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MAX6744：Low-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits

Low-Power, Dual-/Triple-Voltage SC70 µP Supervisory Circuits are Ideal for Portable Equipment

The MAX6736–MAX6745 are low-power dual-/triple-voltage microprocessor (µP) supervisors. These devices assert a reset if any monitored supply falls below its factory-trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly reduce size and power compared to separate ICs or discrete components. The low supply current of 6µA makes these devices ideal for portable equipment. The MAX6736/MAX6737 are dual fixed-voltage µP supervisors with a manual reset input. The MAX6738/MAX6739 have one fixed and one adjustable reset threshold and a manual reset input. The MAX6740/MAX6743 are triple-voltage µP supervisors with two fixed and one user-adjustable reset threshold inputs. The MAX6741/MAX6744 are dual-voltage µP supervisors with a power-OK (POK) output ideal for power-supply sequencing. The MAX6742/MAX6745 monitor the primary VCC supply and have an independent power-fail comparator. The MAX6736–MAX6745 monitor I/O supply voltages (VCC1) from 1.8V to 5.0V and core supply voltages (VCC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (Table 1). An external adjustable RSTIN input option allows monitoring voltages down to 0.5V. A variety of push-pull or open-drain reset outputs along with manual reset input and power-fail input/output features are available (see the Selector Guide). The MAX6736–MAX6745 are offered in a space-saving 5-pin SC70 package and operate over the -40°C to +85°C temperature range.

Key Features Dual-/Triple-Supply Reset Voltage Monitors Precision Factory-Set Reset Thresholds for Monitoring from 0.9V to 5.0V Adjustable Reset Input Down to 0.488V 150ms and 1200ms (min) Reset Timeout Period Options VCC1 Power-OK Output for Power-Supply Sequencing Applications (MAX6741/MAX6744) Power-Fail Input/Power-Fail Output (MAX6742/MAX6745) 6µA Supply Current Tiny SC70 Package

MAX6736, MAX6737, MAX6738, MAX6739, MAX6740, MAX6741, MAX6742, MAX6743, MAX6744, MAX6745: Functional Diagram Applications/Uses Controllers GPS Equipment Multivoltage Systems Notebook Computers PDAs Portable Battery-Powered Equipment POS Equipment

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