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TCA9509DGKR Datasheet(PDF) 2 Page - Texas Instruments |
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TCA9509DGKR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 18 page TCA9509 SCPS225B – AUGUST 2011 – REVISED JANUARY 2012 www.ti.com ORDERING INFORMATION ORDERABLE PART TA PACKAGES(1) (2) TOP-SIDE MARKING NUMBERS –40°C to 85°C TCA9509RVHR RVH - QFN Tape and reel 7K –40°C to 85°C TCA9509DGKR DGK - MSOP Tape and reel 7KQ (1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. (2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. DESCRIPTION/ORDERING INFORMATION (CONTINUED) The bus port B drivers are compliant with SMBus I/O levels, while the A side uses a current sensing mechanism to detect the input or output LOW signal which prevents bus lock-up. The A side uses a 1 mA current source for pull-up and a 200 Ω pull-down driver. This results in a LOW on the A side accommodating smaller voltage swings. The output pull-down on the A side internal buffer LOW is set for approximately 0.2 V, while the input threshold of the internal buffer is set about 50 mV lower than that of the output voltage LOW. When the A side I/O is driven LOW internally, the LOW is not recognized as a LOW by the input. This prevents a lock-up condition from occurring. The output pull-down on the B side drives a hard LOW and the input level is set at 0.3 of SMBus or I2C-bus voltage level which enables B side to connect to any other I2C-bus devices or buffer. The TCA9509 drivers are not enabled unless VCCA is above 0.8 V and VCCB is above 2.5 V. The enable (EN) pin can also be used to turn the drivers on and off under system control. Caution should be observed to only change the state of the EN pin when the bus is idle. an 2 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Product Folder Link(s): TCA9509 |
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