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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 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:926
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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, watchdog timer (1.6s timeout), and chip-enable gating-designed for battery-backed CMOS RAM protection in embedded controllers and portable equipment.
For engineers reviewing the MAX793SCSE+ datasheet, MAX793SCSE+ pinout, MAX793SCSE+ application, or MAX793SCSE+ equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in critical power monitoring, and confirmed alternative parts for design continuity and supply resilience.
Technical Context
The MAX793SCSE+ integrates a precision voltage monitor with hysteresis, a 1.6s watchdog timer that clears on WDI transitions, and a bidirectional VCC/BATT switchover switch with <15mV typical hysteresis to prevent oscillation during brownout recovery. Its CE IN-to-CE OUT path features 7ns max propagation delay and automatic disable during reset assertion.
It provides dual reset outputs (open-drain RESET and push-pull RESET), active-low LOWLINE warning at 2.925V (VCC falling), and BATT OK status monitoring (2.0V min threshold) - all operating across 0°C to +70°C with guaranteed reset assertion down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V–3.00V (S-suffix), fixed and factory-trimmed for 3.3V ±10% supplies |
| Watchdog Timeout | 1.6s nominal; resets on any WDI edge, cannot be disabled |
| Battery Switch Threshold | VSW = 2.68V (VCC falling); enables seamless switchover to 3.6V lithium battery |
| CE Propagation Delay | ≤7ns max; ensures reliable gating of chip-enable signals during undervoltage |
| Supply Current (VCC) | 46µA typ @ 3.3V, 25°C; ultra-low for battery-backed operation |
| Reset Timeout Period | 200ms min; guarantees stable µP initialization after power-up or brownout |
| BATT OK Threshold | 2.00V min; continuously monitors backup battery health while VCC > VSW |
Pinout & Package
MAX793SCSE+ is housed in a 16-pin narrow SO package (SOIC-16, 150mil width), RoHS-compliant and lead-free (+ suffix). Pin functions are electrically validated per Maxim's official datasheet revision 6 (19-0366).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-MOSFET; supports up to 75mA load |
| 2 VCC | Main supply input | Accepts 2.72V–5.5V; reset asserted when VCC falls below 2.85V (S-version) |
| 3 RESET IN | Reset threshold input | Not used on MAX793; reserved (NC) - MAX794 only uses this pin |
| 4 PFI | Power-fail comparator input | Triggers PFO low when voltage drops below 1.240V; connect to VCC if unused |
| 5 BATT ON | Battery-switch status output | Active-high signal indicating OUT is sourced from BATT (enables external PMOS driver) |
| 6 GND | Ground reference | Common return for VCC, BATT, and all logic/monitoring circuits |
| 7 PFO | Power-fail comparator output | Open-drain; goes low on PFI < 1.240V or VCC < VSW; enables battery freshness seal |
| 8 MR | Manual reset input | Active-low with 70µA internal pullup; asserts 200ms reset pulse on logic-low transition |
| 9 WDO | Watchdog output | Push-pull; goes low if WDI remains static >1.6s; connects to MR for auto-reset on fault |
| 10 WDI | Watchdog input | Edge-sensitive; detects pulses ≥100ns; timer clears on every transition |
| 11 CE IN | Chip-enable input | Drives internal transmission gate; high-impedance during reset to block spurious writes |
| 12 CE OUT | Chip-enable output | Gated version of CE IN; disabled during reset to protect CMOS RAM during brownout |
| 13 RESET | Active-high reset output | Push-pull; complements open-drain RESET; sources/sinks current without external pullup |
| 14 LOWLINE | Early power-fail warning | Active-low; asserts at VCC = 2.925V (falling), enabling NMI for graceful shutdown |
| 15 RESET | Active-low reset output | Open-drain; requires external pullup (4.7kΩ–1MΩ); guaranteed low down to VCC = 1V |
| 16 BATT | Backup battery input | Accepts up to 6.0V; supports 3.6V lithium cells exceeding VCC; leakage <1µA when sealed |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 2.85V–3.00V threshold with ±15mV tolerance over temperature, enabling robust 3.3V system supervision |
| Backup-battery switchover | Automatic VCC-to-BATT transfer at 2.68V (VCC falling); supports VBATT > VCC (e.g., 3.6V Li) without external FET |
| Watchdog timer | 1.6s timeout with edge-triggered WDI; no disable option ensures fail-safe µP supervision |
| Chip-enable gating | 7ns max CE IN-to-CE OUT delay; disables write path to CMOS RAM during reset, preventing data corruption |
| Battery freshness seal | Enables OEM battery preservation by disconnecting BATT until first power cycle; activated via PFO grounding sequence |
| Low-line early warning | LOWLINE output asserts 15mV before reset threshold (2.925V), providing time for NMI-driven save-and-shutdown |
Applications
| Battery-Powered Embedded Controller | Intelligent Portable Instrument |
|---|---|
|
