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SN74AHC8541: Inquire customer SCH concern

user4773172
Intellectual 1410 points
Part Number: SN74AHC8541

Hi Sir,

May I have your help on following question from my customer?

1. Please refer SCH from customer, when the Host pull low, SN74AHC8541 output be pulled low to reset other device, is there any concern that SN74AHC8541 will be damaged by discharge current from C5? (Please be noted that R5, R6, C6 and 66ohm can't be changed)

2. May I know what the definition of Low-level output current? What is the Y pin current-sinking capability when output pull-low?

3. May I confirm with you that there is push-pull circuit inside the Y pin to control the high/low? What resistor value of Y pin during pull-low status?

Thank you.

Edward Chen

  • 0
    Guru 284840 points

    The absolute maximum rating is 25 mA per pin, so this can indeed damage the device.

    The 6 mA recommended operating condition is simply the current at which VOL is specified. In other words, at larger currents, there is no guaranteed upper limit for the voltage drop.

    In the worst case, 0.44 V / 6 mA = 73.3 Ω. The typical output impedance will be lower, about 37 Ω, but that will result in a current of more than 30 mA, which is still too muc.h.