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Analog Devices Inc./Maxim Integrated MAX693AEWE
- Part No.:
- MAX693AEWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693AEWE.pdf
- Description:
- IC SUPERVISOR MAX693 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:875
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Product details
Overview
MAX693AEWE 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 RESET/RESET during undervoltage, and provides battery switchover (VBATT to VOUT) for CMOS RAM backup in industrial controllers and intelligent instruments.
For engineers reviewing the MAX693AEWE datasheet, MAX693AEWE pinout, MAX693AEWE application, or MAX693AEWE equivalent, this device delivers guaranteed RESET assertion down to VCC = 1V, ±2% power-fail accuracy, and 6ns CE propagation delay - critical for reliable μP boot sequencing and data integrity during power transitions.
Technical Context
The MAX693AEWE implements dual-reset outputs (active-low RESET and active-high RESET), a programmable watchdog timer with selectable 100ms/1.6s timeout periods via OSC SEL/OSC IN, and a dedicated power-fail comparator (PFI/PFO) with 1.25V threshold and 25μs response. Its internal PMOS VCC-to-VOUT switch (0.8–1.4Ω) and VBATT-to-VOUT switch (15–30Ω) enable seamless battery switchover when VCC falls below VBATT − 0.3V.
Chip-enable gating uses a transmission gate (75–150Ω on-resistance, 6–10ns propagation delay) between CE IN and CE OUT, disabled during reset assertion to prevent spurious writes to memory. The WDI input features three-level detection (high/low/floating) with 100ns minimum pulse width, and internal biasing to 1.6V when unconnected to disable watchdog by default.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.40V typical - ensures reliable μP reset initiation at VCC < 4.4V, with 15mV hysteresis to prevent chatter during brownout recovery. |
| Reset Active Timeout (Power-up) | 200ms typical - guarantees sufficient hold time for μP initialization before release, independent of external clock. |
| Supply Current (Operating) | 30μA typical - enables low-power system monitoring without significant load on 5V rail. |
| VCC-to-VOUT On-Resistance | 0.8–1.4Ω - limits voltage drop to ≤200mV at 250mA, supporting stable memory supply during main power operation. |
| Watchdog Timeout (Long) | 1.6s nominal - provides robust software activity monitoring with minimal false triggers in embedded firmware loops. |
| CE Propagation Delay | 6–10ns - preserves timing integrity for high-speed μP CE signals, compatible with >50MHz bus operation. |
| Power-Fail Accuracy | ±2% - enables precise early-warning detection of VCC sag or battery depletion without calibration. |
Pinout & Package
MAX693AEWE is housed in a 16-pin Wide SO (SOIC-W) package, 7.5mm × 10.3mm body, 1.27mm pitch, RoHS-compliant lead-free option available (suffix +).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Connects to backup capacitor or battery; enables VOUT sourcing from VBATT when VCC < VBATT − 0.3V. |
| 2 VOUT | Output Supply Voltage | Main system supply output; switches between VCC and VBATT; requires 0.1µF decoupling to GND. |
| 3 VCC | Main Power Input | 5V regulated supply input; monitored for reset generation and CE gating control. |
| 4 GND | Ground Reference | 0V reference for all analog and digital functions; must be low-impedance connection. |
| 5 BATT ON | Battery-On Status Output | Open-drain logic-high indicator when VOUT sourced from VBATT; sinks 3.2mA at 0.1V. |
| 6 LOW LINE | Reset Comparator Buffer | Direct buffered output of reset threshold comparator; used for external status indication. |
| 7 OSC IN | External Oscillator Input | Accepts timing capacitor or external clock to configure watchdog/reset timeouts; biased to 1.6V if floating. |
| 8 OSC SEL | Oscillator Select Control | High = internal oscillator (1.6s/200ms); low = external timing (capacitor/clock); 10µA internal pull-up. |
| 9 PFI | Power-Fail Input | Non-inverting input to uncommitted comparator; 1.25V threshold for low-battery or early power-fail warning. |
| 10 PFO | Power-Fail Output | Open-drain comparator output; goes low when PFI < 1.25V; sinks 3.2mA at 0.1V saturation. |
| 11 WDI | Watchdog Input | Three-level input (high/low/floating); transition resets watchdog timer; 100ns minimum pulse width. |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; disabled during reset to prevent memory corruption; 75Ω series impedance. |
| 13 CE IN | Chip-Enable Input | Input to CE gating circuit; high-impedance during reset; leakage ±1µA max over temperature. |
| 14 WDO | Watchdog Output | Asserts low on watchdog timeout; inverse of WDI activity; remains high if WDI unconnected. |
| 15 RESET | Active-Low Reset Output | Open-drain output; valid down to VCC = 1V; sinks 3.2mA at 0.1V; requires external pull-up. |
| 16 RESET | Active-High Reset Output | Open-drain complement of RESET; high-impedance when inactive; pulled to VOUT when asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic μP reset even during deep brownout, eliminating need for external reset IC in low-voltage edge cases. |
