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Analog Devices Inc./Maxim Integrated MAX693AEWE+T
- Part No.:
- MAX693AEWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693AEWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
MAX693AEWE+T from Maxim Integrated is a microprocessor supervisory circuit with 4.4V reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and integrated chip-enable gating. It monitors VCC for brownout detection, asserts active-low RESET during undervoltage, and supports battery switchover down to VBATT = 2.0V - used in industrial controllers requiring reliable power sequencing and watchdog protection.
For engineers reviewing the MAX693AEWE+T datasheet, MAX693AEWE+T pinout, MAX693AEWE+T application, or MAX693AEWE+T equivalent, this page delivers verified functional identity, validated pin roles, confirmed timing parameters (reset delay, watchdog timeout), real-world backup-battery behavior, and precise alternative part comparisons - all traceable to Maxim's official documentation.
Technical Context
The MAX693AEWE+T implements dual-reset logic (RESET and RESET) with independent open-drain outputs, a dedicated watchdog timer with selectable 100ms/1.6s timeout periods via OSC SEL/OSC IN, and a precision voltage comparator for power-fail warning (PFI/PFO). Its internal PMOS VCC-to-VOUT switch exhibits ≤1.4Ω on-resistance at +25°C.
Battery switchover activates when VCC falls below VBATT − 0.3V (power-down) or rises above VBATT + 0.3V (power-up), with 60mV hysteresis. CE IN-to-CE OUT propagation delay is guaranteed ≤10ns under 50Ω source / 50pF load conditions, enabling compatibility with high-speed μP bus timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.40V typical - ensures reliable μP reset assertion before 5V rail collapse into brownout region |
| Power-Up Reset Timeout | 200ms typical - provides sufficient hold time for μP initialization and peripheral stabilization |
| Supply Current (Operating) | 30μA typical - enables low-power operation in always-on monitoring applications |
| VCC-to-VOUT On-Resistance | ≤1.4Ω - minimizes dropout under 250mA load, preserving system supply margin |
| Watchdog Timeout (Long) | 1.6s nominal - balances fault detection responsiveness with software execution tolerance |
| CE Propagation Delay | ≤10ns - supports CE gating without violating timing budgets of fast μPs (e.g., ARM Cortex-M4) |
| RESET Validity Range | Down to VCC = 1V - guarantees reset assertion integrity even during deep brownout |
Pinout & Package
MAX693AEWE+T is housed in a 16-pin Wide SO (SOIC-W) package with 1.27mm pitch, JEDEC MS-013AC compliant, RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-backup input | Connects to backup capacitor or Li-ion cell; enables seamless switchover when VCC drops below VBATT − 0.3V |
| 2 VOUT | Regulated output supply | Delivers system power from VCC or VBATT; decoupled with 0.1µF capacitor to GND |
| 3 VCC | Main 5V supply input | Accepts +4.5V to +5.5V; powers internal circuitry and drives VOUT via PMOS switch |
| 4 GND | Ground reference | 0V return path for all analog/digital functions; must be low-impedance connection |
| 5 BATT ON | Battery-active indicator | Open-drain output pulled high in battery mode; used to drive external PNP base or status LED |
| 6 LOW LINE | Reset comparator buffered output | Active-low signal tracking VCC vs. 4.4V threshold; sinks 3.2mA at 0.1V saturation |
| 7 OSC IN | External oscillator timing input | Accepts capacitor (for RC oscillator) or clock signal; sets reset/watchdog timeout periods |
| 8 OSC SEL | Oscillator mode select | Logic-high = internal oscillator (1.6s/200ms); logic-low = external timing control |
| 9 PFI | Power-fail comparator input | Non-inverting input referenced to 1.25V; detects supply sag or low-battery condition |
| 10 PFO | Power-fail comparator output | Active-low open-drain output; asserts when PFI < 1.25V; ±2% accuracy over temperature |
| 11 WDI | Watchdog input | Three-level input; transition resets timer; floating = watchdog disabled (biased to 1.6V) |
| 12 CE OUT | Chip-enable gated output | Passes CE IN only when VCC > reset threshold; prevents RAM corruption during power failure |
| 13 CE IN | Chip-enable gated input | High-impedance during reset; series 75Ω resistance in enabled mode |
| 14 WDO | Watchdog output | Active-low open-drain; mirrors RESET assertion during watchdog timeout; TTL-compatible |
| 15 RESET | Active-low reset output | Open-drain; sinks 3.2mA at 0.1V; asserted for 200ms after VCC crosses 4.4V on power-up |
| 16 RESET | Active-high reset output | Open-drain inverse of RESET; high-impedance when inactive; requires external pullup |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = +1V | Ensures deterministic reset behavior during severe brownout, eliminating undefined μP states |
| On-board CE signal gating with ≤10ns delay | Prevents spurious writes to CMOS RAM during power transitions without external logic |
| MaxCap®/SuperCap-compatible battery switchover | Supports low-ESR backup capacitors up to 0.47F without external diode or FET |
| ±2% power-fail accuracy (MAX800L/M variant) | Enables precise low-battery warning at 2.8V ±56mV, critical for portable medical devices |
| Dual watchdog timeout selection (100ms / 1.6s) | Allows optimization for fast-recovery systems (e.g., motor control) or latency-tolerant firmware |
Applications
| Industrial Controller Power Monitoring | Embedded Data Logger with Backup Memory |
|---|---|
|
Use Scenario: PLC mainboard monitors 5V rail during factory floor voltage sags. IC Role / Device Role / Timing Role: Supervisory IC asserts RESET before VCC drops below μP minimum operating voltage; holds reset for 200ms post-recovery. Use Value: Prevents corrupted ladder logic execution and I/O state mismatches during transient brownouts. |
Use Scenario: Battery-backed data logger retains timestamped sensor readings during AC power loss. IC Role / Device Role / Timing Role: Switches VOUT from VCC to VBATT within 60mV hysteresis; asserts BATT ON to enable backup power path. Use Value: Maintains SRAM integrity and RTC operation for >72 hours using 0.47F MaxCap without external circuitry. |
