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Analog Devices Inc./Maxim Integrated MAX793SCSE
- Part No.:
- MAX793SCSE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793SCSE.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,064
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Product details
Overview
MAX793SCSE from Maxim Integrated is a 3.3V microprocessor supervisory circuit with fixed reset threshold (2.85V–3.00V), backup-battery switchover, active-low 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 MAX793SCSE datasheet, MAX793SCSE pinout, MAX793SCSE application, or MAX793SCSE equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for 3.3V µP power monitoring and fail-safe operation.
Technical Context
The MAX793SCSE 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 VCC-to-battery switchover when VCC falls below VSW (2.68V typ), supporting 3.6V lithium batteries in 3.3V systems.
It integrates a 1.6s watchdog timer that resets on WDI inactivity, a manual reset input with 70µA internal pullup, and chip-enable gating logic that disables CE OUT during reset-ensuring CMOS RAM write protection during undervoltage events without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V–3.00V (VCC falling); ensures reliable reset before 3.3V supply drops below system tolerance limit |
| Reset Timeout Period | 200ms minimum; guarantees µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s ±25%; provides deterministic fault detection window for µP software hang recovery |
| Battery Switch Threshold | 2.68V (typ); triggers switchover to backup battery before reset assertion, preserving RAM data |
| VCC Supply Current | 46µA (typ) at +25°C; enables low-power operation in battery-critical portable equipment |
| CE IN-to-CE OUT Delay | ≤7ns max; allows use with high-speed µPs without compromising memory access timing |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded controller applications |
Pinout & Package
MAX793SCSE is housed in a 16-pin narrow SO package (SOIC-16, 3.9mm width), RoHS-compliant and available in leaded/lead-free variants. Pin pitch is 0.050", body dimensions are 9.9mm × 3.9mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during normal/battery modes |
| 2 VCC | Main Supply Input | Primary 3.0V/3.3V power rail input; reset asserted when voltage falls below 2.85V |
| 3 RESET IN | Reset Threshold Input | Not used on MAX793SCSE (fixed-threshold variant); left unconnected or tied to VCC |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage; pulls PFO low when input < 1.24V, enabling early power-fail warning |
| 5 BATT ON | Battery-On Indicator | Active-high open-drain output signaling BATT is active; drives external PMOS gate for >75mA loads |
| 6 GND | Ground Reference | Common return path for all analog/digital circuits; must be low-impedance connection |
| 7 PFO | Power-Fail Output | Open-drain output pulled low on PFI under-voltage 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 if WDI inactive >1.6s; connects to MR to trigger automatic watchdog reset |
| 10 WDI | Watchdog Input | Edge-sensitive input; detects ≥100ns pulses; clears watchdog timer on every transition |
| 11 CE IN | Chip-Enable Input | Drives internal transmission gate; high-impedance during reset to isolate memory control path |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; disabled during reset to prevent spurious writes to CMOS RAM |
| 13 RESET | Active-High Reset Output | Push-pull output sourcing/sinking current; inverse of RESET; no external pullup required |
| 14 LOWLINE | Low-Line Warning Output | Active-low comparator output asserting ~15mV below reset threshold; generates NMI for early brownout warning |
| 15 RESET | Active-Low Reset Output | Open-drain output requiring external pullup; guaranteed low for VCC < 1V; holds µP in reset |
| 16 BATT | Backup Battery Input | Accepts up to 6V; battery voltage may exceed VCC; enables RAM retention during main supply loss |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Monitoring | Fixed 2.85V–3.00V trip point with 10mV hysteresis ensures noise-immune, repeatable reset assertion |
| Backup-Battery Switchover | Internal p-MOSFET switch transitions to BATT at 2.68V (typ), supporting 3.6V Li batteries in 3.3V systems |
| Chip-Enable Gating | 7ns max CE IN-to-CE OUT propagation delay prevents erroneous memory writes during undervoltage |
| Integrated Watchdog Timer | 1.6s timeout with edge-triggered WDI input enables autonomous µP hang recovery without firmware changes |
| Low-Line Early Warning | LOWLINE output asserts ~15mV below reset threshold, providing programmable NMI-based brownout alert |
| Battery Freshness Seal | Enables OEM battery preservation by disconnecting BATT until first power-up sequence completes |
Applications
| Battery-Powered Embedded Controller | Intelligent Industrial Sensor Node |
|---|---|
Use Scenario: Portable data logger powered by 3.3V LDO and 3.6V coin cell, operating in remote locations with intermittent charging. IC Role / Device Role / Timing Role: MAX793SCSE monitors VCC, switches RAM supply to battery on dropout, asserts reset to halt µP execution, and gates CE to protect stored calibration data. Use Value: Ensures zero-data-loss RAM retention for >10 years shelf life and reliable restart after extended brownouts. |
Use Scenario: Wireless sensor node with ARM Cortex-M0+ MCU, measuring temperature/pressure in factory automation. IC Role / Device Role / Timing Role: MAX793SCSE provides 200ms reset hold time, 1.6s watchdog supervision, and LOWLINE-triggered NMI for predictive power management. Use Value: Prevents corrupted sensor readings during line sags and enables graceful shutdown before VCC reaches 2.85V. |
| Critical µP Power Monitoring | Portable Medical Diagnostic Device |
Use Scenario: Programmable logic controller (PLC) CPU module requiring fail-safe boot integrity and supply sequencing. IC Role / Device Role / Timing Role: MAX793SCSE acts as primary power supervisor-asserting RESET on VCC dip, disabling CE OUT during reset, and signaling BATT ON for auxiliary power routing. Use Value: Eliminates need for discrete comparators, MOSFET drivers, and RC timers-reducing BOM count by 7 components. |
