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Analog Devices Inc./Maxim Integrated MAX693EWE+
- Part No.:
- MAX693EWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693EWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,212
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Product details
Overview
MAX693EWE+ from Maxim Integrated is a microprocessor supervisory circuit designed for critical 5V power monitoring and battery-backed system integrity. It features a 4.4V typical reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and integrated chip-enable gating with ≤10ns propagation delay-enabling reliable CMOS RAM write protection in industrial controllers and intelligent instruments.
For engineers reviewing the MAX693EWE+ datasheet, MAX693EWE+ pinout, MAX693EWE+ application, or MAX693EWE+ equivalent, this device delivers verified power-fail accuracy (±2%), guaranteed RESET assertion down to VCC = 1V, battery switchover with hysteresis, and watchdog timeout configurability via OSC IN/OSC SEL-key selection criteria for embedded systems requiring deterministic reset behavior under brownout or backup transitions.
Technical Context
The MAX693EWE+ implements dual-reset outputs (active-low RESET and active-high RESET), a dedicated LOW LINE comparator output, and independent PFI/PFO for uncommitted power-fail detection. Its internal oscillator supports fixed 1.6s/100ms watchdog periods or external timing via capacitor or clock input on OSC IN.
Chip-enable gating uses a series transmission gate (75Ω–150Ω on-resistance) between CE IN and CE OUT, disabling during reset assertion to prevent spurious memory writes. Battery switchover activates when VCC falls below VBATT − 0.3V and remains asserted until VCC rises above VBATT + 0.3V, with BATT ON providing status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.4V typical (MAX693A variant); ensures reliable reset assertion during 5V rail brownout down to 4.25V min. |
| Reset Timeout Period | 200ms typical on power-up; provides sufficient hold time for μP initialization before release. |
| Supply Current (Operating) | 30μA typical; enables low-power operation in always-on supervisory roles without burdening main supply. |
| CE IN-to-CE OUT Propagation Delay | 6–10ns max; supports high-speed μP bus timing with minimal added latency in CE path. |
| Battery Switchover Hysteresis | 60mV; prevents oscillation during VCC/VBATT crossover near switchover point. |
| Power-Fail Accuracy | ±2% (guaranteed for MAX800M family); enables precise low-battery or early power-loss warning without calibration. |
| VCC-to-VOUT On-Resistance | 0.8–1.6Ω (varies by grade); limits voltage drop to ≤400mV at 250mA load, preserving system rail stability. |
Pinout & Package
MAX693EWE+ is housed in a 16-pin Wide SO (SOIC-W) package with standard 0.3-inch body width and gull-wing leads. Pin 1 is marked with a beveled corner or dot; pin numbering follows counterclockwise convention from top-left when viewing top side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Connects to backup source (capacitor or battery ≥2.0V); enables seamless VOUT switchover when VCC fails. |
| 2 VOUT | Output Supply Voltage | Primary system supply rail output; sourced from VCC or VBATT depending on switchover state; requires 0.1µF decoupling. |
| 3 VCC | Main Supply Input | 5V regulated input (4.5V–5.5V range); powers internal circuitry and feeds VOUT via PMOS switch/diode. |
| 4 GND | Ground Reference | 0V reference for all analog and digital functions; must be low-impedance connection to system ground plane. |
| 5 BATT ON | Battery-On Status Output | Open-drain logic-high indicator when VOUT is sourced from VBATT; sinks 3.2mA at 0.1V saturation. |
| 6 LOW LINE | Reset Comparator Buffer | Active-low buffered output of reset threshold comparator; asserts immediately on VCC drop below 4.4V. |
| 7 OSC IN | Oscillator Timing Input | Accepts external capacitor (for RC timing) or clock signal; sets watchdog/reset timeout periods when OSC SEL = GND. |
| 8 OSC SEL | Oscillator Mode Select | Drives internal oscillator when floating/high; enables external timing when pulled low; has 10µA internal pull-up. |
| 9 PFI | Power-Fail Input | Noninverting input to uncommitted comparator; triggers PFO low when voltage falls below 1.25V ±2%. |
| 10 PFO | Power-Fail Output | Open-drain comparator output; sinks 3.2mA at 0.1V; used for low-battery or early power-loss alerts. |
