PCF8574TS/3,118

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PCF8574TS/3,118

IC I/O EXPANDER I2C 8B 20SSOP

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規格

Supplier NXP USA Inc.
Package Tape & Reel (TR),Cut Tape (CT)
ProductStatus Active
NumberofI/O 8
Interface I²C
InterruptOutput Yes
Features POR
OutputType Push-Pull
Current-OutputSource/Sink 300µA, 25mA
ClockFrequency 100 kHz
Voltage-Supply 2.5V ~ 6V
OperatingTemperature -40°C ~ 85°C
MountingType Surface Mount
Package/Case 20-LSSOP (0.173, 4.40mm Width)

概述

Description

The PCF8574TS/3,118 is an 8‑bit I2C I/O expander from the PCF8574 family. It lets you extend a microcontroller’s I/O over the I2C bus.
Key points
- 8 quasi‑bidirectional I/O pins (P0–P7) that can be used as inputs or outputs.
- I2C interface with A0–A2 address pins to select the device address (up to 8 devices on one bus).
- Supply voltage typically 2.5–6 V; low power.
- Operation: write a byte to set outputs; a 0 drives the pin low, a 1 releases it high via an internal pull‑up.
- Readback returns the current port states.
- Optional interrupt output (INT) signals changes on input pins.
- TS in the part number mainly denotes a specific package/ordering variant; check the datasheet for exact package, pinout, and voltage details.
Common uses: expand MCU digital I/O for LEDs, switches, sensors, or simple interface tasks. Pros: simple, cheap, no extra circuitry. Cons: no native analog I/O or high-speed operation.

Package

PCF8574TS/3,118 is the 16‑pin surface‑mount version, i.e., a TSSOP/SSOP‑style SMD package.

Pinout

- Pin count: 16 pins (DIP/SO/TSSOP-16 variants)
- Function: I2C 8-bit I/O expander. Provides 8 quasi-bidirectional I/O pins (P0–P7); interface via SDA/SCL; address selectable with A0–A2; used to expand microcontroller I/O.

Manufacturer

- Manufacturer: NXP Semiconductors (formerly Philips Semiconductors).
- What kind of company: Dutch multinational that designs and manufactures semiconductor devices and ICs (global supplier of integrated circuits and electronic components).

Application

PCF8574TS is an 8-bit I2C I/O expander. Common applications:
- Expand MCU GPIO via I2C when pins are limited
- Drive indicators (LEDs, LED matrices) and LCD backlights
- Read keyboards, pushbuttons and simple sensors
- Interface with relays/optocouplers via external drivers
- Control low-current loads and simple actuators
- I/O for home automation, consumer appliances and industrial equipment
- Port-expansion for compact control panels and remote I/O nodes

Equivalent

Equivalent devices (8-bit I2C I/O expanders to PCF8574):
- Microchip MCP23008
- NXP PCA8574 / PCA8574A
- NXP PCA9534 / PCA9534A
- TI TCA9534 / TCA9534A
For higher capacity: Microchip MCP23017 (16-bit).

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