Overview
The PCF8574APWRE4, produced by Texas Instruments, is an 8-bit input/output (I/O) expander designed for use with the two-line bidirectional I2C bus. This device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface, which includes serial clock (SCL) and serial data (SDA) lines. It operates within a supply voltage range of 2.5V to 6V, making it versatile for various applications. The PCF8574APWRE4 features an 8-bit quasi-bidirectional I/O port (P0–P7) with latched outputs, capable of directly driving LEDs with high-current drive capability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.5 to 6 | V |
| Input Voltage Range | -0.5 to VCC + 0.5 | V |
| Output Voltage Range | -0.5 to VCC + 0.5 | V |
| Standby Current Consumption | 10 μA (max) | A |
| Continuous Output Low Current | 50 mA | A |
| Continuous Output High Current | -4 mA | A |
| Operating Temperature Range | -40 to 85 | °C |
| I2C Bus Frequency | 100 kHz | Hz |
| Package Type | TSSOP (20 pins) | - |
| Package Size | 6.50 mm × 4.40 mm | mm |
Key Features
- Low standby-current consumption of 10 μA max
- I2C to parallel-port expander
- Open-drain interrupt output
- Compatible with most microcontrollers
- Latched outputs with high-current drive capability for directly driving LEDs
- Latch-up performance exceeds 100 mA Per JESD 78, Class II
- Quasi-bidirectional I/O ports (P0–P7) that can be used as inputs or outputs without a data-direction control signal
- Three hardware address inputs allowing up to 16 devices on the same I2C bus
Applications
- Telecom shelters: 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 operating voltage range of the PCF8574APWRE4?
The PCF8574APWRE4 operates within a supply voltage range of 2.5V to 6V.
- What is the maximum standby current consumption of the PCF8574APWRE4?
The maximum standby current consumption is 10 μA.
- What type of interface does the PCF8574APWRE4 use for communication?
The device uses the I2C (Inter-Integrated Circuit) interface for communication.
- How many quasi-bidirectional I/O ports does the PCF8574APWRE4 have?
The device features an 8-bit quasi-bidirectional I/O port (P0–P7).
- Can the PCF8574APWRE4 directly drive LEDs?
Yes, the latched outputs have high-current drive capability for directly driving LEDs.
- What is the purpose of the interrupt output on the PCF8574APWRE4?
The interrupt output is used to indicate to the microcontroller that an input state has changed, eliminating the need for continuous polling.
- How many devices of this type can be connected on the same I2C bus?
Up to 16 devices can be connected on the same I2C bus, allowing for up to 128 I/Os.
- What is the operating temperature range of the PCF8574APWRE4?
The device operates within a temperature range of -40°C to 85°C.
- What package types are available for the PCF8574APWRE4?
The device is available in several package types, including TSSOP, SOIC, PDIP, TVSOP, and VQFN.
- What is the I2C bus frequency supported by the PCF8574APWRE4?
The device supports an I2C bus frequency of up to 100 kHz.
