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ST1284 Datasheet(PDF) 4 Page - STMicroelectronics |
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ST1284 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 7 page 4/7 ST1284-xxA8/T8 FREQUENCY BEHAVIOR OF DATA AND STROBE SIGNALS TECHNICAL INFORMATION ST1284 SPECTRUM ANALYSER TRACKING GENERATOR Vg Vout Vin 50 Ω 50 Ω +5V Fig. A1: Measurement conditions 1 3 10 30 100 300 1,000 - 30.00 - 25.00 - 20.00 - 15.00 - 10.00 - 5.00 0.00 dB F (MHz) 1284 - 01 1284 - 02 1284 - 03 Fig. A2: Typical frequency response curve for data and strobe signals. In addition to the requirements of termination and EMC compatibility, computing devices are required to be tested for ESD susceptibility. This test is described in the IEC61000-4-2 and is already in place in Europe. This test requires that a device tolerates ESD events and remain operational without user intervention. The ST1284-xxA8/T8 is particularly optimized to perform ESD protection. ESD protection is based on the use of device which clamps at : Vouput V R I BR d PP =+ . This protection function is splitted in 2 stages. As shown in figure A3, the ESD strikes are clamped by the first stage S1 and then its remaining overvoltage is applied to the second stage through the resistor R. Such a configuration makes the voltage very low at the output. ESD PROTECTION ESD Surge Vinput Voutput Rload Rg R S1 Rd V BR V BR V PP Device to be protected ST1284-xxA8/T8 Rd S2 Fig. A3: ST1284 ESD clamping behavior |
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Similar Description - ST1284 |
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