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Analog Devices Inc./Maxim Integrated MAX793RESE+
- Part No.:
- MAX793RESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793RESE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX793RESE+ from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with fixed reset threshold (2.55V–2.70V), backup-battery switchover, active-low open-drain RESET output, and integrated watchdog timer (1.6s timeout). It monitors VCC supply integrity, asserts reset below threshold, gates CE signals with ≤7ns propagation delay, and supports battery-backed CMOS RAM in portable controllers and embedded systems.
For engineers reviewing the MAX793RESE+ datasheet, MAX793RESE+ pinout, MAX793RESE+ application, or MAX793RESE+ equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery voltage exceeding VCC capability (up to 3.6V), low-line early-warning output (LOWLINE), and BATT OK status monitoring - all critical for reliable power-fail response and data retention in battery-powered µP systems.
Technical Context
The MAX793RESE+ implements a precision voltage comparator with 10mV typical hysteresis on its internal reset threshold (2.55V–2.70V, R-suffix), ensuring stable reset assertion/deassertion during VCC transitions. Its battery switchover logic uses dual comparators: one for VCC-to-BATT switching at VSW ≈ 2.52V (VCC falling) and another for reconnection at VRST (2.55V–2.70V) when VCC rises above VBATT.
It integrates a 1.6s watchdog timer that clears on any WDI transition and drives WDO low on timeout; WDO can be connected to MR to generate automatic reset pulses. The CE IN-to-CE OUT transmission gate operates with <7ns propagation delay and disables during reset to prevent RAM corruption, while maintaining 46Ω series resistance in enabled mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V–2.70V (R-suffix); guarantees reset assertion before VCC drops below 2.55V and prevents false triggers above 2.70V |
| Battery Switch Threshold | 2.52V (VCC falling); initiates switchover from VCC to BATT before reset occurs, preserving RAM power |
| Watchdog Timeout | 1.6s ±25%; ensures µP software liveliness detection without external timing components |
| RESET Propagation Delay | ≤25µs (VCC falling); meets tight timing margins for 3.3V µP reset synchronization |
| VCC Supply Current | 46µA typ (VCC = 3.3V); enables ultra-low-power operation in battery-backed standby mode |
| BATT Leakage Current | 1µA max (VBATT = 1.8V, VCC = 5.5V); minimizes self-discharge of 3.6V lithium backup batteries |
| CE IN-to-CE OUT Delay | ≤7ns; allows safe gating of high-speed chip-enable signals without violating µP timing budgets |
Pinout & Package
MAX793RESE+ is housed in a 16-pin narrow SO package (SOIC-16, 3.9mm width), RoHS-compliant and lead-free (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-channel MOSFET; connects to RAM VDD to maintain data during main supply brownout |
| VCC (Pin 2) | Main supply input | Accepts 2.72V–5.5V; powers internal circuitry and defines reset reference; reset asserted when VCC falls below 2.55V |
| GND (Pin 6) | Ground reference | Common return path for all analog comparators, digital logic, and output drivers |
| PFI (Pin 4) | Power-fail comparator input | Monitors external voltage (e.g., +5V rail); pulls PFO low when PFI < 1.212V, enabling early warning or battery seal activation |
| PFO (Pin 7) | Power-fail comparator output | Open-drain output; goes low on PFI undervoltage or VCC < VSW; used to enable battery freshness seal when pulled low |
| RESET (Pin 15) | Active-low open-drain reset output | Asserts low for ≥200ms on power-up/brownout; requires external pullup; guarantees valid low state down to VCC = 1V |
| RESET (Pin 13) | Active-high reset output | Complementary to RESET; sources/sinks current; drives µP reset directly without pullup |
| MR (Pin 8) | Manual reset input | Active-low; internal 70µA pullup; asserts reset for 200ms after release; compatible with TTL/CMOS switches |
| WDI (Pin 10) | Watchdog input | Edge-sensitive; clears 1.6s timer on any transition; detects pulses ≥100ns wide |
| WDO (Pin 9) | Watchdog output | Open-drain; goes low on watchdog timeout; can be diode-OR'd to MR for automatic fault-induced reset |
| LOWLINE (Pin 14) | Early power-fail warning | Active-low; asserts when VCC falls to VLR (≈2.55V − 25mV); generates NMI for graceful shutdown before reset |
| BATT (Pin 16) | Backup battery input | Accepts 2.3V–6.0V; supports 3.6V lithium cells exceeding VCC; isolated by freshness seal until first power cycle |
| BATT OK (Pin 3) | Battery status indicator | Push-pull output; high only when VBATT > 2.0V and VCC > VSW; provides real-time battery health feedback |
| CE IN (Pin 11) | Chip-enable input | Drives internal transmission gate; high-impedance during reset to block spurious CE activity |
| CE OUT (Pin 12) | Chip-enable output | Passes CE signal only when reset inactive; delays ≤7ns; pulls up to OUT to maintain RAM access during switchover |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset assertion to VCC = 1V | Ensures µP remains held in reset even during deep brownout, preventing code execution errors |
| Backup-battery switchover with VBATT > VCC support | Enables use of standard 3.6V lithium coin cells in 3.0V/3.3V systems without level-shifting or external FETs |
| On-board CE signal gating (≤7ns delay) | Prevents write corruption in battery-backed CMOS RAM during undervoltage events without adding external logic |
| Battery freshness seal | Reduces BATT leakage to ≤1nA during storage; extends shelf life of sealed products with integrated backup power |
| Independent watchdog timer (1.6s timeout) | Provides autonomous software supervision without µP intervention; eliminates need for external watchdog IC |
| Low-line early-warning output (LOWLINE) | Delivers 25mV–60mV advance warning before reset, enabling NMI-driven save-and-shutdown sequences |
Applications
| Battery-Powered Computers and Controllers | Embedded Controllers |
|---|---|
