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MIC2774N-23YM5TR Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC2774N-23YM5TR Datasheet(HTML) 8 Page - Micrel Semiconductor |
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8 / 11 page  Micrel, Inc. MIC2774 March 16, 2015 8 Revision 2.0 the resistors, simply reduce the value of RTOTAL to minimize offset errors. Figure 1. MIC2774 Example Design Interfacing to Processors with Bidirectional Reset Pins Some microprocessors have reset signal pins that are bidirectional, rather than input-only. The Motorola 68HC11 family is one example. Because the MIC2774N’s output is open-drain, it can be connected directly to the processor’s reset pin using only the pull-up resistor normally required. See Figure 2. Figure 2. Interfacing to Bidirectional Reset Pin Transient Response The MIC2774 is inherently immune to very short negative-going glitches. Very brief transients may exceed the voltage thresholds without tripping the output. In general, as shown in Figure 3 and Figure 4, the narrower the transient, the deeper the threshold overdrive that the MIC2774 will ignore. The graphs represent the typical allowable transient duration for a given amount of threshold overdrive that will not generate a reset. Figure 3. Typical Input Transient Response Figure 4. Typical VDD Transient Response Ensuring Proper Operation at Low Supply At VDD levels below 1.2V, the MIC2774’s reset output cannot turn on sufficiently to produce a valid logic-low on /RST. In this situation, circuits driven by /RST could be allowed to float, causing undesired operation. In most cases, however, it is expected that the circuits driven by the MIC2774L will be similarly inoperative at VDD ≤ 1.2V. If a given application requires that /RST be valid below VDD = 1.2V, this can be accomplished by adding a pull- down resistor to the /RST output. A value of 100k Ω is recommended because this is usually an acceptable compromise of quiescent current and pull-down current. The resistor’s value is not critical, however. See Figure 5. |
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