SCAA124 April   2015 RM41L232 , RM42L432 , RM44L520 , RM44L920 , RM46L430 , RM46L440 , RM46L450 , RM46L830 , RM46L840 , RM46L850 , RM46L852 , RM48L530 , RM48L540 , RM48L730 , RM48L740 , RM48L940 , RM48L950 , RM48L952 , RM57L843 , TMS570LC4357 , TMS570LC4357-EP , TMS570LC4357-SEP , TMS570LS0232 , TMS570LS0332 , TMS570LS0432 , TMS570LS0714 , TMS570LS0714-S , TMS570LS0914 , TMS570LS1114 , TMS570LS1115 , TMS570LS1224 , TMS570LS1225 , TMS570LS1227 , TMS570LS2124 , TMS570LS2125 , TMS570LS2134 , TMS570LS2135 , TMS570LS3134 , TMS570LS3135 , TMS570LS3137

 

  1.   Latch-Up
    1.     Trademarks
    2. 1 Introduction
      1. 1.1 What is Latch-Up?
      2. 1.2 Latch-Up Model
      3. 1.3 Mitigating Latch-Up
    3. 2 Latch-Up Testing Methods
      1. 2.1 Latch-Up Standard
      2. 2.2 Current Injection Stress
      3. 2.3 Over-Voltage Stress
      4. 2.4 Signal Latch-Up
      5. 2.5 Analog Product Testing
        1. 2.5.1 Maximum Stress Voltage for Latch-Up (MSV)
        2. 2.5.2 Stressing Special Pins
        3. 2.5.3 High Voltage Testing
    4. 3 References

2.1 Latch-Up Standard

The current Latch-Up standard, JESD78, stresses pins categorized by type. These types are input, output, bi-directional (I/O), power supply and ground. Input, output and bi-directional pins, in most cases, receive a current stress pulse. The power supply receives an over-voltage stress, a voltage pulse. The pulse widths can be chosen from a range of values but most often in the industry, 2 ms to 10 ms is preferred. The current pulse height typical values are 100 mA while the over-voltage is 1.5 x VMAX (operating). Products requiring clocking or other timing signals can use test vectors in either a Latch-Up tester or an ATE. Timing or pins receiving vectors generally are not stressed since the stress pulse may interfere with the part set-up creating a false failure. Figure 4, Figure 5 and Figure 6 show the stress waveforms from JESD78.

positive_current_palse_wf_F4.gifFigure 4. Positive Current Pulse Waveform
negative_current_palse_wf_F5.gifFigure 5. Negative Current Pulse Waveform
over_voltage_stress_wf_F6.gifFigure 6. Over-Voltage Stress Waveform