| 11 WDI | Watchdog Input | Three-level input (high/mid/low); resets watchdog timer on any transition; floating disables watchdog (biased to ~1.6V). |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; goes low only when CE IN is low AND VCC > reset threshold; disabled during reset. |
| 13 CE IN | Chip-Enable Input | High-impedance during reset; presents 75Ω series resistance in enabled mode; connect to μP CE or GND if unused. |
| 14 WDO | Watchdog Output | Active-low watchdog fault indicator; goes low if WDI stalls >1.6s; returns high on next WDI transition. |
| 15 RESET | Active-Low Reset Output | Open-drain output; asserts low on VCC < 4.4V; guaranteed valid down to VCC = 1V; requires external pull-up. |
| 16 RESET | Active-High Reset Output | Open-drain inverse of RESET; high-impedance when RESET is active; used for μPs requiring active-high reset. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior even during deep brownout, eliminating need for external reset extenders. |
| MaxCap®/SuperCap-compatible battery switchover | Supports low-ESR backup capacitors up to 0.47F without external diode or control circuitry. |
| On-board CE signal gating with ≤10ns delay | Prevents erroneous memory writes during power failure while maintaining compatibility with fast μP buses. |
| Configurable watchdog timeout (100ms / 1.6s / external) | Enables flexible firmware supervision strategies-short timeout for safety-critical tasks, long for boot sequences. |
| ±2% power-fail comparator accuracy (MAX800M) | Delivers repeatable low-battery detection without trimming, reducing BOM count and calibration effort. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
|
Use Scenario: PLC maintains real-time I/O state during brief AC line sags or UPS transfer delays. IC Role / Device Role / Timing Role: Supervises 5V logic rail, asserts RESET to halt CPU execution, gates CE to freeze memory writes, and switches VOUT to backup capacitor. Use Value: Prevents corrupted ladder logic execution and preserves volatile configuration data across 200ms power interruptions. |
Use Scenario: Portable ultrasound unit retains calibration settings and patient data during battery swap or low-voltage conditions. IC Role / Device Role / Timing Role: Monitors main 5V supply, triggers PFO-based low-battery alert, asserts RESET to suspend acquisition, and sustains VOUT from backup supercap. Use Value: Enables safe hot-swap of primary battery without data loss or system crash, meeting IEC 62304 power-integrity requirements. |
| Telecom Base Station Management Cards | Automotive Infotainment Head Units |
|
Use Scenario: Remote radio unit management controller survives 100ms grid dropout during lightning-induced surges. IC Role / Device Role / Timing Role: Provides 200ms reset hold time, monitors VCC with ±2% PFI accuracy, and isolates memory access via CE gating during brownout. Use Value: Eliminates false reboots and memory corruption in carrier-grade equipment subjected to EN 61000-4-11 immunity testing. |
Use Scenario: Head unit retains navigation session and Bluetooth pairing after ignition cycle interruption or alternator ripple. IC Role / Device Role / Timing Role: Detects VCC dip below 4.4V, asserts both RESET and RESET outputs, sources VOUT from 3.3V backup rail, and signals BATT ON for firmware logging. Use Value: Achieves seamless resume-from-sleep behavior without requiring full cold boot, improving user experience and reducing EEPROM wear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693AEWE+ | Extended temperature range (−40°C to +85°C) vs. commercial (0°C to +70°C); identical electrical specs and pinout. | Suitable for automotive under-hood or industrial outdoor deployments where ambient exceeds 70°C. | Select MAX693AEWE+ when operating temperature exceeds 70°C; otherwise MAX693EWE+ satisfies standard commercial environments. |
| MAX800MESE+ | Same 4.4V reset threshold and ±2% PFI accuracy, but in 16-pin Narrow SO package (3.9mm width vs. 7.5mm Wide SO). | Preferred for space-constrained PCB layouts where board area is prioritized over thermal mass or hand-soldering ease. | Choose MAX800MESE+ for high-density designs; MAX693EWE+ offers better thermal dissipation and mechanical robustness in Wide SO. |
Compared with MAX693EWE+, MAX693AEWE+ extends environmental reliability without altering functionality, while MAX800MESE+ trades package size for identical supervision performance-making the choice dependent on thermal, spatial, and qualification requirements rather than core capability.
