The PCA8574/74A provide general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).
The devices consist of an 8-bit quasi-bidirectional port and an I2C-bus interface. The PCA8574/74A have low current consumption and include latched outputs with 25 mA high current drive capability for directly driving LEDs.
The PCA8574/74A also possess an interrupt line (INT) that 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.
The internal Power-On Reset (POR) initializes the I/Os as inputs.
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCA8574AD | PCA8574AD | 9352 834 89512 | Volume production | SOT162-1
(SO16) | Tube Dry Pack | Standard Marking | PCA8574AD
| Always Pb-free |
| PCA8574AD | PCA8574AD-T | 9352 834 89518 | Volume production | SOT162-1
(SO16) | Reel Dry Pack, SMD, 13" | Standard Marking | PCA8574AD
| Always Pb-free |
| PCA8574AN | PCA8574AN | 9352 834 92112 | Volume production | SOT38-4
(DIP16) | Tube | Standard Marking | PCA8574AN
| Always Pb-free |
| PCA8574APW | PCA8574APW | 9352 837 59112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | PCA8574APW
| Always Pb-free |
| PCA8574APW | PCA8574APW-T | 9352 837 59118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | PCA8574APW
| Always Pb-free |
| PCA8574ATS | PCA8574ATS | 9352 834 91112 | Volume production | SOT266-1
(SSOP20) | Tube | Standard Marking | PCA8574ATS
| Always Pb-free |
| PCA8574ATS | PCA8574ATS-T | 9352 834 91118 | Volume production | SOT266-1
(SSOP20) | Reel Pack, SMD, 13" | Standard Marking | PCA8574ATS
| Always Pb-free |
| PCA8574D | PCA8574D | 9352 834 85512 | Volume production | SOT162-1
(SO16) | Tube Dry Pack | Standard Marking | PCA8574D
| Always Pb-free |
| PCA8574D | PCA8574D-T | 9352 834 85518 | Volume production | SOT162-1
(SO16) | Reel Dry Pack, SMD, 13" | Standard Marking | PCA8574D
| Always Pb-free |
| PCA8574N | PCA8574N | 9352 834 86112 | Volume production | SOT38-4
(DIP16) | Tube | Standard Marking | PCA8574N
| Always Pb-free |
| PCA8574PW | PCA8574PW | 9352 837 61112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | PCA8574PW
| Always Pb-free |
| PCA8574PW | PCA8574PW-T | 9352 837 61118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | PCA8574PW
| Always Pb-free |
| PCA8574TS | PCA8574TS | 9352 834 87112 | Volume production | SOT266-1
(SSOP20) | Tube | Standard Marking | PCA8574TS
| Always Pb-free |
| PCA8574TS | PCA8574TS-T | 9352 834 87118 | Volume production | SOT266-1
(SSOP20) | Reel Pack, SMD, 13" | Standard Marking | PCA8574TS
| Always Pb-free |
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| PCA8574AD | 9352 834 89512 | 1.0400 | NA | DIGI-KEY CORPORATION | 1,476 | 10/2/2008 | Buy online | not available |
| PCA8574AD | 9352 834 89518 | 1.0400 | NA | FUTURE ELECTRONICS | 600 | 10/3/2008 | Buy online | Order samples |
| PCA8574AN | 9352 834 92112 | 1.1100 | NA | DIGI-KEY CORPORATION | 941 | 10/2/2008 | Buy online | Order samples |
| PCA8574APW | 9352 837 59112 | 1.0400 | NA | DIGI-KEY CORPORATION | 2,178 | 10/2/2008 | Buy online | not available |
| PCA8574APW | 9352 837 59118 | 1.0400 | Order samples | |||||
| PCA8574ATS | 9352 834 91112 | 1.0400 | NA | DIGI-KEY CORPORATION | 1,350 | 10/2/2008 | Buy online | not available |
| PCA8574ATS | 9352 834 91118 | 1.0400 | not available | |||||
| PCA8574D | 9352 834 85512 | 1.0400 | NA | DIGI-KEY CORPORATION | 1,023 | 10/2/2008 | Buy online | not available |
| PCA8574D | 9352 834 85518 | 1.0400 | not available | |||||
| PCA8574N | 9352 834 86112 | 1.1100 | NA | DIGI-KEY CORPORATION | 1,047 | 10/2/2008 | Buy online | Order samples |
| EU | FARNELL | 880 | 10/3/2008 | Buy online | ||||
| NA | NEWARK | 880 | 10/2/2008 | Buy online | ||||
| PCA8574PW | 9352 837 61112 | 1.0400 | NA | DIGI-KEY CORPORATION | 1,740 | 10/2/2008 | Buy online | not available |
| PCA8574PW | 9352 837 61118 | 1.0400 | Order samples | |||||
| PCA8574TS | 9352 834 87112 | 1.0400 | NA | DIGI-KEY CORPORATION | 1,198 | 10/2/2008 | Buy online | Order samples |
| EU | FARNELL | 1,119 | 10/3/2008 | Buy online | ||||
| NA | NEWARK | 1,119 | 10/2/2008 | Buy online | ||||
| PCA8574TS | 9352 834 87118 | 1.0400 | Order samples |
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Application Notes
Support Documents
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