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NXP Semiconductors PCA8574TS,112
- Part No.:
- PCA8574TS,112
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA8574TS,112.pdf
- Description:
- IC XPNDR 400KHZ I2C 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
PCA8574TS,112 from NXP Semiconductors is an 8-bit quasi-bidirectional I/O expander for I²C-bus (SCL/SDA), operating from 2.3 V to 5.5 V with 400 kHz Fast-mode support, 25 mA per-pin sink capability, and active-low open-drain interrupt output (INT). It enables remote GPIO expansion in space-constrained industrial control and LED display systems.
For engineers reviewing the PCA8574TS,112 datasheet, PCA8574TS,112 pinout, PCA8574TS,112 application, or PCA8574TS,112 equivalent, this device delivers low-standby-current I/O extension with hardware-addressable slave addressing (A0–A2), power-on reset initialization, and direct LED drive without external drivers.
Technical Context
The PCA8574TS,112 implements a single-register quasi-bidirectional I/O architecture where each of eight ports (P0–P7) functions as input or output without direction register overhead. Input states are monitored via weak 100 µA internal pull-ups; outputs drive LOW with 25 mA sink strength and HIGH via accelerated ½-clock-cycle pull-up followed by sustained 100 µA current source.
Its interrupt logic asserts INT (active LOW, open-drain) on any input state change versus register value, enabling event-driven microcontroller wake-up. The device uses a fixed 7-bit slave address prefix (0x40–0x47 for PCA8574 variant) with three hardware-selectable address bits (A0–A2), supporting up to eight units per I²C bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Bus Speed | 400 kHz Fast-mode - supports higher throughput than legacy 100 kHz PCF8574, reducing bus polling latency. |
| Supply Voltage Range | 2.3 V to 5.5 V - compatible with 3.3 V and 5 V systems; I/Os tolerant to 5.5 V when held to VDD. |
| Quasi-Bidirectional I/Os | 8 pins (P0–P7) - default to inputs at power-on with 100 µA pull-up; no direction register required. |
| Output Sink Current | 25 mA per pin - sufficient to directly drive standard LEDs without external transistors. |
| Total Package Sink | 200 mA - limits concurrent active outputs; enables high-current load sharing across multiple pins. |
| Interrupt Output | Active LOW open-drain (INT) - signals input state changes to MCU without continuous polling. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and embedded environments. |
Pinout & Package
PCA8574TS,112 is housed in a 20-lead SSOP package (SOT266-1), 4.4 mm body width, with 4 not-connected (n.c.) pins (pins 3, 8, 13, 18) and dedicated interrupt, clock, data, supply, and address terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (Pin 1) | Interrupt output | Active LOW open-drain signal indicating I/O state change; requires external pull-up to VDD. |
| P7–P0 (Pins 2, 19–20, 10–12, 16–17) | Quasi-bidirectional I/O | Each pin operates as input (weak 100 µA pull-up) or output (25 mA sink); no direction register needed. |
| SCL (Pin 2) | I²C serial clock | Master-generated clock line; synchronizes data transfer on SDA; requires external pull-up. |
| SDA (Pin 4) | I²C serial data | Bidirectional data line shared across I²C devices; requires external pull-up. |
| VDD (Pin 5) | Supply voltage | 2.3 V–5.5 V main power rail; powers internal logic and I/O pull-ups. |
| VSS (Pin 15) | Ground | Reference return path for all internal circuitry and I/O sinks. |
| A0–A2 (Pins 6, 7, 9) | Slave address inputs | Hardware-configurable bits selecting one of eight I²C addresses (0x40–0x47); must be externally biased. |
Key Features
| Feature | Design Value |
|---|---|
| Single-register I/O control | Eliminates direction register overhead-each port auto-adapts as input or output based on write value (1 = input/high-Z, 0 = output LOW). |
| Power-on reset (POR) | Automatically initializes all I/Os as inputs with 100 µA pull-up, ensuring safe default state without firmware initialization. |
| Event-driven interrupt | INT asserts on any input transition vs. register value-enables low-power MCU sleep between events instead of polling. |
| High-current LED drive | 25 mA sink per pin supports direct connection of standard LEDs with only series resistors-no external drivers required. |
| Multi-device I²C scalability | Three address pins (A0–A2) allow eight PCA8574TS,112 units on one bus; combined with PCA8574A, up to 16 expanders (128 I/Os). |
Applications
| LED Signs and Displays | Industrial Control Panels |
|---|---|
|
Use Scenario: Driving 8-segment displays, status indicators, and backlit panels in compact enclosures. IC Role / Device Role / Timing Role: Remote parallel I/O expander translating I²C commands into direct LED current control. Use Value: Eliminates need for discrete transistors or shift registers-reduces BOM count and PCB area while maintaining 25 mA per segment drive. |
Use Scenario: Monitoring pushbuttons, limit switches, and relay statuses while controlling solenoids and indicator lamps. IC Role / Device Role / Timing Role: Quasi-bidirectional GPIO hub with interrupt-driven input monitoring and latched output control. Use Value: Reduces MCU GPIO usage and polling overhead; INT pin enables immediate response to operator input or sensor events. |
| Medical Equipment Interfaces | PLC I/O Expansion Modules |
|
Use Scenario: Managing front-panel controls, alarm indicators, and sensor readouts in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power I/O extender with −40 °C to +85 °C operation and ESD-hardened I/Os (2000 V HBM). Use Value: Meets medical-grade reliability requirements with latch-up immunity (>100 mA) and stable 4.5 µA standby current for battery-backed operation. |
