Overview
The PCA8574D,518 is a remote 8-bit I/O expander designed by NXP USA Inc. for use with the two-wire bidirectional I²C-bus. This device provides general-purpose remote I/O expansion, making it versatile for various applications. It features eight quasi-bidirectional ports, a 400 kHz I²C-bus interface, and three hardware address inputs, allowing multiple devices to be connected on the same bus. The PCA8574D,518 is particularly useful for expanding the I/O capabilities of microcontrollers and other integrated circuits.
Key Specifications
| Parameter | Value |
|---|---|
| Package / Case | 16-SOIC (0.295, 7.50mm Width) |
| Operating Temperature | -40°C to +85°C |
| Supply Voltage | 2.3V to 5.5V |
| Number of I/O | 8 |
| Interface | I²C |
| Clock Frequency | 400 kHz |
| Interrupt Output | Yes, Active LOW open-drain |
| Output Current | 25 mA sink capability |
| Standby Current | 4.5 μA (typical) |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
Key Features
- 8-bit remote I/O expander for I²C-bus with interrupt
- 400 kHz I²C-bus interface (Fast-mode I²C-bus)
- Operating supply voltage range from 2.3 V to 5.5 V with 5.5 V tolerant I/Os
- Eight quasi-bidirectional I/O pins that default to inputs at power-up
- Latched outputs with 25 mA sink capability for directly driving LEDs
- Active LOW open-drain interrupt output
- Eight programmable slave addresses using three address pins
- Low standby current (4.5 μA typical)
- Compliant with RoHS and Green Standards
Applications
- LED signs and displays
- Servers
- Key pads
- Industrial control
- Medical equipment
- PLCs (Programmable Logic Controllers)
- Cellular telephones
- Mobile devices
- Gaming machines
- Instrumentation and test measurement
Q & A
- What is the PCA8574D,518 used for?
The PCA8574D,518 is used for remote I/O expansion via the I²C-bus, allowing the expansion of I/O capabilities of microcontrollers and other integrated circuits.
- What is the operating voltage range of the PCA8574D,518?
The operating voltage range is from 2.3 V to 5.5 V.
- How many I/O pins does the PCA8574D,518 have?
The device has 8 quasi-bidirectional I/O pins.
- What is the clock frequency of the I²C-bus interface?
The clock frequency is up to 400 kHz.
- Does the PCA8574D,518 have an interrupt output?
Yes, it has an active LOW open-drain interrupt output.
- What is the standby current of the PCA8574D,518?
The standby current is 4.5 μA (typical).
- Can multiple PCA8574D,518 devices be connected on the same I²C-bus?
Yes, up to 16 devices can be connected on the same I²C-bus, supporting up to 128 I/Os.
- What is the ESD protection level of the PCA8574D,518?
It exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101.
- Is the PCA8574D,518 RoHS compliant?
Yes, it is compliant with RoHS and Green Standards.
- What are some common applications of the PCA8574D,518?
Common applications include LED signs and displays, servers, key pads, industrial control, medical equipment, and more.
