• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 2 answers
  • Subscribers 18 subscribers
  • Views 1141 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN74LVC1G97: ΔIcc characteristic of LVC?

DDdoor
Expert 2315 points
Part Number: SN74LVC1G97

Hello,

Customers are considering adopting SN 74LVC1G97.

Customers want to know characteristics other than ΔIcc Vcc - 0.6 V input.
(Vcc is 5 V.)

Customers can use the following link in Figure 46. Example Typical AC and AHC ICC vs Input Voltage
I see it, is there a ΔIcc characteristic of LVC?

www.ti.com/.../szza036c.pdf

Best regards,
DDdoor

  • 0 in reply to Karan Kotadia
    Expert 2315 points

    Hello,Karan

    Thank you for your reply.

    I confirmed scba010.pdf, but I could not find a figure with VCC = 5V.

    In the data sheet of SN74LVC1G97, delta ICC assumes VCC = 5 V (3 V to 5.5 V)
    Is there a graph when VCC = 5 V?

    Best regards,
    DDdoor

  • 0
    TI__Genius 16725 points
    Hello,

    Is there a reason you are looking for this curve? The curve will be very similar to that you see of the AHC and AC devices.

    The peak of Icc only occurs when the input voltage is operated near 1/2*Vcc. The device should never be operated with the input at 1/2Vcc since this can cause catastrophic damage to the device.

    The Icc value listed in the the datasheet is the maximum value meaning it will never be reached. The typical Icc value is much less than the max that is listed. The peak current will not be of any importance because it is there for a short period of time(transition rate) when then device is switching from one logic state to another.

    Here is the designing with LVC guide that contains this plot under input characteristics: www.ti.com/.../scba010.pdf

    Thanks!
    -Karan
  • 0 in reply to DDdoor
    TI__Genius 16725 points
    Hi DDdoor,

    Can you clarify why you are looking for this curve? We do not have this curve on hand.

    In the datasheet, delta Icc does not assume a Vcc = 5V. It places all inputs at Vcc and tests are done ranging from Vcc = 3V to Vcc = 5.5V. It then takes the max delta Icc recorded which was 500uA. This means that delta Icc will never be higher than 500uA no matter which Vcc you are operating at. The typical delta Icc will actually be much lower than 500uA since this is the max value.

    Thanks!
    -Karan
  • 0 in reply to Karan Kotadia
    Expert 2315 points

    Hello,Karan,

    When a customer uses SN 74 LVC 1 G 97,
    Since the Hi output of the component (5 V power supply) connected to SN74 LVC 1 G 97 is (typical) 3.5 V, in that case,
    3.5 V is out of VCC (5 V) minus 0.6 V specified in the data sheet,
    Whether a large current of 500 uA or more flows,
    Customers are concerned about ΔIcc at this input level.
    So like a document of the other day
    I believe that curves as shown in Figure 46 of szza036c.pdf can be explained to customers if they are LVCs.

    Best regards,
    DDdoor

  • 0 in reply to DDdoor
    TI__Genius 16725 points

    Hello DDdoor,

    I have ordered some samples and will get you the Icc plots with 5Vcc by end of next week.

    Thanks!
    -Karan

  • 0 in reply to Karan Kotadia
    TI__Genius 16725 points

    Hello DDoor,

    I have the Icc plot for you as follows:

    At a Vin of 3.5V we get a Icc = 1.4446 mA. 

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Expert 2315 points

    Hello,
    Karan

    I wanted this curve.
    I will contact the customer as soon as possible.
    I am very grateful for your cooperation.
    Thank you very much.

    Best regards,
    DDdoor