DS90LT012AQ-Q1: Customer want to add a pull up 2.4V output, is it ok?

Jon WANG

Part Number: DS90LT012AQ-Q1

Tool/software:

The customer is using DS90LT012AQMF∝PB on U13, and the minimum output short-circuit current in datasheet is also above 15mA. Customer will then add a pull up 2.4V output, with a current of -2.4/400=-6mA, May Customer ask if it can be used in this way and if it will cause damage to the chip?Thanks.

10 months ago

0 Clemens Ladisch 10 months ago

Guru 317370 points

The absolute maximum ratings allow up to 100 mA, so 6 mA will not damage the device. But for currents above 2 mA, V_OL is no longer guaranteed.

The Ro pin outputs 3.3 V when high. Why is the pull-up to a lower voltage? Is this an attempt at level shifting?

0 Amy 10 months ago

TI__Genius 15321 points

Hello,

As long as the datasheet parameters are followed there should be no damage to the device.

However, as Clemens mentions, it would best to select a 2.5V compatible device if 2.5V out is desired.

Please refer to this application for receiver options with integrated level shifting: Level Shift No More: Support Low Voltage I/O Signals into a FPGA, Processor, or ASIC (Rev. A)

Thanks, Amy

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DS90LT012AQ-Q1: Customer want to add a pull up 2.4V output, is it ok?