Overview
The PCF8574APW is an 8-bit input/output (I/O) expander designed for use with the two-line bidirectional I2C bus. Manufactured by Texas Instruments, this device is part of the PCF8574 family and is intended for general-purpose remote I/O expansion in various microcontroller-based systems. It operates over a supply voltage range of 2.5V to 6V, making it versatile for different application environments. The device features an 8-bit quasi-bidirectional I/O port (P0–P7) with latched outputs, capable of driving LEDs directly due to their high-current drive capability.
Key Specifications
| Parameter | Description |
|---|---|
| Part Number | PCF8574APW |
| Manufacturer | Texas Instruments |
| Package | 20-TSSOP (0.173, 4.40mm Width) |
| Number of Pins | 20 |
| Interface | I2C, SMBus |
| Supply Voltage | 2.5V to 6V |
| Technology | CMOS |
| Number of Ports | 1 (8-bit quasi-bidirectional I/O port) |
| Output Type | Push-Pull |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Terminal Pitch | 0.65 mm |
| RoHS Status | ROHS3 Compliant |
| Lead Free | Yes |
Key Features
- Low standby-current consumption of 10 μA max.
- I2C to parallel-port expander, compatible with most microcontrollers.
- Open-drain interrupt output.
- Latched outputs with high-current drive capability for directly driving LEDs.
- Quasi-bidirectional I/O ports (P0–P7) that can be used as inputs or outputs without a data-direction control signal.
- Power-on reset feature with I/Os set to high at power-on.
Applications
- Telecom shelters and filter units.
- Servers and routers (telecom switching equipment).
- Personal computers and personal electronics.
- Industrial automation.
- Products with GPIO-limited processors.
Q & A
- What is the PCF8574APW used for?
The PCF8574APW is used for general-purpose remote I/O expansion in microcontroller-based systems via the I2C bus.
- What is the operating voltage range of the PCF8574APW?
The device operates over a supply voltage range of 2.5V to 6V.
- What type of output does the PCF8574APW provide?
The PCF8574APW provides push-pull outputs.
- Is the PCF8574APW RoHS compliant?
- What is the package type of the PCF8574APW?
The PCF8574APW comes in a 20-TSSOP package.
- Can the PCF8574APW drive LEDs directly?
- What is the moisture sensitivity level (MSL) of the PCF8574APW?
The MSL of the PCF8574APW is 1 (Unlimited).
- What are some common applications of the PCF8574APW?
- Does the PCF8574APW have an interrupt output?
- What is the standby current consumption of the PCF8574APW?
