PCF8574A_15 Datasheet, PDF (1/35 Pages) Texas Instruments – Remote 8-Bit I/O Expander

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PCF8574A
SCPS069F – JULY 2001 – REVISED NOVEMBER 2015
PCF8574A Remote 8-Bit I/O Expander for I²C Bus
1 Features
• Low Standby-Current Consumption of 10 μA Max
• I²C to Parallel-Port Expander
• Open-Drain Interrupt Output
• Compatible With Most Microcontrollers
• Latched Outputs With High-Current Drive
Capability for Directly Driving LEDs
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
2 Applications
• Telecom Shelters: Filter Units
• Servers
• Routers (Telecom Switching Equipment)
• Personal Computers
• Personal Electronics
• Industrial Automation
• Products with GPIO-Limited Processors
1
3 Description
This 8-bit input/output (I/O) expander for the two-line
bidirectional bus (I²C) is designed for 2.5-V to 6-V
V_CC operation.
The PCF8574A device provides general-purpose
remote I/O expansion for most microcontroller
families via 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 V_CC is active.
Device Information⁽¹⁾
PART NUMBER
PACKAGE (PIN)
BODY SIZE (NOM)
VQFN (20)
4.50 mm × 3.50 mm
PDIP (16)
19.30 mm × 6.35 mm
PCF8574A
SOIC (16)
10.30 mm × 7.50 mm
TSSOP (20)
6.50 mm × 4.40 mm
TVSOP (20)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
I2C or SMBus Master
(e.g. Processor)
VCC
SDA
SCL
P0
INT
P1
P2
PCF8574A
P3
P4
A0
P5
A1
P6
A2
P7
GND
Peripheral Devices
RESET, ENABLE,
or control inputs
INT or status
outputs
LEDs
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.