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Analog Devices Inc./Maxim Integrated MAX793SCPE+
- Part No.:
- MAX793SCPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX793SCPE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
MAX793SCPE+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with fixed 2.85V–3.00V reset threshold, backup-battery switchover, active-low reset output, and integrated watchdog timer (1.6s timeout). It monitors VCC in battery-backed embedded systems, asserts reset below threshold, gates CE signals with ≤7ns propagation delay, and supports low-line warning via LOWLINE output - used in portable controllers requiring reliable brownout protection and RAM write protection.
For engineers reviewing the MAX793SCPE+ datasheet, MAX793SCPE+ pinout, MAX793SCPE+ application, or MAX793SCPE+ equivalent, this page delivers verified specifications, validated pin functions, confirmed timing behavior under VCC ramp/fall, and real-world substitution guidance for 3.3V µP supervision in industrial and portable equipment.
Technical Context
The MAX793SCPE+ implements a precision voltage comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the 2.85V–3.00V reset threshold. Its internal p-channel MOSFET switch enables seamless switchover from VCC to VBATT (up to 3.6V) when VCC falls below VSW (2.41V typ), maintaining CMOS RAM power without interruption.
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. The CE IN-to-CE OUT transmission gate operates with <7ns propagation delay and disables during reset to prevent erroneous memory writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V–3.00V (VCC falling); ensures reset assertion before 3.3V supply drops below system tolerance limit |
| Watchdog Timeout | 1.6s ±20%; provides deterministic fault recovery window for µP software hangs |
| Battery Switch Threshold | 2.41V (VCC falling); triggers switchover to backup battery before reset threshold is reached |
| Reset Timeout Period | 200ms minimum; guarantees µP remains held in reset long enough for stable power-up sequence |
| VCC Supply Current | 46µA typ at +25°C; enables ultra-low-power operation in battery-backed standby mode |
| CE Propagation Delay | ≤7ns max; preserves timing integrity of chip-enable signals during normal operation |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded controller applications |
Pinout & Package
MAX793SCPE+ is housed in a 16-pin plastic DIP package (0.300" wide), RoHS-compliant with lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during main or backup operation |
| 2 VCC | Main Supply Input | Primary 3.0V/3.3V power rail monitored for reset and switchover decisions |
| 3 RESET IN | Reset Threshold Input | Not used on MAX793S; reserved (NC) - reset threshold is internally fixed |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage for early power-fail warning; tied to VCC if unused |
| 5 BATT ON | Battery-On Indicator | Active-high open-drain signal indicating BATT is currently powering OUT |
| 6 GND | Ground Reference | Common return path for all analog and digital circuitry |
| 7 PFO | Power-Fail Comparator Output | Open-drain output asserting low when PFI < VPFT or VCC < VSW; enables battery freshness seal |
| 8 MR | Manual Reset Input | Active-low input with 70µA internal pullup; asserts reset for 200ms after rising edge |
| 9 WDO | Watchdog Output | Open-drain output low on watchdog timeout; connects to MR for auto-reset on µP hang |
| 10 WDI | Watchdog Input | Edge-sensitive input; any transition resets 1.6s timer; detects pulses ≥100ns |
| 11 CE IN | Chip-Enable Input | Input to CE gating circuit; high-impedance during reset to isolate memory bus |
| 12 CE OUT | Chip-Enable Output | Gated CE signal passed only when reset inactive; disabled during undervoltage |
| 13 RESET | Active-High Reset Output | Push-pull output sourcing/sinking current; inverse of open-drain RESET pin |
| 14 LOWLINE | Low-Line Warning Output | Active-low comparator output asserting ~15mV below VRST; used for NMI generation |
| 15 RESET | Active-Low Reset Output | Open-drain output requiring external pullup; guaranteed low for VCC < 1V |
| 16 BATT | Backup Battery Input | Accepts up to 3.6V lithium battery; voltage may exceed VCC for extended backup runtime |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Monitoring | Fixed 2.85V–3.00V threshold with 10mV hysteresis prevents chatter during brownout recovery |
| Backup-Battery Switchover | Internal p-MOSFET enables seamless transition to 3.6V battery without interrupting RAM power |
| Watchdog Timer Integration | 1.6s timeout with edge-triggered WDI input provides autonomous µP hang detection |
| Chip-Enable Gating | Sub-7ns CE IN-to-CE OUT propagation delay preserves memory access timing integrity |
| Low-Line Early Warning | LOWLINE output asserts ~15mV below reset threshold, enabling NMI-based pre-failure response |
Applications
| Battery-Powered Portable Controller | Embedded Industrial Data Logger |
|---|---|
|
Use Scenario: Handheld diagnostic tool powered by single 3.6V Li coin cell with 3.3V logic rail. IC Role / Device Role / Timing Role: Supervises VCC, switches RAM supply to battery on main rail collapse, asserts reset before µP executes corrupted code. Use Value: Ensures 100% data retention during unexpected power loss and enables instant resume after battery swap. |
Use Scenario: Remote sensor node logging temperature/humidity to SPI flash with 3.3V supply. IC Role / Device Role / Timing Role: Monitors supply stability, gates CE to flash during brownout, triggers watchdog reset on firmware lockup. Use Value: Prevents flash corruption during voltage sags and recovers autonomously from software faults without host intervention. |
| Intelligent Power Meter Front-End | Critical µP Power Monitoring System |
|
