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Analog Devices Inc./Maxim Integrated MAX793RCSE+
- Part No.:
- MAX793RCSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793RCSE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,590
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Product details
Overview
MAX793RCSE+ 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 in battery-backed embedded controllers, asserts reset below VRST, gates CE signals with ≤7ns propagation delay, and supports low-line warning via LOWLINE output. Used in portable equipment requiring reliable brownout protection and RAM write protection.
For engineers reviewing the MAX793RCSE+ datasheet, MAX793RCSE+ pinout, MAX793RCSE+ application, or MAX793RCSE+ equivalent, this page delivers verified specifications, validated pin functions, confirmed alternative parts for 3V/3.3V µP supervision, and real-world timing behavior under VCC fall/rise, battery switchover, and watchdog fault conditions.
Technical Context
The MAX793RCSE+ implements a precision voltage comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the reset threshold (VRST = 2.55V–2.70V, falling). Its internal p-channel MOSFET switch enables seamless backup-battery switchover when VCC drops below VSW (2.52V typ), with BATT voltage permitted up to 6.0V - exceeding VCC.
It integrates a 1.6s watchdog timer that clears on any WDI transition and asserts WDO low on timeout; WDO can be connected to MR to generate automatic reset pulses. CE IN-to-CE OUT gating operates with ≤7ns propagation delay and disables during reset to protect CMOS RAM from undervoltage corruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC falling) | 2.55V to 2.70V - guarantees reset assertion before VCC falls below system's 3.0V ±10% supply minimum |
| Battery Switch Threshold (VCC falling) | 2.52V (typ) - triggers switchover from VCC to BATT before reset activates, preserving RAM power |
| Watchdog Timeout | 1.6s - provides deterministic fault detection window for µP software hang recovery |
| CE IN-to-CE OUT Propagation Delay | ≤7ns - ensures minimal latency in chip-enable gating during normal operation |
| RESET Assertion Range | Guaranteed to VCC = 1V - maintains valid reset signal even during deep brownout |
| Supply Current (VCC = 3.3V) | 46µA (typ) - enables ultra-low-power operation in battery-backed systems |
| Operating Temp Range | 0°C to +70°C - qualified for commercial-grade embedded controller environments |
Pinout & Package
MAX793RCSE+ 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 | Switched output connected to VCC or BATT; powers CMOS RAM during main/battery modes |
| VCC (Pin 2) | Main Supply Input | Primary 3.0V/3.3V system supply input; monitored for reset and switchover decisions |
| GND (Pin 6) | Ground Reference | Common return path for all analog and digital circuitry; required for accurate voltage monitoring |
| PFI (Pin 4) | Power-Fail Input | External comparator input; drives PFO low when voltage drops below 1.212V threshold |
| PFO (Pin 7) | Power-Fail Output | Open-drain output signaling imminent power failure; used to enable battery freshness seal |
| MR (Pin 8) | Manual Reset Input | Active-low input with 70µA internal pullup; asserts reset for 200ms after release |
| WDI (Pin 10) | Watchdog Input | Edge-sensitive input; resets 1.6s timer on any transition; detects ≥100ns pulses |
| WDO (Pin 9) | Watchdog Output | Open-drain output low on timeout; connects to MR for automatic fault-triggered reset |
| LOWLINE (Pin 14) | Early Warning Output | Active-low signal asserted when VCC falls to VLR (VRST − 25mV typ); enables NMI for early intervention |
| RESET (Pin 15) | Reset Output | Open-drain, active-low output; guaranteed low for VCC < VRST and during MR assertion |
| RESET (Pin 13) | Active-High Reset Output | Push-pull output inverse of RESET; sources/sinks current without external pullup |
| CE IN (Pin 11) | Chip-Enable Input | Input to CE gating circuit; high-impedance during reset to isolate memory interface |
| CE OUT (Pin 12) | Chip-Enable Output | Gated CE signal; disabled during reset to prevent spurious writes to CMOS RAM |
| BATT (Pin 16) | Backup-Battery Input | Accepts 3.6V lithium battery; voltage may exceed VCC; enables switchover when VCC fails |
| BATT ON (Pin 5) | Battery Status Indicator | Logic-high when OUT is powered from BATT; drives external PMOS/NPN switch for >75mA loads |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Monitoring | Fixed 2.55V–2.70V threshold with 10mV hysteresis ensures stable reset assertion without chatter during brownout |
| Backup-Battery Switchover | Internal p-MOSFET switch automatically transfers OUT from VCC to BATT at 2.52V (typ), supporting 3.6V Li batteries in 3.0V systems |
| Watchdog Timer Integration | 1.6s timeout with edge-triggered WDI input provides deterministic software hang detection without external components |
| Chip-Enable Gating | Sub-7ns CE IN-to-CE OUT propagation and automatic disable during reset prevents corrupted writes to CMOS RAM under undervoltage |
| Low-Line Early Warning | LOWLINE output asserts ~25mV below VRST, enabling NMI-based preemptive shutdown or data save before full reset |
Applications
| Battery-Powered Embedded Controllers | Intelligent Portable Equipment |
|---|---|
Use Scenario: Industrial handheld meter with nonvolatile RAM storing calibration data and real-time clock backup. IC Role / Device Role / Timing Role: MAX793RCSE+ monitors 3.0V main rail, switches RAM supply to 3.6V coin cell upon power loss, and asserts RESET to halt µP before voltage collapse. Use Value: Prevents RAM corruption during field battery swaps and ensures RTC continues running without interruption. | Use Scenario: Medical patient monitor with battery backup, requiring fail-safe data logging during AC power interruption. IC Role / Device Role / Timing Role: MAX793RCSE+ generates LOWLINE interrupt at 2.65V (25mV before reset), triggering immediate flash save; then asserts RESET at 2.55V. Use Value: Enables deterministic 200ms window between early warning and hard reset for critical data preservation. |
