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| TCA9617B Datasheet, PDF (13/24 Pages) Texas Instruments – Level-Translating FM+ I2C Bus Repeater | |||
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www.ti.com
TCA9617B
SCPS259A â DECEMBER 2014 â REVISED DECEMBER 2014
Typical Application (continued)
10.2.1.2 Detailed Design Procedure
10.2.1.2.1 Pullup Resistor Sizing
For the TCA9617B to function correctly, all devices on the B-side must be able to pull the B-side below the
voltage input low contention level (0.45 V). This means that the VOL of any device on the B-side must be below
0.4 V to ensure proper operation.
The VOL of a device can be adjusted by changing the IOL through the device which is set by the pull-up resistor
value. The pull-up resistor on the B-side must be carefully selected to ensure that logic levels will be transferred
correctly to the A-side.
The B-side pull-up resistor sizing must also ensure that the rise time is greater than 20 ns. Shorter rise times will
increase the pedestal overshoot shown in point 2 of Figure 10.
10.2.1.3 Application Curves
2
1
Figure 10. B-side Pedestal
2
1
Figure 11. B-side Inverted Pedestal
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: TCA9617B
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