6 SET Results

The LMP7704-SP was characterized for SETs from 2 to 85MeV-cm²/mg. Table 6-2 lists the ions used for the testing.The device was tested at room temperature in a buffer configuration with the four different setups show in Table 6-1. A flux of 10⁴ ions/s-cm² was used for all SET runs. The SETs discussed in this report were defined as output voltages that exceeded a window trigger of 5% from the expected output. Both positive and negative upsets were observed during the testing.

The number of events observed during the heavy ion runs are presented in Table 6-3 to Table 6-6. All four channels were monitored during the heavy ion runs. LMP7704-SP was tested to fluences ranging from 10⁶ to 2 × 10⁶ ions/cm².

Figure 6-1 to Figure 6-8 show the worst-case positive and negative transients at 85MeV-cm²/mg for each test configuration. Importantly, no SETs were observed that reached the voltage supply levels.

When testing with V_S = ±1.35V, Gain = 1, the worst-case positive transient occurred on channel 2 and reached a peak value of 1.189V. The event lasted 1.2µs. The worst-case negative transient occurred on channel 1 and reached a peak value of 0.79V. The event lasted 0.39µs.

Figure 6-1 Worst-Case Positive Transient on Run #4 With V_S = ±1.35V, Gain = 1

Figure 6-2 Worst-Case Negative Transient on Run #4 With V_S = ±1.35V, Gain = 1

When testing with V_S = ±6V, Gain = 1, the worst-case positive transient occurred on channel 2 and reached a peak value of 2.34V. The event lasted 0.81µs. The worst-case negative transient occurred on channel 4 and reached a peak value of 1.62V. The event lasted 0.39µs.

Figure 6-3 Worst-Case Positive Transient on Run #3 With V_S = ±6V, Gain = 1

Figure 6-4 Worst-Case Negative Transient on Run #3 With V_S = ±6V, Gain = 1

When testing with V_S = ±1.35V, Gain = 10, the worst-case positive transient occurred on channel 3 and reached a peak value of 1.2V. The event lasted 1.44µs. The worst-case negative transient occurred on channel 4 and reached a peak value of 0.72V. The event lasted 1.43µs.

Figure 6-5 Worst-Case Positive Transient on Run #5 With V_S = ±1.35V, Gain = 10

Figure 6-6 Worst-Case Negative Transient on Run #5 With V_S = ±1.35V, Gain = 10

When testing with V_S = ±6V, Gain = 10, the worst-case positive transient occurred on channel 4 and reached a peak value of 2.56V. The event lasted 0.32µs. The worst-case negative transient occurred on channel 1 and reached a peak value of 1.7V. The event lasted 2µs.

Figure 6-7 Worst-Case Positive Transient on Run #6 With V_S = ±6V, Gain = 10

Figure 6-8 Worst-Case Negative Transient on Run #6 With V_S = ±6V, Gain = 10

Figure 6-9 Histogram of the Transient Recovery Time for Each Upset at Supply Voltages of ±1.35V and a Gain of 1

Figure 6-10 Histogram of the Transient Recovery Time for Each Upset at Supply Voltages of ±6V and a Gain of 1

Figure 6-11 Histogram of the Transient Recovery Time for Each Upset at Supply Voltages of ±1.35V and a Gain of 10

Figure 6-12 Histogram of the Transient Recovery Time for Each Upset at Supply Voltages of ±6V and a Gain of 10

Figure 6-13 through Figure 6-28 show the plots of the SET cross section versus LET for the different operating modes used during SET testing for each channel. At low LETs, a very low number of transient events (≤ 2) occurred, resulting in different onsets from channel to channel. This causes the cross section plots to look different for each channel.

Figure 6-13 Weibull Plot: V_S ±1.35V and Gain = 1 - Channel 1

Figure 6-15 Weibull Plot: V_S ±1.35V and Gain = 1 - Channel 3

Figure 6-17 Weibull Plot: V_S ±6V and Gain = 1 - Channel 1

Figure 6-19 Weibull Plot: V_S ±6V and Gain = 1 - Channel 3

Figure 6-21 Weibull Plot: V_S ±1.35V and Gain = 10 - Channel 1

Figure 6-23 Weibull Plot: V_S ±1.35V and Gain = 10 - Channel 3

Figure 6-25 Weibull Plot: V_S ±6V and Gain = 10 - Channel 1

Figure 6-27 Weibull Plot: V_S ±6V and Gain = 10 - Channel 3

Figure 6-14 Weibull Plot: V_S ±1.35V and Gain = 1 - Channel 2

Figure 6-16 Weibull Plot: V_S ±1.35V and Gain = 1 - Channel 4

Figure 6-18 Weibull Plot: V_S ±6V and Gain = 1 - Channel 2

Figure 6-20 Weibull Plot: V_S ±6V and Gain = 1 - Channel 4

Figure 6-22 Weibull Plot: V_S ±1.35V and Gain = 10 - Channel 2

Figure 6-24 Weibull Plot: V_S ±1.35V and Gain = 10 - Channel 4

Figure 6-26 Weibull Plot: V_S ±6V and Gain = 10 - Channel 2

Figure 6-28 Weibull Plot: V_S ±6V and Gain = 10 - Channel 4