PCA9545A/45B/45C: 4-channel I²C-bus switch with interrupt logic and reset
The PCA9545A/45B/45C is a quad bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND of the four interrupt inputs.
An active LOW reset input allows the PCA9545A/45B/45C to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machine and causes all the channels to be deselected as does the internal power-on reset function.
The pass gates of the switches are constructed such that the VDD pin can be used to limit the maximum high voltage which is passed by the PCA9545A/45B/45C. This allows the use of different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5 V tolerant.
The PCA9545A, PCA9545B and PCA9545C are identical except for the fixed portion of the slave address.
PCA9545A_45B_45C: Product Block Diagram
SOT163-1
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| 4-channel I2C-bus switch with interrupt logic and reset (REV 9.0) PDF (294.0 kB) PCA9545A_45B_45C | 05 May 2014 |
Application Notes (2)
| Name/Description | Modified Date |
|---|---|
| Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN10441 | 20 Jun 2007 |
| PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES (REV 2.0) PDF (807.0 kB) AN262 | 01 Oct 2004 |
Users Guides (3)
| 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 |
| I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM10206 | 13 Jun 2006 |
Brochures (2)
| 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 |
| Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP® 2-, 4-, and 8-channel... (REV 1.0) PDF (641.0 kB) 75016529 | 01 Jul 2008 |
Package Information (3)
| Name/Description | Modified Date |
|---|---|
| plastic small outline package; 20 leads; body width 7.5 mm (REV 1.0) PDF (335.0 kB) SOT163-1 | 08 Feb 2016 |
| plastic thin shrink small outline package; 20 leads; body width 4.4 mm (REV 1.0) PDF (304.0 kB) SOT360-1 | 08 Feb 2016 |
| plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm (REV 1.0) PDF (209.0 kB) SOT662-1 | 08 Feb 2016 |
Packing (3)
| Name/Description | Modified Date |
|---|---|
| HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (266.0 kB) SOT662-1_118 | 18 Apr 2013 |
| SO20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 2.0) PDF (246.0 kB) SOT163-1_118 | 15 Apr 2013 |
| TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 4.0) PDF (225.0 kB) SOT360-1_118 | 15 Apr 2013 |
Supporting Information (3)
| Name/Description | Modified Date |
|---|---|
| Reflow Soldering Profile (REV 1.0) PDF (34.0 kB) REFLOW_SOLDERING_PROFILE | 30 Sep 2013 |
| Wave Soldering Profile (REV 1.0) PDF (20.0 kB) WAVE_SOLDERING_PROFILE | 30 Sep 2013 |
| Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE | 08 Oct 2009 |
Design Support
- Expert mode sample code PCA9545A (REV 1.0) TXT PCA9545A_1 12/10/2014
IBIS Model
- PCA9545A IBIS model (REV 1.0) ZIP PCA9545A 9/2/2014
- PCA9545B IBIS model (REV 1.0) ZIP PCA9545B 9/2/2014
- PCA9545C IBIS model (REV 1.0) ZIP PCA9545C 9/2/2014
Ordering Information
| Product | Status |
|---|---|
| PCA9545BPW | Active |
| PCA9545APW | Active |
| PCA9545AD | Active |
| PCA9545ABS | Active |
| PCA9545CPW | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9545APW |  | SOT360-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9545APW,118 (9352 758 09118) | PA9545A | PCA9545APW |    | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9545APW,112 (9352 758 09112) | PA9545A | PCA9545APW | | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9545AD | | SOT163-1 | Reflow_Soldering_Profile
Wave_Soldering_Profile Reflow_Soldering_Profile Wave_Soldering_Profile | Reel 13" Q1/T1 | Active | PCA9545AD,118 (9352 758 08118) | PCA9545AD | PCA9545AD |  | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9545AD,112 (9352 758 08112) | PCA9545AD | PCA9545AD | | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9545CPW | | SOT360-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9545CPW,118 (9352 833 08118) | PA9545C | PCA9545CPW | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
| PCA9545BPW | | SOT360-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9545BPW,118 (9352 833 07118) | PA9545B | PCA9545BPW | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
| PCA9545ABS |  | SOT662-1 | Reel 13" Q1/T1 | Active | PCA9545ABS,118 (9352 758 07118) | 9545A | PCA9545ABS | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
- 4-channel I2C-bus switch with interrupt logic and reset pca9545a_45b_45c
- Level shifting techniques in I2C-bus design pca9685pw
- PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES pca9516apw
- I2C-bus specification and user manual pca9685pw
- I2C-bus specification and user manual pca9685pw
- 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
- Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP® 2-, 4-, and 8-channel... pca9548a
- Expert mode sample code PCA9545A PCA9545APW
- PCA9545A IBIS model PCA9545APW
- PCA9545B IBIS model PCA9545BPW
- PCA9545C IBIS model PCA9545CPW
- SOT163-1 LPC1112FD20
- Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
- Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
- Reel 13" Q1/T1 LPC812M101JD20
- SOT360-1 LPC1112FDH20
- SSOP-TSSOP-VSO-WAVE LPC1114FDH28
- Reel 13" Q1/T1 LPC824M201JDH20
- plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm bga3131
- HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... bga3131
- PCA9545A_45B_45C
- SA615
- PCA9634
- BGA3031
