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MIC2772-S3S3BML Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC2772-S3S3BML Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 9 page Micrel MIC2772 Transients on VCC The MIC2772 is inherently immune to very short “glitches” on VCC. In the case of very brief transients, VCC may drop below the reset-voltage threshold without triggering a reset. As shown in the graph, the MIC2772 is relatively immune to transients with typical duration of 25us. The lines on the graph represent the typical allowable transient duration for a given amount of threshold overdrive that will not generate a reset. The data was taken by adding negative-going square-wave pulse to a DC input voltage set at 0.5V above actual measured threshold for the part being characterized. Figure 1 shows the graph for the MIC2772[UP3] and Figure 2 shows the graph for the MIC2772[UP5] 0 5 10 15 20 25 30 35 0 200 400 600 800 1000 RESET COMP. OVERDRIVE VTH - VCC (mV) Typical Transient Response V TH = 4.393V Figure 1 0 5 10 15 20 25 30 35 40 0 200 400 600 800 1000 RESET COMP. OVERDRIVE VTH - VCC (mV) Typical Transient Response V TH = 2.933V Figure 2 Interfacing to Processors with Bi-directional Reset Pins Some microprocessors have reset signal pins that are bi-directional, rather than input only. The Motorola 68HC11 family is one example. Because the MIC2772’s output is active-low, open-drain, it can be connected directly to the processor’s reset pin with only the pull-up resistor normally required. MIC2772 Replaces Single Supervisor The table below lists common single voltage supervisors that can be considered for replacement by MIC2772. P/N Suffix Supervisor #1 Supervisor #2 L2L3 MIC6315-46D2 MIC1810-5, MIC6315-46D3, MIC809L, MIC811L M2M3 MIC6315-44D2 MIC1810-10, MIC6315-44D3, MIC809M, MIC811M L3L3 MIC1810-5, MIC6315-46D3, MIC809L, MIC811L MIC1810-5, MIC6315-46D3, MIC809L, MIC811L M3M3 MIC1810-10, MIC6315-44D3, MIC809M, MIC811M MIC1810-10, MIC6315-44D3, MIC809M, MIC811M T3T3 MIC6315-31D3, MIC809T, MIC811T MIC6315-31D3, MIC809T, MIC811T S3S3 MIC1815-10, MIC6315-29D3, MIC809S, MIC811S MIC1815-10, MIC6315-29D3, MIC809S, MIC811S T2T3 MIC6315-31D2 MIC6315-31D3, MIC809T, MIC811T S2S3 MIC6315-29D2 MIC1815-10, MIC6315-29D3, MIC809S, MIC811S L3T3 MIC1810-5, MIC6315-46D3, MIC809L, MIC811L MIC6315-31D3, MIC809T, MIC811T M3S3 MIC1810-10, MIC6315-44D3, MIC809M, MIC811M MIC1815-10, MIC6315-29D3, MIC809S, MIC811S April 2005 7 M9999-042605 (408) 955-1690 |
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