PCA9557: 8-bit I2C-bus and SMBus I/O port with reset
The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I²C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I²C-bus/SMBus interface. It has low current consumption and a high-impedance open-drain output pin, IO0.
The system master can enable the PCA9557's I/O as either input or output by writing to the configuration register. The system master can also invert the PCA9557 inputs by writing to the active HIGH polarity inversion register. Finally, the system master can reset the PCA9557 in the event of a time-out by asserting a LOW in the reset input.
The power-on reset puts the registers in their default state and initializes the I²C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to occur without de-powering the part.
PCA9557: Product Block Diagram
PCA9557: Block Diagram
sot629-1_3d
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| 8-bit I2C-bus and SMBus I/O port with reset (REV 7.0) PDF (282.0 kB) PCA9557 | 10 Dec 2013 |
Application Notes (6)
| Name/Description | Modified Date |
|---|---|
| Driving stepper motors using NXP® I2C-bus GPIO expanders (REV 2.0) PDF (275.0 kB) AN10814 | 24 Oct 2011 |
| PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus (REV 1.0) PDF (90.0 kB) AN256 | 23 Mar 2009 |
| Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN10441 | 20 Jun 2007 |
| I2C/SMBus general purpose I/O expanders (REV 2.0) PDF (294.0 kB) AN469 | 20 Jan 2005 |
| PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES (REV 2.0) PDF (807.0 kB) AN262 | 01 Oct 2004 |
| I2C manual (REV 1.0) PDF (4.2 MB) AN10216 | 27 Mar 2003 |
Users Guides (4)
| Name/Description | Modified Date |
|---|---|
| I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM10204 | 28 Apr 2014 |
| I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA | 03 Apr 2013 |
| PCA9698 demonstration board OM6281 (REV 1.0) PDF (558.0 kB) UM10267 | 26 Sep 2008 |
| I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM10206 | 13 Jun 2006 |
Brochures (3)
| Name/Description | Modified Date |
|---|---|
| NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 75017540 | 01 Aug 2014 |
| Convenient parallel I/O expansion or collection via the I2C/SMBus; NXP® Octal SMBus registered interface... (REV 1.2) PDF (377.0 kB) 750_16534 | 01 Aug 2008 |
| Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for... (REV 1.0) PDF (1.1 MB) 75016543 | 01 Jun 2008 |
Package Information (3)
| Name/Description | Modified Date |
|---|---|
| plastic small outline package; 16 leads; body width 3.9 mm (REV 1.0) PDF (192.0 kB) SOT109-1 | 08 Feb 2016 |
| plastic thin shrink small outline package; 16 leads; body width 4.4 mm (REV 1.0) PDF (300.0 kB) SOT403-1 | 08 Feb 2016 |
| plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm (REV 1.0) PDF (200.0 kB) SOT629-1 | 08 Feb 2016 |
Packing (4)
| Name/Description | Modified Date |
|---|---|
| HVQFN16; Reel pack; SMD, 13" Q2/T3 Standard product orientation Orderable part number ending ,128 or... (REV 1.0) PDF (189.0 kB) SOT629-1_128 | 14 Dec 2015 |
| SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 4.0) PDF (210.0 kB) SOT109-1_118 | 24 Apr 2013 |
| HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (259.0 kB) SOT629-1_118 | 17 Apr 2013 |
| TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (218.0 kB) SOT403-1_118 | 08 Apr 2013 |
Reports or Presentations (1)
| Name/Description | Modified Date |
|---|---|
| design_con_2003_tecforum_i2c_b_1 (REV 0.1) PDF (4.2 MB) DESIGN_CON_2003_TECFORUM_I2C_B_1 | 27 Jan 2003 |
Supporting Information (3)
| Name/Description | Modified Date |
|---|---|
| Footprint for reflow soldering (REV 1.0) PDF (9.0 kB) SO-SOJ-REFLOW | 08 Oct 2009 |
| Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE | 08 Oct 2009 |
| Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE | 08 Oct 2009 |
Design Support
- Expert mode sample code for PCA9557 (REV 1.0) TXT 8-BIT-PCA9557-TOTEM-POLE-READ- 12/10/2014
IBIS Model
- PCA9557 IBIS model (REV 1.2) ibs PCA9557_1 9/11/2014
Ordering Information
| Product | Status |
|---|---|
| PCA9557PW | Active |
| PCA9557BS | Active |
| PCA9557D | Active |
Package Information
| Product ID | Package Description | Outline Version | Reflow/Wave Soldering | Packing | Product Status | Part NumberOrdering code(12NC) | Marking | Chemical Content | RoHS / Pb Free / RHF | LeadFree Conversion Date | EFR | IFR(FIT) | MTBF(hour) | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9557D |  | SOT109-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE | Reel 13" Q1/T1 | Active | PCA9557D,118 (9352 706 74118) | PCA9557D | PCA9557D |    | week 6, 2004 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9557D,112 (9352 706 74112) | PCA9557D | PCA9557D | | week 6, 2004 | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9557BS | | SOT629-1 | Reel 13" Q2/T3 | Active | PCA9557BSHP (9352 727 75128) | 9557 | PCA9557BS |  | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 | |
| Reel 13" Q1/T1 | Active | PCA9557BS,118 (9352 727 75118) | 9557 | PCA9557BS | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9557PW |  | SOT403-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9557PW,118 (9352 706 69118) | PCA9557 | PCA9557PW | | week 48, 2004 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9557PW,112 (9352 706 69112) | PCA9557 | PCA9557PW | | week 48, 2004 | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9557PW/G | | SOT403-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Withdrawn | PCA9557PW/G,118 (9352 764 27118) | PCA9557 | | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 |
- Driving stepper motors using NXP® I2C-bus GPIO expanders pca9698
- PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus PCA9553
- Level shifting techniques in I2C-bus design pca9685pw
- I2C/SMBus general purpose I/O expanders pcf8575ts
- PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES pca9516apw
- I2C manual se98apw
- I2C-bus specification and user manual pca9685pw
- I2C-bus specification and user manual pca9685pw
- PCA9698 demonstration board OM6281 PCA9553
- I2C Demonstration Board 2005-1 Quick Start Guide pca9685pw
- NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns pca9685pw
- Convenient parallel I/O expansion or collection via the I2C/SMBus; NXP® Octal SMBus registered interface... pca9557
- Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for... PMEG6010CE_AUTOMOTIVE
- design_con_2003_tecforum_i2c_b_1 lm75a
- Expert mode sample code for PCA9557 PCA9557PW
- PCA9557 IBIS model PCA9557PW
- plastic small outline package; 16 leads; body width 3.9 mm NPIC6C596A_Q100
- Footprint for reflow soldering NPIC6C596A_Q100
- Footprint for wave soldering NPIC6C596A_Q100
- SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... NPIC6C596A_Q100
- plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm PCA9633
- HVQFN16; Reel pack; SMD, 13" Q2/T3 Standard product orientation Orderable part number ending ,128 or... PCA9551
- HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... PCA9633
- SOT403-1 LPC812M101JDH16
- SSOP-TSSOP-VSO-WAVE LPC1114FDH28
- Reel 13" Q1/T1 LPC812M101JDH16
- PCA9557
- PCA9557
- SA614A
- PCA9633
- PCA9633
