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MAX6343 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6343 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page 6-Pin µP Reset Circuit with Power-Fail Comparator _______________________________________________________________________________________ 5 MAX6344 MAX6342 — 6 Active-High Push-Pull Reset Output. It remains high for 180ms after VCC rises above the reset threshold or MR goes from low to high. 6 — Active-Low Reset Output. Push-pull for MAX6342/MAX6345. Open-drain for MAX6343. It remains low for 180ms after VCC rises above the reset threshold or MR goes from low to high. 5 5 Manual-Reset Input. Pull low to force a reset. RESET or RESET remains active as long as MR is low and for the reset timeout period after MR goes high. Leave unconnected or connect to VCC if unused. Pin Description (continued) MAX6343 — 6 5 MAX6345 6 5 — RESET RESET MR FUNCTION PIN NAME _______________Detailed Description Reset Output A µP’s reset input starts the µP in a known state. These µP supervisory circuits assert reset to prevent code- execution errors during power-up, power-down, or brownout conditions. RESET and RESET are guaranteed to be asserted at a valid logic level for VCC > +1V (see the Electrical Char- acteristics table). Once RESET asserts, it remains asserted for at least 100ms (tRP) after VCC rises above its threshold value or after MR returns high (Figures 1 and 2). Open-Drain RESET Output The MAX6343 has an active-low, open-drain reset out- put. This output sinks current when RESET is asserted. Connect a pull-up resistor from RESET to any positive supply voltage up to +5.5V (Figure 3). Select a resistor value large enough to register a logic low (see the Elec- trical Characteristics table), and small enough to regis- ter a logic high while supplying all input current and leakage paths connected to the RESET line. A 10k Ω pull-up is sufficient in most applications. Manual Reset The MAX6342/MAX6343/MAX6344s’ manual-reset input (MR) allows reset to be triggered by a pushbutton switch. The switch is effectively debounced by the 1µs min reset pulse width. MR is CMOS-logic compatible. RESET GENERATOR VCC 6 (RESET) 5 RESET 4 PFO 1.25V GND 100k Ω VTH ( ) ARE FOR MAX6344 ONLY. 1 MR 2 VCC 3 PFI MAX6342 MAX6343 MAX6344 RESET GENERATOR 6 RESET 5 RESET 4 PFO 1.25V GND VTH 1 2 VCC 3 PFI MAX6345 Figure 1. MAX6342/MAX6343/MAX6344 Functional Diagram Figure 2. MAX6345 Functional Diagram |
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