PCA9540B: 2-channel I²C-bus multiplexer
The PCA9540B 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.
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 that is passed by the PCA9540B. 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 can pull the bus up to the desired voltage level for this channel. All I/O pins are 5 V tolerant.
sot096-1_3d
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| 2-channel I2C-bus multiplexer (REV 7.0) PDF (290.0 kB) PCA9540B | 31 Oct 2016 |
Application Notes (3)
| Name/Description | Modified Date |
|---|---|
| MicroPak soldering information (REV 2.0) PDF (245.0 kB) AN10343 | 30 Dec 2010 |
| 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 thin shrink small outline package; 8 leads; body width 3 mm (REV 1.0) PDF (240.0 kB) SOT505-1 | 08 Feb 2016 |
| plastic small outline package; 8 leads; body width 3.9 mm (REV 1.0) PDF (244.0 kB) SOT96-1 | 08 Feb 2016 |
| plastic extremely thin small outline package; no leads; 8 terminals; body 3 x 2 x 0.5 mm (REV 1.0) PDF (190.0 kB) SOT996-2 | 08 Feb 2016 |
Packing (3)
| Name/Description | Modified Date |
|---|---|
| XSON8(U); Reel pack, Reverse; SMD, 7" Q3/T4 Standard product orientation Orderable part number ending ,125 or... (REV 5.0) PDF (200.0 kB) SOT996-2_125 | 02 May 2013 |
| SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 2.0) PDF (232.0 kB) SOT96-1_118 | 19 Apr 2013 |
| TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (214.0 kB) SOT505-1_118 | 15 Apr 2013 |
Supporting Information (4)
| 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 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 |
IBIS Model
- PCA9540B IBIS model (REV 1.0) ZIP PCA9540B_1 9/2/2014
Ordering Information
| Product | Status | Package version | Operating Temperature (Cel) | Operating voltage (VDC) | Inputs | Outputs | No of Addresses | I2C-bus (kHz) |
|---|---|---|---|---|---|---|---|---|
| PCA9540BGD | Active | SOT996-2 | -40~85 | 2.3~5.5 | 1 | 2 | 1 | 400 |
| PCA9540BDP | Active | SOT505-1 | -40~85 | 2.3~5.5 | 1 | 2 | 1 | 400 |
| PCA9540BD | Active | SOT96-1 | -40~85 | 2.3~5.5 | 1 | 2 | 1 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9540BD | | SOT96-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE | Reel 13" Q1/T1 | Active | PCA9540BD,118 (9352 760 35118) | PA9540B | PCA9540BD |    | week 5, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9540BD,112 (9352 760 35112) | PA9540B | PCA9540BD | | week 5, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 | ||||
| PCA9540BDP |  | SOT505-1 | Reflow_Soldering_Profile | Reel 13" Q1/T1 | Active | PCA9540BDP,118 (9352 760 36118) | 9540B | PCA9540BDP | | week 12, 2005 | 0.0 | 2.0 | 5E8 | 1 | 1 |
| PCA9540BDP/DG | | SOT505-1 | Reflow_Soldering_Profile | Reel 13" Q1/T1 | Withdrawn | PCA9540BDP/DG,118 (9352 933 84118) | 9540B | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 | |
| PCA9540BDP/Q900 | | SOT505-1 | Reflow_Soldering_Profile | Reel 13" Q1/T1 | Development | PCA9540BDP/Q900J (9353 320 86118) | Standard Marking | 0.0 | 2.0 | 5E8 | |||||
| PCA9540BGD |  | SOT996-2 | Reel 7" Q3/T4, Reverse | Active | PCA9540BGD,125 (9352 901 65125) | 40B | PCA9540BGD | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
- 2-channel I2C-bus multiplexer pca9540b
- MicroPak soldering information NTS0102_Q100
- 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
- Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
- PCA9540B IBIS model PCA9540BDP
- plastic small outline package; 8 leads; body width 3.9 mm CBT3306_Q100
- Footprint for reflow soldering NPIC6C596A_Q100
- Footprint for wave soldering NPIC6C596A_Q100
- SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... CBT3306_Q100
- plastic thin shrink small outline package; 8 leads; body width 3 mm pesd5v0l7bas
- Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
- TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... pesd5v0l7bas
- plastic extremely thin small outline package; no leads; 8 terminals; body 3 x 2 x 0.5 mm 74AHC_T_3G14_Q100
- XSON8(U); Reel pack, Reverse; SMD, 7" Q3/T4 Standard product orientation Orderable part number ending ,125 or... 74AHC_T_3G14_Q100
- SA612A
- PCT2075
- LM75B
