PCF8574T/3,512

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PCF8574T/3,512 is an integrated circuit (IC) used in a variety of applications in the field of interface - I/O Expanders. This IC is mainly used for expanding the inputs/outputs of a microcontroller or microprocessor system, but can be also utilized in other applications where it is necessary to expand the amount of available electrical inputs/outputs. For example, this IC can be used in signal conditioning circuits, as a direct port expansion, or simply, as a general-purpose signal interface.

The PCF8574T/3,512 integrated circuit is based on a simple 8-bit latch with a parallel-to-serial and serial-to-parallel data capability, meaning that it can work with either single bits or with byte-wide data. Its primary purpose is to expand the available pins of a microcontroller or similar electronic device, thereby allowing the user to have multiple inputs/outputs. This type of IC is ideal for applications where more input/output ports are required than are available on the microcontroller itself. Further, the PCF8574T/3,512 has its own power supply, so it can continue to operate while the microcontroller is powered down; this makes it a convenient tool when using a microcontroller in low-power mode.

In terms of its electrical characteristics, the PCF8574T/3,512 is powered from a +5.0V DC system. It has an operating temperature range of 0°C to 70°C and a minimum supply current of 60mA. The device itself features an 8-bit parallel bus interface, with a single command line and an 8-bit data line. The read/write operation can be initiated either by the falling edge of the command line or by a high-to-low transition of the address line. The device’s maximum data rate is 200 kHz, and it has a power down mode with a standby current of 15 uA at VDD=5V.

The PCF8574T/3,512 uses a pin-driven approach with multiple pins associated with individual functions such as inputs, outputs, input/output enables, read and write enables. The pins of this device are organized into 8 bit I/O ports, with a single pin being used as a read/write enable to make sure that the device only reads or writes data. The PCF8574T/3,512 also has an internal data latch which is used for storing output data. This data latch can be read in or out at any time, allowing the user to easily take advantage of the device’s input/output capabilities.

The PCF8574T/3,512 is a powerful IC for expanding the previously limited amount of available inputs/outputs. It offers a convenient way for system designers to gain access to a larger number of ports in a very small package. With its low cost and versatile design, it is a suitable choice for applications such as remote switch signaling, motor control, and signal conditioning.

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