PCA9542A: 2-channel I2C-bus multiplexer and interrupt logic
The PCA9542A is a 1-of-2 bidirectional translating multiplexer, controlled via the I²C-bus. The SCL/SDA upstream pair fans out to two SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. Two interrupt inputs, INT0 and INT1, one for each of the SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an AND of the two interrupt inputs, is provided.
A power-on reset function puts the registers in their default state and initializes the I²C-bus state machine with no channels selected.
The pass gates of the multiplexer are constructed such that the VDD pin can be used to limit the maximum high voltage which will be passed by the PCA9542A. This allows the use of different bus voltages on each SCx/SDx pair, so that 1.8 V, 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.
PCA9542A: Product Block Diagram
sot108-1_3d
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| 2-channel I2C-bus multiplexer and interrupt logic (REV 5.1) PDF (282.0 kB) PCA9542A | 15 Jul 2015 |
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 (2)
| Name/Description | Modified Date |
|---|---|
| plastic small outline package; 14 leads; body width 3.9 mm (REV 1.0) PDF (166.0 kB) SOT108-1 | 08 Feb 2016 |
| plastic thin shrink small outline package; 14 leads; body width 4.4 mm (REV 1.0) PDF (285.0 kB) SOT402-1 | 08 Feb 2016 |
Packing (2)
| Name/Description | Modified Date |
|---|---|
| SO14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 4.0) PDF (207.0 kB) SOT108-1_118 | 08 Apr 2013 |
| TSSOP14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (217.0 kB) SOT402-1_118 | 08 Apr 2013 |
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 PCA9542A (REV 1.0) TXT PCA9542A-CONNECTS-TO-CH0-OR-CH1 12/10/2014
IBIS Model
- PCA9542A IBIS model (REV 1.0) ZIP PCA9542A_1 9/2/2014
Ordering Information
| Product | Status | Package version | Operating Temperature (Cel) | Operating voltage (VDC) | Inputs | Outputs | No of Addresses | I2C-bus (kHz) |
|---|---|---|---|---|---|---|---|---|
| PCA9542AD | Active | SOT108-1 | -40~85 | 2.3~5.5 | 1 | 2 | 8 | 400 |
| PCA9542APW | Active | SOT402-1 | -40~85 | 2.3~5.5 | 1 | 2 | 8 | 400 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9542AD | | SOT108-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE | Reel 13" Q1/T1 | Active | PCA9542AD,118 (9352 758 01118) | PCA9542AD | PCA9542AD |    | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9542AD,112 (9352 758 01112) | PCA9542AD | PCA9542AD | | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9542APW |  | SOT402-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9542APW,118 (9352 758 02118) | PA9542A | PCA9542APW |  | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9542APW,112 (9352 758 02112) | PA9542A | PCA9542APW | | week 13, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9542APW/DG | | SOT402-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9542APW/DG,118 (9352 869 37118) | PA9542A | PCA9542APW/DG | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
- 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 PCA9542A PCA9542APW
- PCA9542A IBIS model PCA9542APW
- plastic small outline package; 14 leads; body width 3.9 mm 74LV164_Q100
- Footprint for reflow soldering NPIC6C596A_Q100
- Footprint for wave soldering NPIC6C596A_Q100
- SO14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... 74LV164_Q100
- plastic thin shrink small outline package; 14 leads; body width 4.4 mm 74LV164_Q100
- SSOP-TSSOP-VSO-WAVE LPC1114FDH28
- TSSOP14; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... 74LV164_Q100
- PCA9542A
- UBA2213
- 74LV164
