This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 6-V VCC operation.
The PCF8574 device provides general-purpose remote I/O expansion for most microcontroller families by way of the I2C interface [serial clock (SCL), serial data (SDA)].
The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.
| Number of I/Os | 8 |
| Features | Interrupt pin |
| Supply voltage (min) (V) | 2.5 |
| Supply voltage (max) (V) | 6 |
| Addresses | 8 |
| Rating | Catalog |
| Frequency (max) (MHz) | 0.1 |
| Operating temperature range (°C) | -40 to 85 |
| PDIP (N) | 16 | 181.42 mm² 19.3 x 9.4 |
| SOIC (DW) | 16 | 106.09 mm² 10.3 x 10.3 |
| TSSOP (PW) | 20 | 41.6 mm² 6.5 x 6.4 |
| VQFN (RGT) | 16 | 9 mm² 3 x 3 |
| VQFN (RGY) | 20 | 15.75 mm² 4.5 x 3.5 |
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