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HomeProductsIntegrated Circuits (ICs)Interface - I/O ExpandersPCA9555DGVR
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PCA9555DGVR - Texas Instruments

Manufacturer Part Number
PCA9555DGVR
Manufacturer
Texas Instruments
Allelco Part Number
98D-PCA9555DGVR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
49,628 pcs available, New & Original
Parts Description
IC XPND 400KHZ I2C SMBUS 24TVSOP
Package
24-TVSOP
Data sheet
PCA9555DGVR.pdf

HTML Datasheet

PCA9555.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 49628
  • Unit Price: $2.848
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $2.848 $2.85
200+ $1.102 $220.40
500+ $1.064 $532.00
1000+ $1.045 $1,045.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

PCA9555DGVR Tech Specifications
Texas Instruments - PCA9555DGVR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - PCA9555DGVR

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply 2.3V ~ 5.5V
Supplier Device Package 24-TVSOP
Series -
Package / Case 24-TFSOP (0.173', 4.40mm Width)
Package Tape & Reel (TR)
Output Type Push-Pull
Operating Temperature -40°C ~ 85°C
Product Attribute Attribute Value
Number of I/O 16
Mounting Type Surface Mount
Interrupt Output Yes
Interface I²C, SMBus
Features POR
Current - Output Source/Sink 10mA, 25mA
Clock Frequency 400 kHz
Base Product Number PCA9555

