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TCA9546A Datasheet(PDF) 1 Page - Texas Instruments |
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TCA9546A Datasheet(HTML) 1 Page - Texas Instruments |
1 / 31 page TCA9546A Slaves A , A ...A 0 1 N Slaves B , B ...B 0 1 N Slaves C , C ...C 0 1 N Slaves D , D ...D 0 1 N I2C or SMBus Master (e.g. Processor) SDA SCL SD0 SC0 Channel 0 Channel 1 Channel 2 Channel 3 RESET SD1 SC1 SD2 SC2 SD3 SC3 V CC A1 A2 GND A0 Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TCA9546A SCPS205A – APRIL 2014 – REVISED FEBRUARY 2015 TCA9546A Low Voltage 4-Channel I2C and SMBus Switch with Reset Function 1 Features 2 Applications 1 • 1-of-4 Bidirectional Translating Switches • Servers • I2C Bus and SMBus Compatible • Routers (Telecom Switching Equipment) • Active-Low Reset Input • Factory Automation • Three Address Pins, Allowing up to Eight • Products With I2C Slave Address Conflicts (e.g. TCA9546A Devices on the I2C Bus Multiple, Identical Temp Sensors) • Channel Selection Via I2C Bus, in Any 3 Description Combination The TCA9546A is a quad bidirectional translating • Power-up With All Switch Channels Deselected switch controlled via the I2C bus. The SCL/SDA • Low RON Switches upstream pair fans out to four downstream pairs, or • Allows Voltage-Level Translation Between channels. Any individual SCn/SDn channel or 1.8-V, 2.5-V, 3.3-V, and 5-V Buses combination of channels can be selected, determined by the contents of the programmable control register. • No Glitch on Power-up An active-low reset (RESET) input allows the • Supports Hot Insertion TCA9546A to recover from a situation in which one of • Low Standby Current the downstream I2C buses is stuck in a low state. • Operating Power-Supply Voltage Range of 1.65 V Pulling RESET low resets the I2C state machine and to 5.5 V causes all the channels to be deselected, as does the • 5.5 V Tolerant Inputs internal power-on reset function. • 0 to 400-kHz Clock Frequency The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum • Latch-Up Performance Exceeds 100 mA Per high voltage, which will be passed by the TCA9546A. JESD 78 This allows the use of different bus voltages on each • ESD Protection Exceeds JESD 22 pair, so that 1.8-V, 2.5-V, or 3.3-V parts can – 4000-V Human-Body Model (A114-A) communicate with 5-V parts without any additional protection. External pull-up resistors pull the bus up – 1500-V Charged-Device Model (C101) to the desired voltage level for each channel. All I/O pins are 5.5-V tolerant. Device Information(1) DEVICE NAME PACKAGE BODY SIZE (NOM) TSSOP (16) 5.00 mm x 4.40 mm TCA9546A SOIC (16) 9.90 mm x 3.91 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. 4 Simplified Application Diagram 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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