supply systems with 5 V sensors or actuators |
Applications
| Industrial Push-Button Panel | LED Status Indicator Bank |
|---|---|
Use Scenario: Monitoring mechanical push buttons across a 16-button control panel in factory HMIs. IC Role / Device Role / Timing Role: GPIO expander providing debounced, interrupt-driven input capture via INT pin; I²C polling minimized by event-triggered wake-up. Use Value: Reduces host MCU GPIO usage by 8 pins; enables immediate response to button press without continuous polling; 5 V tolerance accommodates legacy 5 V button circuits. |
Use Scenario: Driving 8 discrete status LEDs (power, fault, comms, etc.) on a network switch management card. IC Role / Device Role / Timing Role: Output port controller with configurable drive strength; outputs updated via I²C write to Output Port register. Use Value: Eliminates need for discrete transistors or shift registers; 10 mA sink per pin directly drives standard LEDs; polarity inversion allows common-anode or common-cathode layouts. |
| Temperature Sensor Interface Hub | Fan Speed Control & Monitoring |
Use Scenario: Aggregating digital alarm signals (e.g., overtemp flags) from multiple analog temperature sensors in HVAC controllers. IC Role / Device Role / Timing Role: Input aggregator with interrupt generation - each sensor's ALARM output wired to separate IOx pin; INT asserts on any overtemp event. Use Value: Single I²C transaction reads all 8 alarms post-interrupt; reduces bus traffic vs. polling individual sensors; 100 kΩ pull-ups simplify wiring to open-collector sensor outputs. |
Use Scenario: Monitoring tachometer feedback and controlling PWM speed of 4 DC fans in server chassis thermal management. IC Role / Device Role / Timing Role: Mixed I/O: IO0–IO3 as fan tach inputs (configured as inputs), IO4–IO7 as PWM enable/control outputs (configured as outputs). Use Value: Enables synchronized fan control and fault detection using one IC; interrupt alerts on tach loss (fan stall); 5 V tolerance matches typical fan tach signal levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar GPIO expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9554D,112 | Identical functionality and pinout; same SO16 package and 0100xxx I²C address range; differs only in top-side marking ("PCA9554D" vs "PCA9554AN") | No functional difference; both support same voltage, timing, and register set; suitable for identical use cases | Select PCA9554D,112 if standard NXP part numbering is required; PCA9554AN,112 is functionally interchangeable with no design changes |
| TCA9534APWR | TI device with same 8-bit I²C GPIO architecture but different I²C address (00100xx), no polarity inversion register, and lower max sink current (8 mA vs 10 mA) | Lacks polarity inversion - requires firmware handling of active-low sensor inputs; lower drive limits LED brightness or fan control range | Choose TCA9534APWR only if strict TI sourcing is mandated; PCA9554AN,112 offers superior flexibility with polarity control and higher drive |
Compared with PCA9554D,112, the PCA9554AN,112 offers identical electrical and functional behavior but with distinct traceability marking; versus TCA9534APWR, it delivers enhanced configurability via polarity inversion and 25% higher output drive - critical for direct LED/fan interfacing without external components.
Availability
PCA9554AN,112 is available at Aetrix Electronics and suitable for industrial HMI panels, LED status indicator banks, and sensor interface hubs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCA9554AN,112 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in I²C ecosystem components.
The PCA9554AN,112 belongs to NXP's I²C-bus I/O expander product line, designed specifically to extend microcontroller GPIO resources in space-constrained, low-power embedded systems while maintaining SMBus compliance and industrial reliability.
FAQ
What is the I²C slave address of PCA9554AN,112?
The PCA9554AN,112 uses a fixed 7-bit I²C slave address of 0x20 (0100000b) with hardware-selectable bits A0–A2. The base address is 0100xxx, where xxx is determined by A2/A1/A0 logic levels. This differs from the PCA9554A series (base 0111xxx), ensuring coexistence on the same bus.
Does PCA9554AN,112 require external pull-up resistors on SCL/SDA lines?
Yes, PCA9554AN,112 requires external pull-up resistors on both SCL and SDA lines as specified by I²C bus standards. The device itself does not integrate pull-ups on these lines; typical values are 2–10 kΩ depending on bus capacitance and speed (100 kHz or 400 kHz).
How does the interrupt (INT) pin behave on PCA9554AN,112?
The INT pin on PCA9554AN,112 is an active-low open-drain output that asserts when any I/O pin configured as an input changes state relative to its latched value in the Input Port register. It de-asserts automatically upon reading the Input Port register or when the pin returns to its prior state.
Can PCA9554AN,112 drive LEDs directly?
Yes, PCA9554AN,112 can drive standard LEDs directly: each I/O pin supports up to 10 mA sink current (VOL = 0.5 V at VDD = 4.5 V), sufficient for indicator LEDs. Configure the pin as output via the Configuration register and write '0' to illuminate (common-anode) or '1' with external pull-up (common-cathode).
Is PCA9554AN,112 pin-compatible with PCF8574 devices?
PCA9554AN,112 is pin-to-pin compatible with PCF8574 series devices in SO16 package and shares the same I²C address structure, but software changes are required due to differences in register map (e.g., added Polarity Inversion register) and interrupt behavior - detailed in Application Note AN469.
PCA9554AN,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 8
- Interface:
- I2C, SMBus
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 10mA, 25mA
- Clock Frequency:
- 400 kHz
- Voltage - Supply:
- 2.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
PCA9554AN,112 FAQ
1.How can I place an order for PCA9554AN,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9554AN,112 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 PCA9554AN,112 reliable?
The price and inventory of PCA9554AN,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9554AN,112 is usually 5 days.
3.What payment methods are accepted for PCA9554AN,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9554AN,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9554AN,112?
PCA9554AN,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9554AN,112 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 PCA9554AN,112?
For technical support, including PCA9554AN,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9554AN,112 requirements.
6.How does Aetrix verify that PCA9554AN,112 is sourced from the original manufacturer or authorized distributors?
All PCA9554AN,112 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 PCA9554AN,112 meets industry standards.
7.What is the process for return or replacement of PCA9554AN,112?
All PCA9554AN,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9554AN,112, 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 PCA9554AN,112 part is unused and in its original packaging.
Return procedure for PCA9554AN,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9554AN,112 Tags
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FXL6408UMX
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PCF8574ADWR
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TCA9554PWR
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TCA9554APWR
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TCA9555RTWR
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