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the PCA9555DGVR compare to other I2C I/O expanders in terms of drive strength and voltage compatibility for mixed-voltage system integration?
The PCA9555DGVR supports a supply voltage range of 2.3V to 5.5V, making it suitable for interfacing between 3.3V and 5V systems without level shifting. Its push-pull outputs provide source and sink currents of up to 10mA and 25mA respectively, enabling direct driving of LEDs or pull-up resistors without additional buffering. This contrasts with devices limited to lower current outputs or narrower voltage ranges, which may require external components for reliable operation in multi-supply environments.
What design considerations are critical when using the PCA9555DGVR in a system requiring hot-swapping capability?
The PCA9555DGVR includes an integrated power-on reset (POR) circuit that helps stabilize register states during power sequencing. However, because it lacks built-in hot-swap protection such as slew-rate control or overcurrent detection, external circuitry—typically a hot-swap controller or series resistor with a TVS diode—is recommended when connecting to inductive loads or long cables. The device’s open-drain interrupt pin can signal fault conditions, but mitigation must be implemented at the board level to prevent latch-up or data corruption during live insertion.
Can the PCA9555DGVR safely interface with 5V logic peripherals when powered from a 3.3V rail?
Yes, the PCA9555DGVR can accept 5V signals on its input pins even when VCC is 3.3V, due to its 5.5V maximum supply rating and robust ESD protection. This allows safe communication with 5V-compatible sensors or switches without requiring bidirectional level translators. However, output levels will remain at the 3.3V rail potential, so if those outputs drive 5V inputs directly, margin must be verified per target device specifications.
What is the impact of clock stretching on I2C communication speed when using the PCA9555DGVR in a high-latency slave environment?
The PCA9555DGVR operates at standard 400 kHz I2C mode and fully supports clock stretching as defined by the SMBus specification. In applications where downstream slaves stretch the SCL line beyond typical durations, the master must accommodate this behavior to avoid timeouts. While the expander itself handles internal timing transparently, system-level delays increase proportionally with stretching intervals, potentially reducing overall bus throughput by up to 50% under extreme conditions.
How does the interrupt feature of the PCA9555DGVR improve responsiveness compared to polling-based approaches?
Unlike polling methods that repeatedly read GPIO states, the PCA9555DGVR provides active-low interrupt output signaling changes in any of its 16 input lines. This reduces CPU load by eliminating periodic register reads and enables immediate event handling. For example, in a touchpad interface application, response latency drops from ~1 ms (polling every 1 ms) to near-zero when an interrupt triggers on button press, improving user experience and battery efficiency in portable designs.
Is the PCA9555DGVR compatible with automotive-grade temperature requirements, and what modifications might be needed for harsh environments?
The PCA9555DGVR is rated for -40°C to +85°C, which covers many industrial applications but falls short of AEC-Q100 Grade 2 (-40°C to +105°C). While functional in non-automotive environments, prolonged exposure above 85°C may degrade reliability. For extended thermal stress, derating output current or adding heatsinking near the package improves longevity. Additionally, conformal coating should be avoided unless qualified, as moisture ingress could affect solder joint integrity over time.
What are the limitations of using the PCA9555DGVR in systems requiring galvanic isolation?
The PCA9555DGVR offers no inherent electrical isolation between input/output channels or between the I2C bus and local power domain. Attempting to use it across isolated rails risks ground loops, noise coupling, or damage during transients. Instead, opt for dedicated isolated I/O expanders or digital isolators like TI’s ISO77xx series in conjunction with the PCA9555DGVR for signal translation only, ensuring proper creepage and clearance compliance per safety standards.
How does the 24-TVSOP packaging influence PCB layout decisions when integrating the PCA9555DGVR?
The 24-pin TVSOP package measures 4.4 mm wide with a small body height, enabling compact routing in space-constrained boards. However, its narrow lead pitch (~0.65 mm) demands careful attention to trace spacing and via placement to maintain signal integrity, especially near fast edges during I2C transitions. Thermal vias beneath the exposed pad enhance heat dissipation but must not create unintended current paths. Avoid placing sensitive analog traces adjacent to the interrupt or clock lines to minimize crosstalk.
Can multiple PCA9555DGVR devices share the same I2C bus simultaneously?
Yes, multiple PCA9555DGVRs can coexist on one I2C bus provided each has a unique I²C address. The device uses 4 address-select pins (A0–A3), offering up to 16 distinct addresses, which accommodates up to 16 expanders without conflict. Ensure pull-up resistors match bus capacitance and rise times for stable communication at 400 kHz; excessive loading may cause arbitration failures or missed interrupts.
What precautions should be taken when cascading PCA9555DGVRs in multi-stage expansion architectures?
When daisy-chaining PCA9555DGVRs, ensure that interrupt signals do not create race conditions—use open-drain configuration with proper pull-ups and consider masking unused interrupts. Also, verify that total bus capacitance remains within I2C specs (typically < 400 pF for 400 kHz operation). Longer cable runs benefit from series termination resistors near the master to suppress ringing, particularly if multiple devices are located far from the host processor.
How does the PCA9555DGVR handle undefined input states during initial power-up or brownout events?
Upon power-up, all GPIOs default to input mode until explicitly configured as outputs via software writes. During brownout or reset events, the POR circuit ensures registers return to their default state, preventing spurious interrupts. However, floating inputs may temporarily trigger interrupts due to noise pickup; applying weak pull-up/down resistors or configuring unused pins as outputs minimizes false triggering in noisy environments.
What role does the base product number PCA9555 play in firmware portability when substituting parts?
Devices sharing the PCA9555 base number typically implement identical functionality and register maps, facilitating firmware reuse across variants like the DGVR. Substituting TCA9555DBR or similar derivatives usually requires no code changes, though differences in pin count, package, or minor feature sets may necessitate conditional compilation flags. Always validate timing and electrical characteristics under actual operating conditions before final deployment.
Why might someone choose the PCA9555DGVR over a GPIO expander with higher clock frequency support?
Although the PCA9555DGVR operates at 400 kHz (Fast Mode), most I2C peripherals do not require faster speeds. Its primary advantage lies in deterministic interrupt response and proven SMBus compliance, not peak bandwidth. In contrast, 1 MHz devices often introduce jitter or require tighter tolerances on pull-up values, complicating layout. Unless your application involves very large data blocks or tight real-time constraints, the 400 kHz limit is sufficient and more forgiving in production environments.
Are there known issues with simultaneous read/write operations involving the PCA9555DGVR’s internal registers?
Concurrent access to different registers within the PCA9555DGVR is safe, but overlapping operations on the same register—such as writing while a read is pending—can yield unpredictable results. Always complete register transactions atomically in software, especially in interrupt-driven contexts. For example, avoid modifying the configuration register while an input change interrupt is being serviced, as this may corrupt the interrupt status register and mask subsequent events.
How does Moisture Sensitivity Level (MSL) = 1 affect storage and assembly handling of PCA9555DGVR components?
With MSL = 1, the PCA9555DGVR is not susceptible to moisture-induced defects and can be stored indefinitely at ambient conditions without baking prior to reflow. This simplifies inventory management and reduces processing steps in high-volume manufacturing, lowering cost and cycle time. Nevertheless, standard ESD precautions still apply during handling, and operators should use grounded workstations to prevent electrostatic discharge damage.
Can the PCA9555DGVR be used in battery-powered devices without compromising low-power performance?
The PCA9555DGVR consumes approximately 1 µA in standby mode when all outputs are high-impedance and inputs are idle, making it suitable for sleep-mode operation. However, frequent I2C polling increases average current significantly. To optimize power, leverage the interrupt function to wake the MCU only on meaningful events rather than querying status continuously. Disable unused interrupts and configure outputs appropriately before entering low-power states.
What testing strategy ensures reliable interrupt generation in the PCA9555DGVR during mass production?
Validate interrupt behavior by simulating input transitions while monitoring the INT pin with an oscilloscope or logic analyzer. Confirm that glitches shorter than the internal debounce filter (typ. 20 µs) do not trigger false positives. Perform statistical sampling across temperature extremes (-40°C and +85°C) to verify hysteresis margins. Automated test scripts should check both assertion and deassertion timing to catch asymmetric response issues early in the qualification phase.
Does the absence of a watchdog timer in the PCA9555DGVR necessitate external supervision in mission-critical systems?
The PCA9555DGVR lacks a hardware watchdog, so software-based monitoring or an external supervisory IC is necessary if system recovery from I/O lockup is required. In safety-relevant applications, pair the expander with a dedicated monitor that resets the MCU on timeout. Alternatively, design redundancy into critical paths using dual expanders with cross-checking logic to detect and report faults without relying solely on periodic heartbeats.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments PCA9555DGVR

Product Attribute PCA9555DBQR PCA9555DBR PCA9555DWRG4 PCA9555DWG4
Part Number PCA9555DBQR PCA9555DBR PCA9555DWRG4 PCA9555DWG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Luminary Micro / Texas Instruments
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current - Output Source/Sink - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Interface - - - -
Number of I/O - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Interrupt Output - - - -
Clock Frequency - - - -
Voltage - Supply - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -
Features - - - Simultaneous Sampling
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)

PCA9555DGVR Datasheet PDF

Download PCA9555DGVR pdf datasheets and Texas Instruments documentation for PCA9555DGVR - Texas Instruments.

PCN Design/Specification
Datasheet Update 25/Jun/2014.pdf PCA9555 04/Sep/2018.pdf
HTML Datasheet
PCA9555.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
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PCA9555DGVR Image

PCA9555DGVR

Texas Instruments
98D-PCA9555DGVR

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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