PCA9549

Octal bus switch with individually I2C-bus controlled enables


Product description

The PCA9549 provides eight bits of high speed TTL-compatible bus switching controlled by the I2C-bus. The low ON-state resistance of the switch allows connections to be made with minimal propagation delay. Any individual A to B channel or combination of channels can be selected via the I2C-bus, determined by the contents of the programmable Control register. When the I2C-bus bit is HIGH (logic 1), the switch is on and data can flow from Port A to Port B, or vice versa. When the I2C-bus bit is LOW (logic 0), the switch is open, creating a high-impedance state between the two ports, which stops the data flow.

An active LOW reset input (RESET) allows the PCA9549 to recover from a situation where the I2C-bus is stuck in a LOW state. Pulling the RESET pin LOW resets the I2C-bus state machine and causes all the bits to be open, as does the internal power-on reset function.

Three address pins allow up to eight devices on the same bus.

Features

  • 8-bit bus switch (CBT)
  • 5 Ohm switch connection between two ports
  • I2C-bus interface logic; compatible with SMBus standards
  • Active LOW RESET input
  • 3 address pins allowing up to 8 devices on the I2C-bus
  • Bit selection via I2C-bus, in any combination
  • Power-up with all bits deselected
  • Low Ron switches
  • No glitch on power-up
  • Supports hot insertion
  • Low standby current
  • Operating power supply voltage range of 2.3 V to 5.5 V
  • 5 V tolerant inputs
  • 0 Hz to 400 kHz clock frequency
  • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Packages offered: SO24, TSSOP24, HVQFN24
All information on this product information page is subject to the subsequent disclaimers:

Devices listed on this page should not be used for new designs!

This product has been discontinued.
Click here for discontinuation information.

Show functional diagram

Block diagram: PCA9549BS, PCA9549D, PCA9549PW
Block diagram: PCA9549BS, PCA9549D, PCA9549PW

Products / Packages

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
PCA9549BSPCA9549BS,1189352 822 28118Discontinued
Replacement product		SOT616-1
(HVQFN24) 		Reel Pack, SMD, 13"Standard Marking
PCA9549DPCA9549D,1129352 822 29112Discontinued
Replacement product		SOT137-1
(SO24) 		TubeStandard Marking
PCA9549DPCA9549D,1189352 822 29118Discontinued
Replacement product		SOT137-1
(SO24) 		Reel Pack, SMD, 13"Standard Marking
PCA9549PWPCA9549PW,1129352 822 31112Discontinued
Replacement product		SOT355-1
(TSSOP24) 		TubeStandard Marking
PCA9549PWPCA9549PW,1189352 822 31118Discontinued
Replacement product		SOT355-1
(TSSOP24) 		Reel Pack, SMD, 13"Standard Marking

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCA9549BS93528222811830-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549D93528222911230-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549D93528222911830-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549PW93528223111230-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549PW93528223111830-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.

Quality, reliability & chemical content

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA9549BSPCA9549BS,118PCA9549BSAlways Pb-free11
PCA9549DPCA9549D,112PCA9549DAlways Pb-freenullnull11
PCA9549DPCA9549D,118PCA9549DAlways Pb-freenullnull11
PCA9549PWPCA9549PW,112PCA9549PWAlways Pb-free11
PCA9549PWPCA9549PW,118PCA9549PWAlways Pb-free11
Quality and reliability disclaimer

Quality and reliability disclaimer

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Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCA9549BS93528222811830-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549D93528222911230-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549D93528222911830-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549PW93528223111230-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.
PCA9549PW93528223111830-Sep-1131-Dec-11NoneDN 67
  • Sole source product
  • Type number fully withdrawn
  • Standard availability
Standard End of Life.

Documentation for this product

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