Availability
MAX693EWE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom management cards, and automotive infotainment head units requiring stable component supply across extended production lifecycles.
Supply support for MAX693EWE+ 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 precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX691A/MAX693A/MAX800L/MAX800M family was designed specifically for deterministic power supervision in μP-based systems-delivering guaranteed reset validity, battery switchover, and memory protection without external components.
FAQ
What is the reset threshold voltage of the MAX693EWE+?
The MAX693EWE+ has a typical reset threshold voltage of 4.4V, with a guaranteed range of 4.25V to 4.50V across temperature and supply conditions. This value is specific to the MAX693A/MAX800M variant and differs from the 4.65V threshold of the MAX691A/MAX800L family. The MAX693EWE+ uses this lower threshold to provide earlier reset assertion during marginal 5V rail conditions, ensuring μP stability before deeper brownout occurs.
Does the MAX693EWE+ support battery backup operation?
Yes, the MAX693EWE+ fully supports battery backup operation through its VBATT pin and internal switchover circuitry. When VCC falls below VBATT − 0.3V and the reset threshold, the device automatically connects VOUT to VBATT, sustaining system power. The BATT ON output signals this transition, and VOUT remains valid down to VBATT = 2.0V with ≤150mV drop at 5mA load-enabling reliable operation with coin cells or supercapacitors in the MAX693EWE+ design.
How does the watchdog function work on the MAX693EWE+?
The MAX693EWE+ watchdog monitors the WDI pin for transitions; if no change occurs for longer than the configured timeout (1.6s nominal, adjustable via OSC IN/OSC SEL), it asserts WDO low and triggers RESET/RESET for 200ms. Leaving WDI unconnected disables the watchdog by biasing it to ~1.6V via internal resistors. The MAX693EWE+ watchdog is fully independent of the reset generator and remains functional only when VCC is above the reset threshold-ensuring supervision only during valid operating conditions.
Can the MAX693EWE+ be used with a 3.3V microprocessor?
No-the MAX693EWE+ is specified for 5V operation only, with VCC range 4.5V to 5.5V and reset threshold fixed at 4.4V. Its outputs (RESET, RESET, WDO, PFO, LOW LINE) are open-drain and referenced to VOUT, which tracks VCC or VBATT-neither of which is compatible with 3.3V logic levels without level-shifting. For 3.3V systems, use the MAX6326 or MAX6361 families instead; the MAX693EWE+ is not rated for or characterized in 3.3V applications.
What package type is the MAX693EWE+ supplied in?
The MAX693EWE+ is supplied in a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width, gull-wing leads, and RoHS-compliant lead-free finish (indicated by the "+" suffix). This package offers higher thermal mass and mechanical robustness than Narrow SO, supporting reliable operation in industrial environments. The MAX693EWE+ pinout matches all members of the MAX691A/MAX693A/MAX800L/MAX800M family, enabling direct layout reuse across variants.
MAX693EWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX693EWE+ FAQ
1.How can I place an order for MAX693EWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693EWE+ 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 MAX693EWE+ reliable?
The price and inventory of MAX693EWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693EWE+ is usually 5 days.
3.What payment methods are accepted for MAX693EWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693EWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693EWE+?
MAX693EWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693EWE+ 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 MAX693EWE+?
For technical support, including MAX693EWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693EWE+ requirements.
6.How does Aetrix verify that MAX693EWE+ is sourced from the original manufacturer or authorized distributors?
All MAX693EWE+ 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 MAX693EWE+ meets industry standards.
7.What is the process for return or replacement of MAX693EWE+?
All MAX693EWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX693EWE+, 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 MAX693EWE+ part is unused and in its original packaging.
Return procedure for MAX693EWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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