PCF8574

Part: PCF8574; PCF8574A

Type: Remote 8-bit I/O expander for I2C-bus with interrupt

Description: The PCF8574/74A provides general-purpose remote 8-bit quasi-bidirectional I/O expansion via a 100 kHz I2C-bus, featuring three hardware address inputs, an active LOW interrupt output, and operating from 2.5 V to 6 V with a typical standby current of 2.5 μA.

Operating Conditions:

• Supply voltage: 2.5 V to 6 V
• Operating temperature: -40 °C to +85 °C
• I2C-bus frequency: 100 kHz

Absolute Maximum Ratings:

• Max supply voltage: null
• Max continuous current: 80 mA (total package sink capability)
• Max junction/storage temperature: null

Key Specs:

• I/O bits: 8 (quasi-bidirectional)
• I2C-bus interface: 100 kHz (Standard-mode)
• Supply voltage range: 2.5 V to 6 V
• Standby current: 2.5 μA (typical)
• I/O weak pull-up current: 100 μA
• Total package sink capability: 80 mA
• Operating temperature range: -40 °C to +85 °C
• Programmable slave addresses: 8 for PCF8574 (0x20-0x27), 8 for PCF8574A (0x38-0x3F)

Features:

• I2C-bus to parallel port expander
• 100 kHz I2C-bus interface (Standard-mode I2C-bus)
• Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to VDD with 100 μA current source
• 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
• Active LOW open-drain interrupt output
• Eight programmable slave addresses using three address pins
• Low standby current (2.5 μA typical)
• -40 °C to +85 °C operation
• ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA

Applications:

• LED signs and displays
• Servers
• Key pads
• Industrial control
• Medical equipment
• PLC
• Cellular telephones
• Mobile devices
• Gaming machines
• Instrumentation and test measurement

Package:

• DIP16 (16 leads (300 mil))
• SO16 (16 leads; body width 7.5 mm)
• SSOP20 (20 leads; body width 4.4 mm)

• I 2 C-bus to parallel port expander
• 100 kHz I 2 C-bus interface (Standard-mode I 2 C-bus)
• Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to VDD with 100 A current source
• 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
• Active LOW open-drain interrupt output
• Eight programmable slave addresses using three address pins
• Low standby current (2.5 A typical)
• 40 C to +85 C operation
• ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101

Product data sheet

• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
• Packages offered: DIP16, SO16, SSOP20

• LED signs and displays
• Servers
• Key pads
• Industrial control
• Medical equipment
• PLC
• Cellular telephones
• Mobile devices
• Gaming machines
• Instrumentation and test measurement

PCF8574 Pinout

Package: DIP16 / SO16

Notes

• Pinout extracted for DIP16/SO16 package variant of PCF8574.
• SSOP20 package variant exists with different pin assignments (see datasheet Table 3 for SSOP20 column).
• INT is an open-drain output; SCL and SDA are I²C bus lines (open-drain with pull-up resistors required).
• P0–P7 are quasi-bidirectional I/O pins with internal pull-up structure.
• A0, A1, A2 are address inputs used to select one of eight possible I²C slave addresses (0x20–0x27 for PCF8574).

DIP16: plastic dual in-line package; 16 leads (300 mil)

SOT38-4

DIMENSIONS (inch dimensions are derived from the original mm dimensions)