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PCA9549 Datasheet

Octal bus switch

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PCA9549
Octal bus switch with individually I2C-bus controlled enables
Rev. 02 — 13 July 2009
Product data sheet
1. 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 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.
2. Features
I 8-bit bus switch (CBT)
I 5 switch connection between two ports
I I2C-bus interface logic; compatible with SMBus standards
I Active LOW RESET input
I 3 address pins allowing up to 8 devices on the I2C-bus
I Bit selection via I2C-bus, in any combination
I Power-up with all bits deselected
I Low Ron switches
I No glitch on power-up
I Supports hot insertion
I Low standby current
I Operating power supply voltage range of 2.3 V to 5.5 V
I 5 V tolerant inputs
I 0 Hz to 400 kHz clock frequency
I ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 1000 V CDM per JESD22-C101
I Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
I Packages offered: SO24, TSSOP24, HVQFN24


NXP Semiconductors Electronic Components Datasheet

PCA9549 Datasheet

Octal bus switch

No Preview Available !

NXP Semiconductors
PCA9549
Octal bus switch with individually I2C-bus controlled enables
3. Ordering information
Table 1. Ordering information
Type number Package
Name
Description
PCA9549D
SO24
plastic small outline package; 24 leads;
body width 7.5 mm
PCA9549PW
TSSOP24 plastic thin shrink small outline package; 24 leads;
body width 4.4 mm
PCA9549BS
HVQFN24 plastic thermal enhanced very thin quad flat package;
no leads; 24 terminals; body 4 × 4 × 0.85 mm
Version
SOT137-1
SOT355-1
SOT616-1
3.1 Ordering options
Table 2. Ordering options
Type number Topside mark
PCA9549D
PCA9549D
PCA9549PW PCA9549
PCA9549BS 9549
Temperature range
40 °C to +85 °C
40 °C to +85 °C
40 °C to +85 °C
4. Block diagram
PCA9549
1A
1B
2A
2B
3A
3B
4A
4B
5A
5B
6A
6B
7A
7B
8A
8B
VSS
VDD
RESET
RESET
CIRCUIT
SWITCH CONTROL LOGIC
SCL
INPUT
I2C-BUS
A0
SDA
FILTER
CONTROL
A1
A2
PCA9549_2
Product data sheet
Fig 1. Block diagram
Rev. 02 — 13 July 2009
002aaa991
© NXP B.V. 2009. All rights reserved.
2 of 25


Part Number PCA9549
Description Octal bus switch
Maker NXP Semiconductors
PDF Download

PCA9549 Datasheet PDF






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