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PCF8574
Datasheet
General description
The PCF8574 is a silicon CMOS circuit. It provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C-bus).
The device consists of an 8-bit quasi-bidirectional port and an I2C-bus interface. The PCF8574 has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs. It also possesses an interrupt line (INT) which can be connected to the interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C-bus. This means that the PCF8574 can remain a simple slave device.
The PCF8574 and PCF8574A versions differ only in their slave address as shown in Fig.10.
Features
- Operating supply voltage 2.5 to 6 V
- Low standby current consumption of 10 uA maximum
- I2C-bus to parallel port expander
- Open-drain interrupt output
- 8-bit remote I/O port for the I2C-bus
- Compatible with most microcontrollers
- Latched outputs with high current drive capability for directly driving LEDs
- Address by 3 hardware address pins for use of up to 8 devices (up to 16 with PCF8574A)
- DIP16, or space-saving SO16 or SSOP20 packages.
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCF8574AP | PCF8574APN | 9338 516 70112 | Volume production | SOT38-4
(DIP16) | Bulk Pack | Standard Marking | PCF8574AP
| Always Pb-free |
| PCF8574AT/3 | PCF8574ATD | 9352 755 81512 | Volume production | SOT162-1
(SO16) | Tube Dry Pack | Standard Marking | PCF8574AT/3
| week 35, 2004 |
| PCF8574AT/3 | PCF8574ATD-T | 9352 755 81518 | Volume production | SOT162-1
(SO16) | Reel Dry Pack, SMD, 13" | Standard Marking | PCF8574AT/3
| week 35, 2004 |
| PCF8574ATS/3 | PCF8574ATDK-T | 9352 765 44118 | Volume production | SOT266-1
(SSOP20) | Reel Pack, SMD, 13" | Standard Marking | PCF8574ATS/3
| Always Pb-free |
| PCF8574P | PCF8574PN | 9337 060 60112 | Volume production | SOT38-4
(DIP16) | Bulk Pack | Standard Marking | PCF8574P
| Always Pb-free |
| PCF8574T/3 | PCF8574TD | 9352 756 17512 | Volume production | SOT162-1
(SO16) | Tube Dry Pack | Standard Marking | PCF8574T/3
| Always Pb-free |
| PCF8574T/3 | PCF8574TD-T | 9352 756 17518 | Volume production | SOT162-1
(SO16) | Reel Dry Pack, SMD, 13" | Standard Marking | PCF8574T/3
| Always Pb-free |
| PCF8574TS/3 | PCF8574TDK-T | 9352 756 72118 | Volume production | SOT266-1
(SSOP20) | Reel Pack, SMD, 13" | Standard Marking | PCF8574TS/3
| Always Pb-free |
| PCF8574TS/3 | PCF8574TDK | 9352 756 72112 | Volume production | SOT266-1
(SSOP20) | Tube | Standard Marking | PCF8574TS/3
| Always Pb-free |
Products in the above table are all in production. Some variants are discontinued; click here for information on these variants.
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| PCF8574AP | 9338 516 70112 | 2.1300 | Order samples | |||||
| PCF8574AT/3 | 9352 755 81512 | 2.0400 | not available | |||||
| PCF8574AT/3 | 9352 755 81518 | 2.0400 | Order samples | |||||
| PCF8574ATS/3 | 9352 765 44118 | 1.3900 | Order samples | |||||
| PCF8574P | 9337 060 60112 | 2.1300 | Order samples | |||||
| PCF8574T/3 | 9352 756 17512 | 2.0400 | not available | |||||
| PCF8574T/3 | 9352 756 17518 | 2.0400 | Order samples | |||||
| PCF8574TS/3 | 9352 756 72118 | 2.1100 | Order samples | |||||
| PCF8574TS/3 | 9352 756 72112 | 2.1100 | not available |
Applications
Related applications
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PDA - discretes focus
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LCD TV - MMS functionality
Set-top box - MMS functionality
Technical documents
Application Notes
AN10216_1;
I2C manual (27-Mar-03)
AN10369_1;
UART/SPI/I2C code examples (12-Apr-05)
AN469_2;
I2C/SMBus general purpose I/O expanders (20-Jan-05)
Support Documents
75013239;
I 2 C Logic Selection Guide (2005-01-12)
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
75012744;
I2C Bus Solutions 2004 (2004-02-01)
philips_i2c_handbook;
I2C Handbook (2004-01-01)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
philips_i2c_logic_overview;
Interface Products Business Line Specialty Logic Product Line I2C Logic Family Overview (2004-01-01)
75007416;
LCD drivers linecard (2001-11-23)
75016020;
NXP 8/16-bit I2C/SMBus GPIO expanders PCA9534/35/35C for low-power applications (2007-06-01)
75009897;
PCA9500/PCA9501 (2002-06-01)
75010197;
PCA9534/9535 I/O Expanders (2002-08-01)
Parametrics/similar products
| Type number | Package | INTERRUPT | Operating temp.(Cel) | # of Bits | Source Current per bit(mA) | I²C-bus(kHz) | Operating voltage(VDC) | Weak Pull-Up Current Source | Max Sink Current per bit(mA) | # of Addresses | Max Sink Current per package(mA) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| PCF8574AP | SOT38-4
(DIP16) | 0-1 | -40~85 | 8 | 0.1 | 100 | 2.5~6.0 | yes | 20 | 4 | 100 |
| PCF8574AT/3 | SOT162-1
(SO16) | 0-1 | -40~85 | 8 | 0.1 | 100 | 2.5~6.0 | yes | 20 | 4 | 100 |
| PCF8574ATS/3 | SOT266-1
(SSOP20) | 0-1 | -40~85 | 8 | 0.1 | 100 | 2.5~6.0 | yes | 20 | 8 | 100 |
| PCF8574P | SOT38-4
(DIP16) | 0-1 | -40~85 | 8 | 0.1 | 100 | 2.5~6.0 | yes | 20 | 4 | 100 |
| PCF8574T/3 | SOT162-1
(SO16) | 0-1 | -40~85 | 8 | 0.1 | 100 | 2.5~6.0 | yes | 20 | 8 | 100 |
| PCF8574TS/3 | SOT266-1
(SSOP20) | 0-1 | -40~85 | 8 | 0.1 | 100 | 2.5~6.0 | yes | 20 | 8 | 100 |
Similar products
PCF8574 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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