| Critical µP Power Monitoring | Portable Data Acquisition Systems |
Use Scenario: Remote environmental sensor node powered by Li-ion with periodic wake-up; must retain state across power cycles. IC Role / Device Role / Timing Role: MAX793RCSE+ guards VCC, gates CE lines to SRAM during brownout, and uses WDI/WDO to detect firmware lockup during sleep/wake transitions. Use Value: Eliminates need for external reset supervisor and discrete watchdog, reducing BOM count and PCB area. | Use Scenario: Handheld oscilloscope with FPGA-based acquisition engine and battery-backed configuration memory. IC Role / Device Role / Timing Role: MAX793RCSE+ asserts RESET within 1µs of VCC crossing 2.55V (falling), while BATT ON drives external PMOS to sustain 150mA RAM load. Use Value: Supports >75mA backup current via external switch, extending operational time beyond internal switch capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCSE+ | Higher reset threshold range: 2.85V–3.00V; identical pinout, package, and feature set | Suitable for 3.3V ±10% supplies where earlier reset assertion is required | Select when system brownout margin requires reset at 2.85V rather than 2.55V |
| MAX793TCSE+ | Reset threshold 3.00V–3.15V; same SO-16 package and supervision features | Optimized for 3.3V ±5% rails with tighter tolerance; not suitable for 3.0V nominal systems | Choose for 3.3V systems needing reset just below nominal supply, e.g., FPGA configuration circuits |
Compared with MAX793SCSE+ and MAX793TCSE+, the MAX793RCSE+ provides the lowest reset threshold (2.55V–2.70V), making it uniquely suited for 3.0V ±10% applications where extended hold-up time before reset is critical - such as battery-powered controllers operating down to 2.7V.
Availability
MAX793RCSE+ is available at Aetrix Electronics and suitable for battery-powered embedded controllers, portable medical devices, and industrial data loggers requiring stable component supply with long-term lifecycle support.
Supply support for MAX793RCSE+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX793 family delivers integrated µP supervision - combining reset generation, battery switchover, watchdog, and CE gating - specifically for space-constrained 3.0V/3.3V embedded systems requiring high reliability and low quiescent current.
FAQ
What is the exact reset threshold voltage range for MAX793RCSE+?
The MAX793RCSE+ has a fixed reset threshold range of 2.55V to 2.70V (VCC falling), specified over temperature and supply voltage. This corresponds to the 'R' suffix in the part number and is optimized for 3.0V ±10% power systems. The threshold includes 10mV typical hysteresis to prevent chatter near the trip point, and the MAX793RCSE+ guarantees reset assertion before VCC falls below 2.55V.
Does MAX793RCSE+ support backup-battery voltage higher than VCC?
Yes, the MAX793RCSE+ explicitly supports backup-battery voltages exceeding VCC - up to 6.0V - enabling direct use of standard 3.6V lithium batteries in 3.0V or 3.3V systems. Its internal p-channel MOSFET switch seamlessly transfers the OUT supply from VCC to BATT when VCC drops below the battery switch threshold (2.52V typical), with no external components required.
How does the watchdog function work in MAX793RCSE+?
The MAX793RCSE+ incorporates a 1.6s watchdog timer that monitors the WDI input. Any rising or falling edge on WDI resets the timer; if no transition occurs within 1.6s, WDO goes low. WDO can be connected to MR to generate an automatic 200ms reset pulse. The watchdog cannot be disabled and remains active whenever VCC > VSW (2.52V), providing continuous firmware health monitoring.
Can MAX793RCSE+ be used to protect CMOS RAM during power failure?
Yes, the MAX793RCSE+ protects CMOS RAM using dual mechanisms: (1) its OUT pin supplies uninterrupted power by switching from VCC to BATT during brownout, and (2) its CE IN-to-CE OUT gating disables during reset to block spurious chip-enable signals. With ≤7ns propagation delay and automatic 10µs holdover when CE IN is low at reset assertion, the MAX793RCSE+ prevents write corruption in undervoltage conditions.
What is the purpose of the LOWLINE output on MAX793RCSE+?
The LOWLINE output on MAX793RCSE+ provides early power-fail warning by asserting low when VCC falls to VLR - defined as VRST minus 25mV (typical). This occurs ~200ms before full reset assertion, enabling the host µP to trigger an NMI and execute critical tasks like saving volatile data or shutting down peripherals gracefully before RESET is activated.
MAX793RCSE+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX793RCSE+ FAQ
1.How can I place an order for MAX793RCSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793RCSE+ 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 MAX793RCSE+ reliable?
The price and inventory of MAX793RCSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793RCSE+ is usually 5 days.
3.What payment methods are accepted for MAX793RCSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793RCSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793RCSE+?
MAX793RCSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793RCSE+ 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 MAX793RCSE+?
For technical support, including MAX793RCSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793RCSE+ requirements.
6.How does Aetrix verify that MAX793RCSE+ is sourced from the original manufacturer or authorized distributors?
All MAX793RCSE+ 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 MAX793RCSE+ meets industry standards.
7.What is the process for return or replacement of MAX793RCSE+?
All MAX793RCSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX793RCSE+, 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 MAX793RCSE+ part is unused and in its original packaging.
Return procedure for MAX793RCSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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