PCF8574A Datasheet, PDF (1/16 Pages) Texas Instruments – REMOTE 8BIT I/O EXPANDER FOR I2C BUS

D Low Standby-Current Consumption of
10 µA Maximum
D I²C to Parallel-Port Expander
D Open-Drain Interrupt Output
D Compatible With Most Microcontrollers
PCF8574
REMOTE 8ĆBIT I/O EXPANDER FOR I²C BUS
SCPS068C - JULY 2001 − REVISED JANUARY 2004
D Latched Outputs With High-Current Drive
Capability for Directly Driving LEDs
D Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
DW OR N PACKAGE
(TOP VIEW)
RGY PACKAGE
(TOP VIEW)
DGV OR PW PACKAGE
(TOP VIEW)
A0 1
A1 2
A2 3
P0 4
P1 5
P2 6
P3 7
GND 8
16 V_CC
15 SDA
14 SCL
13 INT
12 P7
11 P6
10 P5
9 P4
1
SCL 2
NC 3
SDA 4
V_CC 5
A0 6
A1 7
NC 8
A2 9
10
20
19 P6
18 NC
17 P5
16 P4
15 GND
14 P3
13 NC
12 P2
11
NC − No internal connection
INT ¹
SCL ²
NC ³
SDA ⁴
V_CC ⁵
A0 ⁶
A1 ⁷
NC ⁸
A2 ⁹
P0 ¹⁰
20 P7
19 P6
18 _NC
17 _P5
16 _P4
15 _GND
14 _P3
13 _NC
12 _P2
11 _P1
NC − No internal connection
description/ordering information
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 PCF8574 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. An additional strong pullup to V_CC allows fast rising edges into heavily loaded outputs. This device
turns on when an output is written high and is switched off by the negative edge of SCL. The I/Os should be
high before being used as inputs.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QFN − RGY
PDIP − N
Tape and reel
Tube
PCF8574RGYR
PCF8574N
PF574
PCF8574N
−40°C to 85°C SOIC − DW
TSSOP − PW
Tube
Tape and reel
Tape and reel
PCF8574DW
PCF8574DWR
PCF8574PWR
PCF8574
PF574
TVSOP − DGV Tape and reel PCF8574DGVR PF574
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design}
guidelines are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright  2004, Texas Instruments Incorporated
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