Use Scenario: Utility meter with tamper-detection logic and RTC backed by lithium battery. IC Role / Device Role / Timing Role: Provides BATT OK status, asserts LOWLINE for early warning before reset, maintains RTC power via OUT. Use Value: Guarantees accurate timekeeping and event logging across main power interruptions lasting >10 years. |
Use Scenario: Medical infusion pump requiring fail-safe µP reset on any supply anomaly. IC Role / Device Role / Timing Role: Dual-reset architecture (RESET and RESET) drives redundant safety circuits with guaranteed 200ms hold time. Use Value: Meets IEC 62304 Class C requirements for hardware-initiated safe state entry on undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SEPE+ | Same function and pinout; differs only in package (16-pin SO vs. DIP) | Preferred for surface-mount PCB assembly; identical electrical behavior and thermal profile | Select MAX793SEPE+ for automated SMT production; use MAX793SCPE+ for through-hole prototyping or legacy DIP layouts. |
| TPS3808G33DBVR | Single-supply 3.3V supervisor with 200ms reset timeout; no battery switchover or watchdog | Suitable for cost-sensitive non-battery-backed applications; lacks BATT, WDI/WDO, CE gating | Choose TPS3808G33DBVR only if battery backup, watchdog, and CE control are unnecessary - otherwise MAX793SCPE+ remains functionally superior. |
Compared with MAX793SEPE+, MAX793SCPE+ offers identical supervision functionality in a through-hole package for manual assembly or socketed designs; versus TPS3808G33DBVR, it adds critical battery switchover, watchdog, and CE gating - making it the sole choice for robust, battery-backed µP systems requiring full feature parity.
Availability
MAX793SCPE+ is available at Aetrix Electronics and suitable for battery-powered computers, embedded controllers, and portable equipment requiring stable component supply with long-term lifecycle support.
Supply support for MAX793SCPE+ 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 and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX793 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable 3.0V/3.3V system monitoring with integrated battery backup, watchdog, and memory protection features.
FAQ
What is the exact reset threshold voltage range for MAX793SCPE+?
The MAX793SCPE+ has a fixed reset threshold range of 2.85V to 3.00V (VCC falling), optimized for 3.3V ±10% supplies. This is confirmed in the Selector Guide and Electrical Characteristics table, where "S" suffix denotes this specific threshold band. The device guarantees reset assertion before VCC falls below 2.85V and holds reset until VCC rises above 3.00V, with 10mV hysteresis preventing oscillation.
Does MAX793SCPE+ support backup-battery switchover, and what is the maximum battery voltage?
Yes, MAX793SCPE+ supports backup-battery switchover via its internal p-channel MOSFET. The BATT pin accepts up to 3.6V lithium batteries - explicitly permitted to exceed VCC - ensuring uninterrupted power to CMOS RAM during main supply failure. The switchover occurs at VSW = 2.41V (typ) when VCC falls, and reconnects to VCC when VCC rises above the reset threshold (2.85V–3.00V).
Can MAX793SCPE+ be used without a backup battery?
Yes, MAX793SCPE+ operates fully without a battery: connect BATT to VCC and OUT, and leave PFO unconnected or tied to VCC. In this configuration, it retains all core functions - reset generation, LOWLINE warning, watchdog (if WDI/WDO used), and CE gating - while disabling battery-specific outputs (BATT OK, BATT ON). The datasheet confirms this in the Pin Description and Typical Operating Circuit sections.
What is the function of the CE IN and CE OUT pins on MAX793SCPE+?
CE IN and CE OUT implement a transmission gate that isolates the chip-enable signal to CMOS RAM during undervoltage. When reset is inactive, CE IN passes directly to CE OUT with ≤7ns delay. When reset asserts, the gate disables - holding CE OUT low for 10µs if CE IN was low - preventing spurious writes to RAM during power collapse. This behavior is verified in the Detailed Description and Pin Description sections.
Is the watchdog timer on MAX793SCPE+ programmable or fixed?
The watchdog timer on MAX793SCPE+ has a fixed 1.6s timeout period, as specified in the Electrical Characteristics table under "Watchdog Timeout Period". It cannot be adjusted via external components or configuration bits. The timer clears on any WDI transition (rising or falling edge) and asserts WDO low if no edge occurs within 1.6s - a behavior confirmed across the Watchdog Input and Watchdog Output subsections.
MAX793SCPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX793SCPE+ FAQ
1.How can I place an order for MAX793SCPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793SCPE+ 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 MAX793SCPE+ reliable?
The price and inventory of MAX793SCPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793SCPE+ is usually 5 days.
3.What payment methods are accepted for MAX793SCPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793SCPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793SCPE+?
MAX793SCPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793SCPE+ 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 MAX793SCPE+?
For technical support, including MAX793SCPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793SCPE+ requirements.
6.How does Aetrix verify that MAX793SCPE+ is sourced from the original manufacturer or authorized distributors?
All MAX793SCPE+ 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 MAX793SCPE+ meets industry standards.
7.What is the process for return or replacement of MAX793SCPE+?
All MAX793SCPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX793SCPE+, 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 MAX793SCPE+ part is unused and in its original packaging.
Return procedure for MAX793SCPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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