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SN54AC240, 5962-87550 pin output current?

Jamaal_Charles
Genius 3245 points


 

The 54AC240 part on DSCC SMD (Standard Microcircuit Drawing) 5962-87550 is shown as +/-50mA per output pin, but "DC Vcc or GND current (per pin) (ICC,IGND) is also shown as just the same +/-50mA.

Can all 8 output pins can run 50mA each at the same time, or only 50mA total across the 8?

Also, on the power dissipation limits, can you explicitly confirm that the DC power and ground pins on the device type 01 (20 pin packages) can handle 400mA for 8 output pin simulataneously driving at 50mA each total?

 Thank You

  • TI__Guru 62930 points

    Jamaal,

    From the TI datasheet perspective, this is defined by the absolute max section.  There is a line that indicates continuous current through VCC or GND.  This is max of 200ma.  So, this is the limiting factor from the TI perspective.

    I am not as familiar with the SMD datasheets.   I took a look and did not see this same information.

    However, there is a max power dissipation.  If this is treated as steady state, this would be equivalent to 250ma at 2v (min vcc), and 83ma at 6v (max vcc).  At 2.5v, it would be equivalent to the 200ma restriction imposed by the TI datasheet from a max power dissipation perspective.

    Regards,

    Wade