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DS90LT012A: Current Drive Capability

Zachary Davis
Prodigy 70 points

Part Number: DS90LT012A

Hello,

What is the typical current this chip can source while driving an output high? I had trouble finding on the Recommended Operating Conditions. 

  • 0
    TI__Mastermind 43795 points

    Hi Zachary,

    The typical output impedance when driving a high level can be estimated by the datasheet  (IOH = 0.4mA, VOH = 3.1V, and VDD = 3.3V).

    Rout = (3.3V - 3.1V) / 0.0004A

    Rout = 500 Ohms

    In this case the datasheet seems to be very conservative as the IBIS model shows ~ -10mA is available at a Vout of 3.1V. This gives an Rout = 20 Ohms.  This is similar to the original design review which has simulations showing Rout = 25 Ohms (typical).

    Regards,

    Lee