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データシートサーチシステム |
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データシートサーチシステム |
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STR720 データシート(PDF) 386 Page - STMicroelectronics |
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STR720 データシート(HTML) 386 Page - STMicroelectronics |
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386 / 401 page  STR720 - ELECTRICAL CHARACTERISTICS 386/401 interface timing characteristics, see Section 28.12: External Memory Bus Timing on page 393 1. VDD(all) = 1.80 V ± 10%, VDD3(all) = 3.30 V ± 10%, TA = -40 / +85 °C unless otherwise specified. 2. Data based on design guidelines and validation, not tested in production. 28.9 Asynchronous Reset Input Characteristics All reset input pins implement a low-pass glitch filter which improves their noise immunity and prevents system from malfunctioning as it would happen if they got activated inappropriately. The electrical characteristics of these special pins, both static and dynamic, are reported in Table 101. It must be noted that input characteristics of RSTIN ad RTCRST are different from standard I/Os, due to the fact that they are supplied at 1.8 V by VDDRTC and they have to tolerate 3.3 V input signals even when no such voltage is applied to STR720 device (STANDBY mode). 1. VDD(all) = 1.80 V ± 10%, VDD3(all) = 3.30 V ± 10%, TA = -40 / +85 °C unless otherwise specified. Table 100. AC Electrical Characteristics Symbol Parameter Test Conditions(1) Value Unit Min. Typ Max TTR Output transition time (10%-90% and 90%-10%) P2(15:0), P3(12:0), P4(3:0)(2) CL = 50pF - - 5 ns Output transition time (10%-90% and 90%-10%) P4(4),P7(43:0), JTDO, JTCK(2) CL = 50pF - - 2.5 ns Output transition time (10%-90% and 90%-10%) P6(59:47,45:0)(2) CL = 30pF - - 1 ns Table 101. Reset pads input filter characteristics Symbol Parameter Test Conditions(1) Value Unit Min Typ Max VIL Input low level TTL Schmitt trigger (JTRST) -- 0.8 V Input low level Schmitt trigger (RSTIN, RTCRST) 0.43 0.5 0.65 V VIH Input high level TTL Schmitt trigger (JTRST) 2.0 - - V Input high level Schmitt trigger (RSTIN, RTCRST) 0.72 0.9 0.98 V VHYS Input hysteresis TTL Schmitt trigger (JTRST) 0.4 - - V Input hysteresis Schmitt trig- ger (RSTIN, RTCRST) -- - V tFRS Input filtered pulse JTRST, RSTIN, RTCRST - - 50 ns tNFR Input not filtered pulse JTRST, RSTIN, RTCRST 500 - - ns |
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