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TCA4307 Datasheet(PDF) 1 Page - Texas Instruments |
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TCA4307 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 26 page TCA4307 Hot Swappable I2C Bus and SMBus Buffer with Stuck Bus Recovery 1 Features • Supports bidirectional data transfer of I2C bus signals • Operating power-supply voltage range of 2.3 V to 5.5 V • TA ambient air temperature range of -40 °C to 125 °C • Stuck bus recovery featuring automatic bus recovery • 1-V Precharge on all SDA and SCL lines prevents corruption during live insertion • Accommodates standard mode and fast mode I2C devices • Supports clock stretching, arbitration and synchronization • Powered-off high-impedance I2C pins 2 Applications • Servers • Enterprise Switching • Telecom switching equipment • Base stations • Industrial automation equipment 3 Description The TCA4307 is a hot-swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock lines. Control circuitry prevents the backplane-side I2C lines (in) from being connected to the card-side I2C lines (out) until a stop command or bus idle condition occurs on the backplane without bus contention on the card. When the connection is made, this device provides bidirectional buffering, keeping the backplane and card capacitances isolated. During insertion, the SDA and SCL lines are pre-charged to 1 V to minimize the current required to charge the parasitic capacitance of the device. The TCA4307 has stuck bus recovery, which automatically disconnects the bus if it detects either SDAOUT or SCLOUT are low for about 40 ms. Once the bus is disconnected, the device automatically generates up to 16 pulses on SCLOUT to attempt to reset the device which is holding the bus low. When the I2C bus is idle, the TCA4307 can be put into shutdown mode by setting the EN pin low, reducing power consumption. When EN is pulled high, the TCA4307 resumes normal operation. It also includes an open drain READY output pin, which indicates that the backplane and card sides are connected together. When READY is high, the SDAIN and SCLIN are connected to SDAOUT and SCLOUT. When the two sides are disconnected, READY is low. Device Information PART NUMBER PACKAGE(1) BODY SIZE (NOM) TCA4307 VSSOP (8) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. GND READY ENABLE SDAIN SCLIN SDAOUT SCLOUT VCC 1 6 3 8 2 7 5 4 Simplified Schematic www.ti.com TCA4307 SCPS270 – AUGUST 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 1 Product Folder Links: TCA4307 TCA4307 SCPS270 – AUGUST 2020 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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