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MAX6732UT__D_-T Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6732UT__D_-T Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page Detailed Description Supply Voltages The MAX6730–MAX6735 microprocessor (µP) supervi- sors maintain system integrity by alerting the µP to fault conditions. The MAX6730–MAX6735 monitor one to three supply voltages in µP-based systems and assert an active-low reset output when any monitored supply voltage drops below its preset threshold. The output state remains valid for VCC1 or VCC2 greater than +0.8V. Threshold Levels The two-letter code in the Reset Voltage Threshold Suffix Guide (Table 1) indicates the threshold level combinations for VCC1 and VCC2. Reset Output The MAX6730–MAX6735 feature an active-low reset out- put (RST). RST asserts when the voltage at either VCC1 or VCC2 falls below the voltage threshold level, VRSTIN drops below its threshold, or MR is driven low (Figure 1). RST remains low for the reset timeout period (Table 2) after VCC1, VCC2, and RSTIN increase above their respective thresholds and after MR releases high. Whenever VCC1, VCC2, or RSTIN go below the reset threshold before the end of the reset timeout period, the internal timer restarts. The MAX6730/MAX6732/ MAX6734 provide an open-drain RST output, and the MAX6731/ MAX6733/MAX6735 provide a push-pull RST output. Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output 8 _______________________________________________________________________________________ Table 1. Reset Voltage Threshold Suffix Guide** PART NO. SUFFIX VCC1 NOMINAL VOLTAGE THRESHOLD(V) VCC2 NOMINAL VOLTAGE THRESHOLD (V) LT 4.625 3.075 MS 4.375 2.925 MR 4.375 2.625 TZ 3.075 2.313 SY 2.925 2.188 RY 2.625 2.188 TW 3.075 1.665 SV 2.925 1.575 RV 2.625 1.575 TI 3.075 1.388 SH 2.925 1.313 RH 2.625 1.313 TG 3.075 1.110 SF 2.925 1.050 RF 2.625 1.050 TE 3.075 0.833 SD 2.925 0.788 RD 2.625 0.788 ZW 2.313 1.665 YV 2.188 1.575 ZI 2.313 1.388 YH 2.188 1.313 ZG 2.313 1.110 YF 2.188 1.050 ZE 2.313 0.833 YD 2.188 0.788 WI 1.665 1.388 VH 1.575 1.313 WG 1.665 1.110 VF 1.575 1.050 WE 1.665 0.833 VD 1.575 0.788 ** Standard versions are shown in bold and are available in a D3 timeout option only. Standard versions require 2500-piece order increments and are typically held in sample stock. There is a 10,000-piece order increment on nonstandard versions. Other threshold voltages may be available; contact factory for availability. Table 2. Reset Timeout Period Suffix Guide ACTIVE TIMEOUT PERIOD TIMEOUT PERIOD SUFFIX MIN (ms) MAX (ms) D1 1.1 2.2 D2 8.8 17.6 D3 140 280 D5 280 560 D6 560 1120 D4 1120 2240 |
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