Texas Instruments PCF8574APWR I²C I/O expander, 8-bit, 100 kHz, 2.5 V to 6 V supply, push-pull output, interrupt output, -40°C to 85°C, 20-TSSOP package.
| Parameter | Value |
|---|---|
| Output type | Push-Pull |
| Mounting | Surface Mount |
| Supply voltage | 2.5V ~ 6V |
| Current - output source (Sink) | 1mA, 25mA |
| Clock frequency | 100 kHz |
| Interface | I²C |
| Operating temperature | -40°C~85°C |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Features | POR |
| Number of i (O) | 8 |
| Case | 20-TSSOP (0.173\", 4.40mm Width) |
| Interrupt output | Yes |
The interrupt output (INT) signals the host when an input changes, eliminating the need for constant polling.
The push-pull output structure means no external pull-up resistors on output lines, though the I²C bus lines themselves still need pull-ups per the I²C specification.
No. The PCF8574APWR is the A-variant of the base PCF8574, with a different I²C slave address range (0x38–0x3F vs 0x20–0x27 for the original). The pinout and function are otherwise identical, but the address difference matters if you are replacing a PCF8574 on an existing bus.
Yes, the interrupt output (INT) is provided. It goes active low when any input changes state, allowing the host MCU to wake from sleep or trigger an interrupt service routine without polling the I²C bus.
Yes. The supply range of 2.5 V to 6 V covers 3.3 V operation, and the I²C interface is compatible with 3.3 V logic levels. No level translation is required.