Use Scenario: Handheld ECG analyzer using 3.3V supply and rechargeable Li-ion battery, requiring FDA-compliant power reliability. IC Role / Device Role / Timing Role: MAX793SCSE monitors main rail, enables battery switchover at 2.68V, asserts RESET to halt measurement cycle, and uses WDO→MR loop for self-recovery from firmware lockup. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-enforced reset and watchdog enforcement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793TCSE | Reset threshold 3.00V–3.15V; higher trip point suited for tighter 3.3V ±5% supplies | Used where system requires reset only after deeper VCC sag (e.g., 3.3V rails with low-noise LDOs) | Select MAX793TCSE when VCC tolerance is ±5% and brownout margin must exceed 3.0V |
| MAX795SCSE | 8-pin SO package; identical electrical specs but reduced pin count-no LOWLINE, BATT OK, or WDI/WDO | Suitable for space-constrained designs needing only reset + battery switchover, no watchdog or early warning | Choose MAX795SCSE when footprint reduction is critical and watchdog/LOWLINE functions are omitted |
Compared with MAX793SCSE, MAX793TCSE offers higher reset immunity for precision 3.3V rails, while MAX795SCSE trades functionality for compactness-making it ideal for cost- and size-sensitive µP supervisors without watchdog or dual-warning capability.
Availability
MAX793SCSE is available at Aetrix Electronics and suitable for battery-powered computers, embedded controllers, and portable medical devices requiring stable component supply across commercial temperature range and long-term lifecycle support.
Supply support for MAX793SCSE 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 management, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX793 family delivers integrated µP supervision-including reset, watchdog, battery switchover, and CE gating-for 3.0V/3.3V systems where reliability, low power, and board space efficiency are critical.
FAQ
What is the exact reset threshold voltage range for MAX793SCSE?
The MAX793SCSE has a fixed reset threshold range of 2.85V to 3.00V (VCC falling), specified at TA = 0°C to +70°C. This S-suffix variant is optimized for 3.3V ±10% power supplies and guarantees reset assertion before VCC falls below 2.85V. The threshold exhibits 10mV typical hysteresis to prevent chatter near the trip point, and the MAX793SCSE does not support external adjustment-unlike the MAX794 series.
Does MAX793SCSE support battery voltage higher than VCC?
Yes, MAX793SCSE supports VBATT up to +6.0V-even when VCC is 3.3V-enabling direct use of standard 3.6V lithium batteries. Its internal p-channel MOSFET switch activates when VCC falls below the battery switchover threshold (2.68V typ), connecting BATT to OUT to maintain CMOS RAM supply. The device guarantees safe operation with VBATT > VCC, and leakage into the battery is limited to 1µA max at worst-case conditions.
How does the watchdog function work on MAX793SCSE?
The MAX793SCSE includes a non-disableable 1.6s watchdog timer monitored via WDI. If WDI remains static (high or low) beyond 1.6s, WDO goes low. A transition on WDI resets the timer. WDO can be connected directly to MR to generate an automatic 200ms reset pulse on timeout. The watchdog operates independently of reset state and remains active whenever VCC > VSW (2.68V), ensuring continuous supervision even during marginal supply conditions.
What is the purpose of the LOWLINE output on MAX793SCSE?
The LOWLINE output on MAX793SCSE is an active-low comparator that asserts ~15mV below the reset threshold (i.e., at ~2.835V for the S-version), providing early warning of imminent power failure. It is designed to drive a non-maskable interrupt (NMI) input on the µP, allowing firmware to execute controlled shutdown, save state, or log diagnostics before reset occurs-enhancing system robustness in brownout scenarios.
Can MAX793SCSE be used without a backup battery?
Yes, MAX793SCSE operates fully without a backup battery. Connect BATT to VCC and leave the battery-related outputs (BATT ON, BATT OK) unused. All core functions-including reset generation, watchdog supervision, CE gating, and LOWLINE warning-remain fully operational. The device draws only 46µA typical from VCC in normal mode, making it suitable for always-on 3.3V systems where battery backup is optional or omitted.
MAX793SCSE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Open Drain or Open Collector
- 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
MAX793SCSE FAQ
1.How can I place an order for MAX793SCSE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793SCSE 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 MAX793SCSE reliable?
The price and inventory of MAX793SCSE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793SCSE is usually 5 days.
3.What payment methods are accepted for MAX793SCSE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793SCSE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793SCSE?
MAX793SCSE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793SCSE 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 MAX793SCSE?
For technical support, including MAX793SCSE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793SCSE requirements.
6.How does Aetrix verify that MAX793SCSE is sourced from the original manufacturer or authorized distributors?
All MAX793SCSE 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 MAX793SCSE meets industry standards.
7.What is the process for return or replacement of MAX793SCSE?
All MAX793SCSE units undergo pre-shipment inspection (PSI). If there is an issue with MAX793SCSE, 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 MAX793SCSE part is unused and in its original packaging.
Return procedure for MAX793SCSE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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