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| NN5198K资料 | |
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NN5198K PDF Download |
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File Size : 116 KB
Manufacturer:MAT Description:Some care must be used in interpreting the numbers in this table. Philips Semiconductors feels strongly that the specifications set forth in a data sheet should reflect as accurately as possible the operation of the part in an actual system. In particular, the input threshold values of VIH and VIL can be tested by the user with parametric test equipment … if VIH and VIL are applied to the inputs, the outputs will be at the voltages guaranteed by the DC Electrical Characteristics table providing that there is adequate grounding and the input voltages are free from noise, otherwise a guardbanded VIH and VIL should be used, i.e., 2.5V instead of 2.0V and 0.5V instead of 0.8V. There is a tendency on the part of some users to use VIH and VIL as conditions applied to the inputs to test the part for functionality in a truth-table exerciser mode. This frequently causes problems because of the noise present at the test head of automated test equipment. Parametric tests, such as those used for the output levels under the VIH and VIL conditions are done fairly slowly, on the order of milliseconds, and any noise present at the inputs has settled out before the outputs are measured. (This is not the case with clocked or enabled parts and poor or moderate fixturing may induce oscillations or severe ground bounce if noise is present.) But in functionality testing, the outputs are examined much faster, before the noise on the inputs is settled out and the part has assumed its final and correct output state. Since these are unloaded outputs, having faster edge rates, this causes more noise, If the outputs are loaded, the 50pF per output pin can cause substantial ground bounce. Thus VIH and VIL should never be used in testing the functionality of any TTL part including FAST. For these types of tests input voltages of +4.5V and 0.0V should be used for the High and Low states respectively. |
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| 1PCS | 100PCS | 1K | 10K | ||
| 价 格 | |||||
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型 号：NN5198K 厂 家：MAT 封 装： 批 号：6003 数 量：200 说 明：Bid Price |
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运 费： 所在地： 新旧程度： |
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| 联系人：刘先生，罗小姐，刘小姐，刘先生，王先生 |
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