Overview
The PCF8574P,112, produced by NXP USA Inc., is a remote 8-bit I/O expander designed for use with the two-wire bidirectional I²C-bus. This component provides general-purpose remote I/O expansion, making it suitable for various applications requiring additional I/O ports. Although the PCF8574P,112 is currently obsolete and no longer manufactured, it remains an important component in understanding I/O expansion technology.
Key Specifications
| Specification | Value |
|---|---|
| Interface Type | I²C-bus (Standard-mode, 100 kHz) |
| Operating Supply Voltage | 2.5 V to 6 V |
| Number of I/O Ports | 8 quasi-bidirectional ports |
| Hardware Address Inputs | 3 (allowing up to 16 devices on the same I²C-bus) |
| Interrupt Output | Active LOW open-drain interrupt output |
| Standby Current | 2.5 µA (typical, static) |
| Operating Temperature Range | -40°C to +85°C |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
| Package Type | Through Hole (e.g., DIP-16) |
Key Features
- I²C-bus to parallel port expander
- 100 kHz I²C-bus interface (Standard-mode I²C-bus)
- 8-bit remote I/O pins that default to inputs at power-up
- Latched outputs directly drive LEDs
- Total package sink capability of 80 mA
- Eight programmable slave addresses using three address pins
- Low standby current (2.5 µA typical)
- Internal Power-On Reset (POR) initializes I/Os as inputs with a weak internal pull-up 100 µA current source
Applications
The PCF8574P,112 is suitable for various applications requiring remote I/O expansion, such as:
- Mobile devices due to its low current consumption
- Industrial control systems needing additional I/O ports
- Consumer electronics requiring simple and efficient I/O expansion
- Automotive systems where multiple I/Os are needed
Q & A
- What is the PCF8574P,112 used for?
The PCF8574P,112 is used for remote 8-bit I/O expansion via the I²C-bus.
- What is the operating supply voltage range of the PCF8574P,112?
The operating supply voltage range is 2.5 V to 6 V.
- How many I/O ports does the PCF8574P,112 have?
The device has 8 quasi-bidirectional I/O ports.
- What is the purpose of the interrupt output on the PCF8574P,112?
The interrupt output is an active LOW open-drain output that indicates to the microcontroller that an input state has changed.
- Can multiple PCF8574P,112 devices be connected on the same I²C-bus?
Yes, up to 16 devices can be connected on the same I²C-bus using the three hardware address inputs.
- What is the standby current of the PCF8574P,112?
The typical standby current is 2.5 µA.
- What is the operating temperature range of the PCF8574P,112?
The operating temperature range is -40°C to +85°C.
- Does the PCF8574P,112 have ESD protection?
Yes, it exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101.
- Is the PCF8574P,112 still in production?
No, the PCF8574P,112 is obsolete and no longer manufactured.
- What package types are available for the PCF8574P,112?
The device is available in through-hole packages such as DIP-16.