| Medical Diagnostic Equipment | Automotive Telematics Module |
|
Use Scenario: Portable ultrasound device detects battery depletion before critical scan interruption. IC Role / Device Role / Timing Role: Uses PFI/PFO comparator with ±2% accuracy to trigger low-battery alert at 3.1V (Li-ion 10% SOC). Use Value: Provides clinically actionable warning with <60µs response latency, meeting IEC 62304 Class C requirements. |
Use Scenario: Cellular-connected ECU maintains CAN bus communication during engine cranking voltage dip. IC Role / Device Role / Timing Role: Generates clean 200ms reset pulse synchronized to VCC recovery; isolates CE signals during 6V–12V transients. Use Value: Eliminates CAN frame loss and module reinitialization delays during cold-start sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693AESE+T | Narrow SO package (3.9mm width vs. 7.5mm Wide SO); identical electrical specs and pinout | Preferred for space-constrained PCBs where 16-pin SO footprint must minimize board area | Select MAX693AESE+T when layout density is prioritized over thermal dissipation margin |
| MAX800MESE+T | Same 4.4V reset threshold and -40°C to +85°C rating, but guarantees ±2% PFI accuracy (MAX693A does not specify PFI accuracy) | Required for designs needing certified power-fail detection, e.g., energy metering or safety-critical logging | Choose MAX800MESE+T when PFI comparator accuracy is mandatory; otherwise MAX693AEWE+T offers full feature parity at lower cost |
Compared with MAX693AEWE+T, MAX693AESE+T reduces PCB footprint by 50% with no electrical trade-offs, while MAX800MESE+T adds certified ±2% PFI accuracy essential for metrology-grade power monitoring - making MAX693AEWE+T optimal for general-purpose industrial supervision where cost and thermal performance outweigh ultra-precise comparator needs.
Availability
MAX693AEWE+T is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic equipment, and automotive telematics modules requiring stable component supply across extended temperature ranges.
Supply support for MAX693AEWE+T 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, medical, and automotive markets.
The MAX691A/MAX693A family targets μP-based systems needing coordinated reset generation, watchdog supervision, and battery-backed memory retention - optimized for reliability in harsh environments with wide temperature operation.
FAQ
What is the reset threshold voltage of the MAX693AEWE+T?
The MAX693AEWE+T has a typical reset threshold voltage of 4.40V, with a guaranteed range of 4.25V to 4.50V across temperature. This value is fixed for the MAX693A variant and differs from the 4.65V threshold of the MAX691A. The threshold applies to both RESET and RESET outputs and remains stable over the full -40°C to +85°C operating range.
Does the MAX693AEWE+T support battery backup, and what are the voltage limits?
Yes, the MAX693AEWE+T supports battery backup via the VBATT pin. It switches to battery power when VCC falls below VBATT − 0.3V (with 60mV hysteresis) and operates with VBATT as low as 2.0V. In battery-backup mode, VOUT tracks VBATT with ≤0.15V dropout at 5mA, and RESET remains valid down to VCC = 1V - ensuring continuous supervision even during deep discharge.
How does the watchdog function work on the MAX693AEWE+T?
The MAX693AEWE+T watchdog monitors the WDI pin: a transition (high↔low or ≥100ns pulse) resets the timer. If no transition occurs within the timeout period (1.6s nominal, or 100ms with OSC SEL = high), WDO and RESET assert for 200ms. Leaving WDI unconnected disables the watchdog via internal 1.6V bias. WDO is an open-drain TTL-compatible output.
What is the purpose of the CE IN and CE OUT pins on the MAX693AEWE+T?
The CE IN and CE OUT pins provide hardware-enforced chip-enable gating. During normal operation, CE IN passes directly to CE OUT. When RESET is asserted (e.g., during power failure), CE OUT is disabled to prevent spurious writes to CMOS RAM or EEPROM. The path has ≤10ns propagation delay and 75Ω series resistance in enabled mode - preserving timing integrity for fast μPs.
Can the MAX693AEWE+T be used with a 3.3V microprocessor system?
No - the MAX693AEWE+T is specified for VCC = +4.5V to +5.5V and has a 4.4V reset threshold; it is not designed for direct use with 3.3V systems. For 3.3V supervision, consider the MAX6326 or MAX6369 families. Using MAX693AEWE+T with a 3.3V rail would result in permanent RESET assertion, as VCC never exceeds the 4.4V threshold.
MAX693AEWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX693AEWE+T FAQ
1.How can I place an order for MAX693AEWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693AEWE+T 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 MAX693AEWE+T reliable?
The price and inventory of MAX693AEWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693AEWE+T is usually 5 days.
3.What payment methods are accepted for MAX693AEWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693AEWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693AEWE+T?
MAX693AEWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693AEWE+T 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 MAX693AEWE+T?
For technical support, including MAX693AEWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693AEWE+T requirements.
6.How does Aetrix verify that MAX693AEWE+T is sourced from the original manufacturer or authorized distributors?
All MAX693AEWE+T 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 MAX693AEWE+T meets industry standards.
7.What is the process for return or replacement of MAX693AEWE+T?
All MAX693AEWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX693AEWE+T, 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 MAX693AEWE+T part is unused and in its original packaging.
Return procedure for MAX693AEWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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