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MAX793, MAX793R, MAX793S, MAX793T, MAX794, MAX795, MAX795R, MAX795S, MAX795T
3.0V/3.3V Adjustable Microprocessor Supervisory Circuits
Full-Function Battery-Backup ICs for 3V/3.3V Systems
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Status
| Part Number |
Status |
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MAX793
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Active: In Production. |
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MAX793R
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Active: In Production. |
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MAX793S
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Active: In Production. See Ordering Information for details. |
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MAX793T
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Active: In Production. |
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MAX794
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Active: In Production. |
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MAX795
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Active: In Production. |
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MAX795R
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Active: In Production. |
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MAX795S
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Active: In Production. |
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MAX795T
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Active: In Production. |
Description
The MAX793/MAX794/MAX795 microprocessor (µP) supervisory circuits monitor and control the activities of +3.0V/+3.3V µPs by providing backup-battery switchover, among other features such as low-line indication, µP reset, write protection for CMOS RAM, and a watchdog (see the Selector Guide in the full data sheet). The backup-battery voltage can exceed VCC, permitting the use of 3.6V lithium batteries in systems using 3.0V to 3.3V for VCC.
The MAX793/MAX795 offer a choice of reset threshold voltage range (denoted by suffix letter): 3.00V to 3.15V (T), 2.85V to 3.00V (S), and 2.55V to 2.70V (R). The MAX794's reset threshold is set externally with a resistor divider. The MAX793/MAX794 are available in 16-pin DIP and narrow SO packages, and the MAX795 comes in 8-pin DIP and SO packages.
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Data Sheet
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Key Features
MAX793/MAX794/MAX795
- Precision Supply-Voltage Monitor:
- Fixed Reset Trip Voltage (MAX793/MAX795)
- Adjustable Reset Trip Voltage (MAX794)
- Guaranteed Reset Assertion to VCC = 1V
- Backup-Battery Power Switching—Battery Voltage Can Exceed VCC
- On-Board Gating of Chip-Enable Signals—7ns Max Propagation Delay
MAX793/MAX794 Only
- Battery Freshness Seal
- Battery OK Output (MAX793)
- Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning
- Independent Watchdog Timer (1.6s timeout)
- Manual Reset Input
- Underwriters Laboratories (UL) Recognized
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Applications/Uses
- Battery-Powered Computers/Controllers
- Critical µP Power Monitoring
- Embedded Controllers
- Intelligent Controllers
- Portable Equipment
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Key Specifications:
| Battery Backup Circuits |
| Part Number |
Reset Thresh.
(V) |
Reset Out |
ICC
(µA) |
Features |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max |
max w/pins |
See Notes |
| MAX793 |
2.5 to 3.3 |
| Active High | | Active Low | | Open Drain | | Push-Pull |
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60 |
| Adjustable Reset Input | | Battery On | | Chip Enable Gate | | Low Line | | Manual Reset | | Power Fail Comparator | | Watchdog |
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61.9 |
$3.74 @1k |
| MAX794 |
| 1.2 to 1.8 | | 1.8 to 2.5 | | 2.5 to 3.3 | | 3.3 to 5.5 |
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| Active High | | Active Low | | Open Drain | | Push-Pull |
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60 |
| Adjustable Reset Input | | Battery On | | Chip Enable Gate | | Low Line | | Manual Reset | | Power Fail Comparator | | Watchdog |
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158.4 |
$3.74 @1k |
| MAX795 |
2.5 to 3.3 |
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50 |
| Battery On | | Chip Enable Gate |
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81.9 |
$3.66 @1k |
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See All Battery Backup Circuits (86)
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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
Notes and Comments
MAX794 includes adjustable reset threshold
Didn't Find What You Need?
Information Index
Document Ref.: 19-0366
Rev 6;
2010-03-29
This page last modified: 2011-01-17
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