Use Scenario: Handheld data logger with nonvolatile RAM and lithium coin-cell backup. IC Role / Device Role / Timing Role: Supervises 3.3V main rail, switches RAM supply to 3.6V battery during power loss, and asserts LOWLINE 15mV pre-reset for firmware save. Use Value: Prevents RAM corruption during brownout and extends operational uptime using sealed battery until first use. |
Use Scenario: Portable medical sensor with real-time µP control and battery-backed configuration storage. IC Role / Device Role / Timing Role: Monitors VCC for 3.3V ±10% compliance, triggers 200ms reset on dropout, and gates CE to halt memory writes during undervoltage. Use Value: Ensures deterministic boot state and eliminates spurious writes to flash/RAM during unstable power conditions. |
| Critical µP Power Monitoring | Industrial Controller with RAM Backup |
|
Use Scenario: PLC module requiring guaranteed reset assertion even at VCC = 1V. IC Role / Device Role / Timing Role: Provides open-drain RESET output valid down to 1V VCC, plus push-pull RESET for direct µP interface without pullup. Use Value: Meets IEC 61000-4-29 immunity requirements for sustained undervoltage operation and safe restart. |
Use Scenario: Factory automation controller with CMOS SRAM retaining calibration data during AC mains failure. IC Role / Device Role / Timing Role: Uses BATT OK output to verify 2.0V+ battery health before switchover, and BATT ON to drive external PMOS for >75mA backup loads. Use Value: Eliminates need for discrete battery monitoring circuitry and supports high-current RAM backup without layout redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793TCSE+ | Higher reset threshold (3.00V–3.15V); optimized for 3.3V ±5% systems | Less margin for 3.3V supplies with wide tolerance; unsuitable where brownout occurs near 3.0V | Select MAX793SCSE+ for 3.3V ±10% rails; choose MAX793TCSE+ only if tighter VCC regulation is guaranteed. |
| MAX795SCSE+ | 8-pin SO package; identical S-threshold and core functions but no LOWLINE or BATT OK outputs | Lacks early power-fail warning and battery status indication; reduced feature set for space-constrained designs | Use MAX795SCSE+ only when board area is critical and LOWLINE/BATT OK are not required. |
Compared with MAX793TCSE+, MAX793SCSE+ offers wider reset hysteresis margin for noisy 3.3V rails; compared with MAX795SCSE+, it retains full diagnostic capability (LOWLINE, BATT OK) in a 16-pin footprint for robust industrial monitoring.
Availability
MAX793SCSE+ is available at Aetrix Electronics and suitable for battery-powered embedded controllers, intelligent portable instruments, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX793 family is designed specifically for 3.0V/3.3V microprocessor supervision - delivering integrated reset, watchdog, battery switchover, and memory protection in single-chip solutions for space- and power-constrained systems.
FAQ
What is the reset threshold voltage range for MAX793SCSE+?
The MAX793SCSE+ has a fixed reset threshold range of 2.85V to 3.00V (S-suffix), specified for 3.3V ±10% power supplies. It guarantees reset assertion before VCC falls below 2.85V and prevents false triggering above 3.00V under normal operation. This range is factory-trimmed and does not require external resistor programming - unlike the MAX794.
Does MAX793SCSE+ support backup battery voltages higher than VCC?
Yes, MAX793SCSE+ supports VBATT up to 6.0V - enabling use of standard 3.6V lithium batteries even when VCC is 3.3V or lower. The internal p-channel MOSFET switch automatically transfers OUT from VCC to BATT when VCC falls below 2.68V (VCC falling), and reconnects to VCC when VCC rises above the reset threshold (2.85V–3.00V).
Can MAX793SCSE+ be used without a backup battery?
Yes, MAX793SCSE+ operates fully without a battery: connect BATT to VCC and leave PFO unconnected or tied to VCC. All supervision functions - reset generation, watchdog, LOWLINE, and CE gating - remain active. The BATT OK and BATT ON outputs are disabled, and battery-related leakage (<1µA) is eliminated, preserving system efficiency.
What is the purpose of the LOWLINE output on MAX793SCSE+?
The LOWLINE output on MAX793SCSE+ is an active-low early warning signal that asserts at VCC = 2.925V (15mV above the 2.85V reset threshold) during power-down. It enables non-maskable interrupt (NMI) generation for firmware-initiated data save, configuration backup, or controlled shutdown - providing critical time before hard reset occurs.
How does the manual reset (MR) input behave on MAX793SCSE+?
The MR input on MAX793SCSE+ is active-low with a 70µA internal pullup. A logic-low pulse ≥100ns asserts RESET for 200ms after MR returns high. During the first 100ms of reset timeout, MR is ignored if PFO is externally held low (battery freshness seal mode). MR can be driven directly from TTL/CMOS logic or a momentary switch to GND - no external debounce required.
MAX793SCSE+ 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:
- 2.925V
- 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:
- 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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