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MAX6390XS32D2-T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6390XS32D2-T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 11 page a negative-going pulse applied to VCC, starting above the actual reset threshold and ending below it by the magni- tude indicated (reset comparator overdrive). The graph indicates the typical maximum pulse width a negative- going VCC transient may have without causing a reset pulse to be issued. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. A 0.1µF capacitor mounted as close as possible to VCC provides additional transient immunity. Ensuring a Valid RESET Output Down to VCC = 0 The MAX6381–MAX6390 are guaranteed to operate properly down to VCC = 1V. In applications that require valid reset levels down to VCC = 0, a pulldown resistor to active-low outputs (push/pull only, Figure 2) and a pullup resistor to active-high outputs (push/pull only) will ensure that the reset line is valid while the reset output can no longer sink or source current. This scheme does not work with the open-drain outputs of the MAX6383/MAX6386/MAX6389/MAX6390. The resistor value used is not critical, but it must be small enough not to load the reset output when VCC is above the reset threshold. For most applications, 100k Ω is adequate. SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits _______________________________________________________________________________________ 7 MAX6387 MAX6388 MAX6389 RESET IN ( ) IS FOR MAX6388 R1 R2 RESET (RESET) GND VCC VIN MAX6381 MAX6384 MAX6387 VCC R1 100k RESET GND Figure 1. RESET IN Configuration Figure 2. RESET Valid to VCC = Ground Circuit PART RESET THRESHOLD RESET TIMEOUT 46 44 31 29 26 23 22 17 MAX638_ 16 D3 46 44 31 29 26 23 22 17 MAX6390 16 D4 Standard Versions Reset Timeout Delay SUFFIX MIN D1 1ms D2 20ms D3 140ms D5 280ms D6 560ms D4 1120ms D7 1200ms MAX6390XSD4 1120/140ms * MAX6390XSD7 1200/150ms * * The MAX6390 has a 1120ms or 1200ms RESET timeout and a 140ms or 150ms manual reset timeout |
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