Use Scenario: Adding isolated digital I/O points to modular PLC base units using standardized I²C backplane communication. IC Role / Device Role / Timing Role: Addressable slave device supporting up to eight units per bus for scalable I/O node expansion. Use Value: Enables flexible I/O configuration without redesigning controller firmware-address pins allow field-replaceable module variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C-based remote I/O expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8574TS/3 | Legacy 100 kHz I²C interface; 80 mA total package sink; no 25 mA per-pin guarantee. | Limited to lower-speed buses and lighter loads; lacks PCA8574TS,112's Fast-mode timing and robust sink capability. | Select PCF8574TS/3 only for backward compatibility in existing 100 kHz designs with minimal I/O loading. |
| PCA8574ATS,112 | Different fixed I²C address prefix (0x70–0x77 vs. 0x40–0x47); identical pinout, electrical specs, and functionality. | Enables coexistence with PCA8574TS,112 on same I²C bus-doubles available node count without address conflict. | Choose PCA8574ATS,112 when expanding beyond eight expanders on one bus or requiring mixed PCA8574/PCA8574A topology. |
Compared with PCF8574TS/3, PCA8574TS,112 delivers 4× faster I²C throughput and 2.5× higher per-pin drive; versus PCA8574ATS,112, it shares identical performance but occupies a separate I²C address space-enabling scalable multi-expander systems without software reconfiguration.
Availability
PCA8574TS,112 is available at Aetrix Electronics and suitable for industrial control panels, LED signage systems, and medical equipment interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA8574TS,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 core expertise in interface, power management, and microcontroller technologies.
The PCA8574 family was designed specifically to simplify I²C-based GPIO expansion in resource-constrained embedded systems-delivering low-power, interrupt-aware remote I/O with minimal firmware overhead.
FAQ
What is the I²C address range supported by PCA8574TS,112?
The PCA8574TS,112 uses the PCA8574 variant address scheme with a fixed 7-bit prefix of 0x40. With hardware address pins A0–A2, it supports eight slave addresses: 0x40–0x47 (write) / 0x41–0x4F (read). This differs from PCA8574A (0x70–0x77), enabling dual-family bus coexistence. PCA8574TS,112 does not support dynamic address programming.
How does the quasi-bidirectional I/O architecture of PCA8574TS,112 differ from standard push-pull GPIO?
PCA8574TS,112 eliminates direction registers: writing '1' configures a pin as input (with 100 µA pull-up), writing '0' activates a strong 25 mA sink. This simplifies firmware, reduces memory footprint, and avoids bus contention during mode switching. Unlike push-pull outputs, it cannot actively drive HIGH-only sink LOW or weakly pull HIGH via current source.
Can PCA8574TS,112 directly drive LEDs without external components?
Yes-PCA8574TS,112 provides 25 mA sink current per I/O pin at 4.5 V, sufficient to drive standard 20 mA LEDs with only a series current-limiting resistor. Its 200 mA total package sink limit allows concurrent activation of up to eight LEDs, provided individual pin currents stay within 25 mA and thermal limits are observed.
What happens to the I/O pins during power-on reset of PCA8574TS,112?
Upon power application, PCA8574TS,112's internal Power-On Reset (POR) circuit initializes all eight I/O pins (P0–P7) as inputs with a 100 µA weak pull-up to VDD. This ensures a known high-impedance, fail-safe state before firmware intervention-critical for preventing unintended actuation in safety-sensitive systems.
Is PCA8574TS,112 pin-compatible with other packages in the PCA8574 family?
No-PCA8574TS,112 uses a 20-pin SSOP (SOT266-1) package with distinct pinout (e.g., INT on Pin 1, n.c. on Pins 3/8/13/18). It is not pin-compatible with SO16 (PCA8574D) or TSSOP16 (PCA8574PW) variants, which use 16-pin layouts and different pin assignments for A0–A2, P0–P7, and INT. Board redesign is required for package substitution.
PCA8574TS,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 8
- Interface:
- I2C
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 100µA, 25mA
- 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:
- 20-SSOP
PCA8574TS,112 FAQ
1.How can I place an order for PCA8574TS,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA8574TS,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 PCA8574TS,112 reliable?
The price and inventory of PCA8574TS,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8574TS,112 is usually 5 days.
3.What payment methods are accepted for PCA8574TS,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8574TS,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA8574TS,112?
PCA8574TS,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA8574TS,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 PCA8574TS,112?
For technical support, including PCA8574TS,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8574TS,112 requirements.
6.How does Aetrix verify that PCA8574TS,112 is sourced from the original manufacturer or authorized distributors?
All PCA8574TS,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 PCA8574TS,112 meets industry standards.
7.What is the process for return or replacement of PCA8574TS,112?
All PCA8574TS,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA8574TS,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 PCA8574TS,112 part is unused and in its original packaging.
Return procedure for PCA8574TS,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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