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PCA9546A Datasheet

4-channel I2C switch

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PCA9546A
4-channel I2C switch with reset
Rev. 03 — 6 April 2005
Product data sheet
1. General description
The PCA9546A is a quad bi-directional translating switch controlled via the I2C-bus. The
SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual
SCx/SDx channel or combination of channels can be selected, determined by the
contents of the programmable control register.
An active LOW reset input allows the PCA9546A to recover from a situation where one of
the downstream I2C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the
I2C-bus state machine and causes all the channels to be deselected as does the internal
Power-On Reset (POR) function.
The pass gates of the switches are constructed such that the VDD pin can be used to limit
the maximum high voltage which will be passed by the PCA9546A. This allows the use of
different bus voltages on each pair, so that 1.8 V or 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.
2. Features
s 1-of-4 bi-directional translating switches
s I2C-bus interface logic; compatible with SMBus standards
s Active LOW reset input
s 3 address pins allowing up to 8 devices on the I2C-bus
s Channel selection via I2C-bus, in any combination
s Power-up with all switch channels deselected
s Low Ron switches
s Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
s No glitch on power-up
s Supports hot insertion
s Low stand-by current
s Operating power supply voltage range of 2.3 V to 5.5 V
s 5 V tolerant Inputs
s 0 kHz to 400 kHz clock frequency
s ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
s Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
s Three packages offered: SO16, TSSOP16, and HVQFN16


NXP Semiconductors Electronic Components Datasheet

PCA9546A Datasheet

4-channel I2C switch

No Preview Available !

Philips Semiconductors
PCA9546A
4-channel I2C switch with reset
3. Ordering information
Table 1: Ordering information
Tamb = 40 °C to +85 °C
Type number Package
Name
Description
Version
PCA9546ABS HVQFN16 plastic thermal enhanced very thin quad flat package; SOT629-1
no leads; 16 terminals; body 4 × 4 × 0.85 mm
PCA9546AD SO16
plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
PCA9546APW TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
Standard packing quantities and other packaging data are available at
www.standardics.philips.com/packaging.
4. Marking
Table 2: Marking codes
Type number Topside mark
PCA9546ABS 546A
PCA9546AD
PCA9546AD
PCA9546APW PA9546A
9397 750 14318
Product data sheet
Rev. 03 — 6 April 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
2 of 25


Part Number PCA9546A
Description 4-channel I2C switch
Maker NXP
Total Page 25 Pages
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