Overview
The PCF8575DBR, produced by Texas Instruments, is a 16-bit I2C and SMBus I/O expander designed to provide general-purpose remote I/O expansion for most microcontroller families. This device operates within a voltage range of 2.5V to 5.5V and is compatible with the two-line bidirectional bus (I2C) interface. It features a quasi-bidirectional input/output (I/O) port, allowing each I/O to be used as either an input or output without the need for a data-direction control signal. The PCF8575DBR is particularly useful in applications where additional I/O ports are required, and it supports up to eight devices on the same bus using three hardware address pins.
Key Specifications
| Parameter | Specification |
|---|---|
| Operating Voltage Range | 2.5V to 5.5V |
| Number of I/O Ports | 16-bit (P07–P00, P17–P10) |
| I2C Bus Speed | 400 kHz |
| Standby Current Consumption | 10 μA maximum |
| Addressing Capability | Up to eight devices using three hardware address pins |
| Output Drive Capability | Latched outputs with high-current drive for directly driving LEDs |
| ESD Protection | Exceeds JESD 22: 2000V Human-body model, 200V Machine model, 1000V Charged-device model |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | SSOP (DB) with 24 pins |
Key Features
- I2C to parallel-port expander
- Open-drain interrupt output
- Low standby-current consumption of 10 μA maximum
- Compatible with most microcontrollers
- 400 kHz 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 100 mA 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 PCF8575DBR?
The operating voltage range is 2.5V to 5.5V. - How many I/O ports does the PCF8575DBR have?
The device has a 16-bit quasi-bidirectional input/output port (P07–P00, P17–P10). - What is the maximum standby current consumption of the PCF8575DBR?
The maximum standby current consumption is 10 μA. - Can the PCF8575DBR be used with multiple devices on the same I2C bus?
- What is the I2C bus speed of the PCF8575DBR?
The I2C bus speed is 400 kHz.- Does the PCF8575DBR have ESD protection?
- What is the operating temperature range of the PCF8575DBR?
The operating temperature range is -40°C to 85°C.- What type of package does the PCF8575DBR come in?
The device comes in an SSOP (DB) package with 24 pins.- Can the PCF8575DBR drive LEDs directly?
- Is the PCF8575DBR compatible with most microcontrollers?
- What is the I2C bus speed of the PCF8575DBR?
