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MAX815CSA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX815CSA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Reset Threshold The MAX814/MAX815 have fixed, factory-set reset thresholds, signified by the first suffix letter in the part number (see Figure 7 for more information on reset ranges). The MAX816 has an adjustable reset threshold. MAX814/MAX815 K-suffix parts have a minimum reset threshold set to 4.75V, worst case. They are intended for 5.0V systems with a ±4% or better power-supply tol- erance design that must meet worst-case system para- meters over time, temperature, line, and load variations. Typically, the reset threshold (VRT) is greater than or equal to the minimum IC operating voltage (VICMIN). The “K” series 1%-tolerance reset threshold allows a larger range of power-supply tolerance. System ICs that have a tight operating supply range, like the 386/486 µPs, need a RESET initiated at a minimum threshold of 4.75V, worst case. L-suffix parts have a minimum reset threshold set to 4.65V, worst case. They are intended for 5.0V systems with a ±5% power-supply tolerance. Typically, the reset threshold is less than or equal to the minimum power- supply voltage, allowing system operation over the complete power-supply range. A reset is initiated at 4.75V maximum. The 1% “L” version maximizes the System IC Guard-Band Range. N-suffix parts have a minimum reset threshold set to 4.50V, worst case. They are intended for 5.0V systems with a ±10% IC system. Typically, the reset threshold ±1% Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits 10 ______________________________________________________________________________________ 4.5 4.75 4.85 5.0 5.25 5.5V IC OPERATING RANGE RESET LIMITS “K” (4.8V ±1%) POWER-SUPPLY RANGE (5.05V ±2%) VRT > VIC(MIN) DESIGNED TO MEET WORST- CASE DESIGN PARAMETERS. 4.5 4.75 4.65 5.0 5.25 5.5V IC OPERATING RANGE RESET LIMITS “L” (4.7V ±1%) POWER-SUPPLY RANGE (5V ±5%) VRT < VPS(MIN) DESIGNED TO ALLOW OPERATION OVER THE FULL POWER-SUPPLY RANGE. 4.5 4.75 4.60 5.0 5.25 5.5V IC OPERATING RANGE RESET LIMITS “N” (4.55V ±1%) POWER-SUPPLY RANGE (5V ±5%) VRT > VIC(MIN) DESIGNED TO MEET WORST- CASE DESIGN PARAMETERS. 3.0 3.06 3.3 3.6V IC OPERATING RANGE RESET LIMITS “T” (3.03V ±1%) POWER-SUPPLY RANGE (3.33V ±0.26%) VRT > VIC(MIN) DESIGNED TO MEET WORST- CASE DESIGN PARAMETERS. Figure 7a. K Suffix Design Range Figure 7b. L Suffix Design Range Figure 7c. N Suffix Design Range Figure 7d. T Suffix Design Range |
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