Overview
The PCF8575DB, produced by Texas Instruments, is a 16-bit I/O expander designed for use with the two-line bidirectional I2C and SMBus. This device provides general-purpose remote I/O expansion for most microcontroller families. It operates within a voltage range of 2.5V to 5.5V and is compatible with a wide range of microcontrollers. The PCF8575DB features a quasi-bidirectional 16-bit input/output port, which can be used as either inputs or outputs without the need for a data-direction control signal. At power-on, all I/Os are set to logic high with a current source to VCC active.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage (VCC) | 2.5 to 5.5 | V |
| Standby Current Consumption | 10 | μA |
| I2C Bus Frequency | 400 | kHz |
| Number of I/O Ports | 16 | - |
| Package Types | SSOP, QSOP, TVSOP, SOIC, TSSOP, VQFN | - |
| Operating Temperature Range | -40 to 85 | °C |
| ESD Protection | 2000V Human-body model, 200V Machine model, 1000V Charged-device model | - |
Key Features
- I2C to parallel-port expander
- Open-drain interrupt output
- Low standby-current consumption of 10µA maximum
- Compatible with most microcontrollers
- 400kHz Fast I2C bus
- Address by three hardware address pins for use of up to eight devices
- Latched outputs with high-current drive capability for directly driving LEDs
- Current source to VCC for actively driving a high at the output
- Latch-up performance exceeds 100mA Per JESD 78, Class II
- ESD Protection exceeds JESD 22
Applications
- Telecom Shelters: Filter Units
- Servers
- Routers (Telecom Switching Equipment)
- Personal Computers
- Personal Electronics
- Industrial Automation
- Products with GPIO-Limited Processors
Q & A
- What is the operating voltage range of the PCF8575DB?
The PCF8575DB operates within a voltage range of 2.5V to 5.5V.
- What is the maximum standby current consumption of the PCF8575DB?
The maximum standby current consumption is 10µA.
- What is the frequency of the I2C bus supported by the PCF8575DB?
The PCF8575DB supports a 400kHz Fast I2C bus.
- How many I/O ports does the PCF8575DB have?
The PCF8575DB has 16 quasi-bidirectional I/O ports.
- What types of packages are available for the PCF8575DB?
The PCF8575DB is available in SSOP, QSOP, TVSOP, SOIC, TSSOP, and VQFN packages.
- What is the operating temperature range of the PCF8575DB?
The operating temperature range is -40°C to 85°C.
- What level of ESD protection does the PCF8575DB offer?
The PCF8575DB offers ESD protection exceeding JESD 22 standards: 2000V Human-body model, 200V Machine model, and 1000V Charged-device model.
- How does the PCF8575DB handle interrupt signals?
The PCF8575DB has an open-drain interrupt output that can inform the microcontroller of incoming data on its ports without needing to communicate via the I2C-bus.
- Can the PCF8575DB drive LEDs directly?
Yes, the PCF8575DB has latched outputs with high-current drive capability for directly driving LEDs.
- How many devices can be addressed using the PCF8575DB?
Up to eight devices can be addressed using the three hardware address pins.
