Overview
The PCF8574T/3,512 is an 8-bit remote I/O Expander designed for use with the I²C-bus interface. Produced by NXP USA Inc., this component provides general-purpose remote I/O expansion via a two-wire bidirectional I²C-bus, consisting of serial clock (SCL) and serial data (SDA) lines. It is particularly useful for expanding the I/O capabilities of microcontrollers without requiring additional pins. The device operates within a voltage range of 2.5V to 6.0V, making it adaptable to various power environments and suitable for battery-operated devices due to its low standby current consumption of 2.5μA (typical, static).
Key Specifications
| Parameter | Value |
|---|---|
| Number of I/O Ports | 8-bit |
| Interface | I²C-bus (100kHz standard-mode) |
| Supply Voltage | 2.5V to 6.0V |
| Package Type | 16-pin SOIC |
| Operating Temperature | -40°C to 85°C |
| Standby Current | 2.5μA (typical, static) |
| Output Current Source/Sink | 300μA / 25mA |
| Interrupt Output | Active low open-drain |
| ESD Protection | Exceeds 2,000V HBM and 1,000V CDM |
| Latch-up Testing | Exceeds 100mA (JEDEC standard JESD78) |
Key Features
- 8 quasi-bidirectional ports that can be independently assigned as inputs or outputs.
- Latched outputs that directly drive LEDs, with a total package sink capability of 80mA.
- Active low open-drain interrupt output for efficient interrupt handling.
- Low standby current consumption, making it suitable for battery-operated devices.
- Robust ESD protection exceeding 2,000V HBM and 1,000V CDM, and superior latch-up testing performance.
- Three hardware address inputs, allowing up to 8 expansion boards to connect to a single I²C-bus, managing up to 64 I/O ports.
Applications
- Embedded systems where additional I/O ports are necessary.
- Dynamic electronic projects requiring I/O expansion.
- I²C LCD displays, extending the usable pins by leveraging the SDA and SCL pins.
- Battery-operated devices due to its low power consumption.
- Systems requiring high-speed communication and control, such as real-time data processing and management).
Q & A
- What is the PCF8574T/3,512 used for?
The PCF8574T/3,512 is used as an 8-bit remote I/O Expander for I²C-bus, providing general-purpose remote I/O expansion).
- What is the operating voltage range of the PCF8574T/3,512?
The operating voltage range is from 2.5V to 6.0V).
- What type of interface does the PCF8574T/3,512 use?
The device uses a 100kHz standard-mode I²C-bus interface).
- How many I/O ports does the PCF8574T/3,512 have?
The device has 8 quasi-bidirectional I/O ports).
- What is the standby current consumption of the PCF8574T/3,512?
The standby current consumption is 2.5μA (typical, static)).
- Does the PCF8574T/3,512 have ESD protection?
Yes, it exceeds 2,000V HBM and 1,000V CDM).
- What is the interrupt output type of the PCF8574T/3,512?
The interrupt output is active low open-drain).
- Can the PCF8574T/3,512 be used in battery-operated devices?
Yes, due to its low power consumption, it is highly suitable for battery-operated devices).
- How many expansion boards can connect to a single I²C-bus using the PCF8574T/3,512?
Up to 8 expansion boards can connect to a single I²C-bus, managing up to 64 I/O ports).
- What is the operating temperature range of the PCF8574T/3,512?
The operating temperature range is from -40°C to 85°C).
