Latchup Holding Voltage Calculator
Bracket observed latchup holding voltage from actual descending supply/state evidence instead of inventing sub-sample threshold; not a destructive test procedure or chip immunity certification.
Description
A descending latchup sweep can bracket a release threshold between samples.
A descending latchup sweep can bracket a release threshold between samples. Subsample voltage should not be invented.1
Enter aligned nonempty nonnegative strictly decreasing supply voltages and binary latch evidence. Require initial latched evidence followed by a release and no later relatched evidence. Return both witness voltages and their ordered bracket.
When to use Latchup Holding Voltage Calculator
Use Latchup Holding Voltage Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. Censored or ambiguous transitions are input errors. No destructive test procedure or chip-immunity certification is supplied.
Prepare measured device or circuit evidence with matched frequency, temperature, waveform and calibration conditions. Supply explicit caller ratings and limits.
How to use Latchup Holding Voltage Calculator and understand its results
- Prepare measured device or circuit evidence with matched frequency, temperature, waveform and calibration conditions. Supply explicit caller ratings and limits.
- Enter observedDescendingSupplyVoltagesV, latchedStateEvidenceFlags using the field table and calculation rules, then run the tool.
- Read lastObservedLatchedSupplyV, firstObservedReleasedSupplyV, holdingVoltageBracketV. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| observedDescendingSupplyVoltagesV | Observed descending supply voltages v | list of number | Required |
| latchedStateEvidenceFlags | Latched state evidence flags | list of number | Required |
Enter aligned nonempty nonnegative strictly decreasing supply voltages and binary latch evidence. Require initial latched evidence followed by a release and no later relatched evidence. Return both witness voltages and their ordered bracket.
bracket=[firstReleasedVoltage,lastLatchedVoltage] Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| lastObservedLatchedSupplyV | Last observed latched supply v | number |
| firstObservedReleasedSupplyV | First observed released supply v | number |
| holdingVoltageBracketV | Holding voltage bracket v | list of number |
{
"input": {
"observedDescendingSupplyVoltagesV": [
5,
4,
3,
2
],
"latchedStateEvidenceFlags": [
1,
1,
0,
0
]
},
"output": {
"lastObservedLatchedSupplyV": 4,
"firstObservedReleasedSupplyV": 3,
"holdingVoltageBracketV": [
3,
4
]
}
}Limitations and assumptions
Censored or ambiguous transitions are input errors. No destructive test procedure or chip-immunity certification is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Thyristor Holding Current Calculator: A holding-current model stays released after its first drop below threshold. A later current rise does not automatically retrigger the device. For a complementary task, use Hall Sensor Switch Point Calculator: A Hall Schmitt switch keeps state between operate and release thresholds. Initial state therefore matters.
References
-
Latchup Holding Voltage Calculator — tool.io
Similar or alternative tools
- Thyristor Holding Current Calculator
A holding-current model stays released after its first drop below threshold. A later current rise does not automatically retrigger the device.
- Hall Sensor Switch Point Calculator
A Hall Schmitt switch keeps state between operate and release thresholds. Initial state therefore matters.