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PCA9549
Datasheet
General 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 I2-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 RESETinput
- 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
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCA9549BS | PCA9549BS-T | 9352 822 28118 | Volume production | SOT616-1
(HVQFN24) | Reel Pack, SMD, 13" | Standard Marking | PCA9549BS
| Always Pb-free |
| PCA9549D | PCA9549D | 9352 822 29112 | Volume production | SOT137-1
(SO24) | Tube | Standard Marking | PCA9549D
| Always Pb-free |
| PCA9549D | PCA9549D-T | 9352 822 29118 | Volume production | SOT137-1
(SO24) | Reel Pack, SMD, 13" | Standard Marking | PCA9549D
| Always Pb-free |
| PCA9549PW | PCA9549PW | 9352 822 31112 | Volume production | SOT355-1
(TSSOP24) | Tube | Standard Marking | PCA9549PW
| Always Pb-free |
| PCA9549PW | PCA9549PW-T | 9352 822 31118 | Volume production | SOT355-1
(TSSOP24) | Reel Pack, SMD, 13" | Standard Marking | PCA9549PW
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| PCA9549BS | 9352 822 28118 | NA | DIGI-KEY CORPORATION | 6,000 | 8/5/2008 | Buy online | Order samples | |
| PCA9549D | 9352 822 29112 | NA | DIGI-KEY CORPORATION | 577 | 8/5/2008 | Buy online | Order samples | |
| PCA9549D | 9352 822 29118 | NA | DIGI-KEY CORPORATION | 2,000 | 8/5/2008 | Buy online | not available | |
| PCA9549PW | 9352 822 31112 | NA | DIGI-KEY CORPORATION | 853 | 8/5/2008 | Buy online | not available | |
| PCA9549PW | 9352 822 31118 | Order samples |
Applications
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Technical documents
Application Notes
AN10441_1;
Level shifting techniques in I (20-Jun-07)
Support Documents
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
Parametrics/similar products
| Type number | Package | Operating temp.(Cel) | I²C-bus(kHz) | Operating voltage(VDC) | Inputs | Outputs | # of Addresses | Reset input pin |
|---|---|---|---|---|---|---|---|---|
| PCA9549BS | SOT616-1
(HVQFN24) | -40~85 | 400 | 2.3~5.5 | 8 | 8 | 8 | yes |
| PCA9549D | SOT137-1
(SO24) | -40~85 | 400 | 2.3~5.5 | 8 | 8 | 8 | yes |
| PCA9549PW | SOT355-1
(TSSOP24) | -40~85 | 400 | 2.3~5.5 | 8 | 8 | 8 | yes |
Similar products
PCA9549 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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