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MAX6394
High-Accuracy µP Reset Circuit
µP Supervisor Provides the Highest Accuracy at 1%
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Status
Active: In Production.
Description
The MAX6394 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It offers excellent circuit reliability by providing 1% accurate thresholds over temperature and by eliminating external components and adjustments. The MAX6394 also provides a debounced manual reset input.
This device performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is asserted. Active-low RESET remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted. The MAX6394's open-drain active-low RESET output can be pulled up to a voltage higher than VCC.
The MAX6394 comes with factory-trimmed reset threshold voltages from 2.4V to 4.8V. Preset timeout periods of 0.7ms, 14ms, 105ms, and 826ms are also available. The device comes in a SOT143 package.
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Data Sheet
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Key Features
- ±0.6% Threshold Accuracy at TA = +25°C
- ±1.0% Threshold Accuracy from -40°C to +125°C
- Small SOT143 Package
- Open-Drain Active-Low RESET Output Can Exceed VCC
- Precision, Factory-Set VCC Reset Thresholds: Nine Options from 2.4V to 4.8V
- Four Reset Timeout Periods Available: 0.7ms, 14ms, 105ms, and 826ms (minimum)
- Immune to Short VCC Transients
- 5µA Supply Current
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Applications/Uses
- Computers
- Controllers
- Critical µP and µC Power Monitoring
- Intelligent Instruments
- Portable/Battery-Powered Equipment
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Key Specifications:
| Supervisors (1 Monitored Voltage) |
| Part Number |
Reset Thresh.
(V) |
Reset Out |
tRESET |
Watchdog Feature |
Supervisor Features |
Reset Thresh. Accur.
(%) |
ICC
(µA) |
Budgetary Price |
| min |
@ +25°C |
max |
See Notes |
| MAX6394 |
| 1.8 to 2.5 | | 2.5 to 3.3 | | 3.3 to 5.5 |
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| 1ms to 15ms | | 85ms to 300ms | | 300ms to 1s | | <1ms |
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No Watchdog |
Manual Reset |
0.6 |
15 |
$1.60 @1k |
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See All Supervisors (1 Monitored Voltage) (274)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
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Information Index
Document Ref.: 19-3202
Rev 0;
2008-02-12
This page last modified: 2009-10-15
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