Use Scenario: Portable handheld terminal operating on 3.3V main supply and CR2032 lithium battery. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC monitoring, battery switchover, and RAM write protection during power loss. Use Value: Maintains SRAM contents for ≥10 years on 3.6V battery; LOWLINE triggers NMI 25mV before reset to save session state. | Use Scenario: Industrial PLC module with nonvolatile configuration memory requiring fail-safe power sequencing. IC Role / Device Role / Timing Role: Reset supervisor with manual reset input (MR) and watchdog (WDI/WDO) for firmware crash recovery. Use Value: Guarantees 200ms reset pulse on brownout; 1.6s watchdog forces reboot if firmware hangs, eliminating field service calls. |
| Intelligent Controllers | Critical µP Power Monitoring |
Use Scenario: Smart meter with metrology ASIC and real-time clock backed by coin cell. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.0V supply and validates battery health via BATT OK output. Use Value: BATT OK output asserts high only when VBATT > 2.0V, enabling firmware to disable RTC backup if battery is depleted. | Use Scenario: Medical diagnostic device where µP reset integrity is safety-critical per IEC 62304. IC Role / Device Role / Timing Role: Precision reset generator with 2.55V–2.70V threshold tolerance and guaranteed operation down to VCC = 1V. Use Value: Meets Class C software safety requirements by eliminating reset ambiguity during gradual supply collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SESE+ | Higher reset threshold (2.85V–3.00V); 2.925V typical vs. 2.625V for MAX793RESE+ | Suitable for 3.3V ±10% supplies; less margin for low-VCC brownout detection | Select when system VCC nominal is 3.3V with wider tolerance; avoid if brownout must trigger earlier than 2.85V |
| MAX793TESE+ | Reset threshold 3.00V–3.15V; 3.075V typical; higher hysteresis (15mV) | Optimized for 3.3V ±5% rails; asserts reset later, reducing false triggers on ripple | Choose for noise-prone 3.3V systems where 3.0V minimum VCC is acceptable; not for low-voltage operation |
Compared with MAX793SESE+ and MAX793TESE+, the MAX793RESE+ provides earliest reset assertion (2.55V min), making it optimal for 3.0V systems or designs requiring maximum brownout warning time before data loss - critical for battery-backed RAM retention and safety-critical power sequencing.
Availability
MAX793RESE+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, intelligent controllers, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX793RESE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX793 family is designed as a precision 3.0V/3.3V microprocessor supervisory platform, integrating reset generation, battery switchover, watchdog, and CE gating to ensure data integrity and system reliability in portable and embedded µP applications.
FAQ
What is the exact reset threshold voltage range for MAX793RESE+?
The MAX793RESE+ has a fixed reset threshold range of 2.55V to 2.70V (R-suffix), with typical value 2.625V at +25°C. This range is specified for VCC falling conditions and includes 10mV typical hysteresis to prevent oscillation during threshold crossing. The device guarantees reset assertion before VCC drops below 2.55V and holds reset until VCC rises above 2.70V.
Does MAX793RESE+ support backup batteries with voltage higher than VCC?
Yes, MAX793RESE+ supports backup batteries up to 6.0V, explicitly permitting 3.6V lithium cells in 3.0V/3.3V systems. Its internal VCC-to-BATT switchover circuit activates when VCC falls below 2.52V (VCC falling), connecting BATT to OUT without level-shifting. The BATT OK output also validates battery health independently of VCC level.
How does the battery freshness seal function on MAX793RESE+?
The battery freshness seal on MAX793RESE+ disconnects the BATT pin from internal circuitry until first power-up. To enable it: connect battery to BATT, ground PFO, bring VCC above 2.70V, wait for reset timeout (200ms), then cycle VCC low. Once enabled, leakage drops to ≤1nA. The seal remains active until VCC next exceeds the reset threshold, preserving battery shelf life.
Can MAX793RESE+ drive CMOS RAM directly during battery backup?
Yes, MAX793RESE+ drives CMOS RAM directly via its OUT pin, which switches between VCC and BATT using an internal p-channel MOSFET. In battery-backup mode (VCC < 2.52V), OUT connects to BATT with ≤140Ω on-resistance at +25°C, supporting typical RAM standby currents (<1µA). No external FET or diode is required for basic retention.
What is the watchdog timeout period for MAX793RESE+ and how is it triggered?
The MAX793RESE+ watchdog timeout period is 1.6 seconds ±25%. It is triggered when the WDI input remains static (high or low) beyond this interval. Any edge (low-to-high or high-to-low) on WDI resets the timer. WDO goes low on timeout and returns high on the next WDI transition. The watchdog cannot be disabled and operates independently of reset state when VCC > VSW.
MAX793RESE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX793RESE+ FAQ
1.How can I place an order for MAX793RESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793RESE+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX793RESE+ reliable?
The price and inventory of MAX793RESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793RESE+ is usually 5 days.
3.What payment methods are accepted for MAX793RESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793RESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793RESE+?
MAX793RESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793RESE+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX793RESE+?
For technical support, including MAX793RESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793RESE+ requirements.
6.How does Aetrix verify that MAX793RESE+ is sourced from the original manufacturer or authorized distributors?
All MAX793RESE+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX793RESE+ meets industry standards.
7.What is the process for return or replacement of MAX793RESE+?
All MAX793RESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX793RESE+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX793RESE+ part is unused and in its original packaging.
Return procedure for MAX793RESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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