| Integrated CE signal gating (6–10ns delay) | Prevents erroneous writes to CMOS RAM during power failure without adding external logic or timing margin overhead. |
| MaxCap®/SuperCap-compatible battery switchover | Supports direct connection to large backup capacitors (e.g., 0.47F) with controlled inrush and low-loss switching. |
| ±2% power-fail comparator accuracy (MAX800L/M) | Enables calibrated low-battery warning or predictive power-fail signaling without trimming or calibration components. |
| Selectably programmable watchdog timeout | Allows runtime configuration of 100ms (fast fault detection) or 1.6s (firmware loop tolerance) via OSC SEL pin state. |
Applications
| Industrial Controller Power Monitoring | Intelligent Instrument Data Retention |
|---|---|
|
Use Scenario: PLC or RTU operating in harsh environments where mains voltage sags or interruptions occur frequently. IC Role / Device Role / Timing Role: Supervises 5V supply, asserts RESET for 200ms on undervoltage, gates CE to freeze memory writes, and switches VOUT to VBATT to retain RAM contents. Use Value: Prevents corrupted control logic execution and preserves critical process state across power glitches up to 500ms duration. |
Use Scenario: Portable multimeter or handheld analyzer requiring nonvolatile parameter storage during battery replacement. IC Role / Device Role / Timing Role: Monitors main supply and backup capacitor voltage; asserts BATT ON to signal switchover; maintains VOUT from VBATT while VCC is absent. Use Value: Enables hot-swap battery replacement with zero data loss and no system reboot required. |
| Critical μP Boot Sequencing | Embedded System Power-Fail Warning |
|
Use Scenario: Medical diagnostic device with ARM Cortex-M7 μP requiring strict boot timing compliance per IEC 62304. IC Role / Device Role / Timing Role: Generates precise 200ms reset pulse synchronized to VCC ramp; validates RESET assertion down to 1V to cover worst-case LDO dropout. Use Value: Guarantees deterministic μP initialization under all specified input conditions, satisfying safety-critical boot validation requirements. |
Use Scenario: Network gateway with Li-ion backup battery needing early depletion alert before shutdown. IC Role / Device Role / Timing Role: Uses PFI/PFO comparator with resistor divider to detect battery voltage < 3.3V; asserts PFO low 25μs after threshold crossing. Use Value: Provides 100ms+ warning window for graceful firmware save and shutdown, avoiding abrupt power loss data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691AEWE | 4.65V reset threshold (vs. 4.40V); identical pinout, timing, and feature set except reset voltage level. | Suitable for systems with tighter 5V rail tolerance where earlier reset assertion is required. | Select MAX691AEWE when VCC nominal is 5.0V ±2% and reset must trigger before dropping below 4.6V. |
| MAX800MESE | Same 4.4V reset threshold; offered in 16-pin Narrow SO (vs. Wide SO); ±2% PFI accuracy guaranteed; same electrical specs. | Preferred for space-constrained PCBs where 7.5mm × 10.3mm Wide SO footprint is prohibitive. | Choose MAX800MESE when board area is constrained and 3.9mm × 9.9mm Narrow SO fits layout requirements. |
Compared with MAX693AEWE, MAX691AEWE provides earlier reset activation for higher-VCC stability margins, while MAX800MESE offers identical functionality in a smaller package - enabling trade-offs between reset timing precision and PCB real estate without sacrificing reliability or feature coverage.
Availability
MAX693AEWE is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, and critical μP power monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across -40°C to +85°C.
Supply support for MAX693AEWE 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX691A/MAX693A family targets μP-based systems requiring coordinated reset, watchdog, memory write protection, and battery backup - delivering single-chip supervision with guaranteed sub-1V reset validity and ±2% comparator accuracy.
FAQ
What is the reset threshold voltage of the MAX693AEWE?
The MAX693AEWE 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 series. The MAX693AEWE asserts RESET and RESET outputs when VCC falls below this threshold and holds them active for 200ms after VCC rises above it during power-up.
Does the MAX693AEWE support battery backup for CMOS RAM?
Yes, the MAX693AEWE supports battery backup for CMOS RAM via its VBATT input and VOUT output. When VCC drops below VBATT − 0.3V and the reset threshold, the device automatically switches VOUT sourcing from VCC to VBATT. The BATT ON output signals this transition, and the internal PMOS switch (15–30Ω) ensures low-loss backup power delivery up to 25mA continuous current.
How does the watchdog function operate on the MAX693AEWE?
The MAX693AEWE watchdog monitors the WDI input: if WDI remains static (high or low) longer than the configured timeout (100ms or 1.6s), WDO goes low and RESET/RESET are asserted for 200ms. A 100ns pulse or level transition resets the timer. Leaving WDI unconnected biases it to ~1.6V via internal resistors, disabling the watchdog - a key design feature for systems not requiring runtime supervision.
Can the MAX693AEWE be used with a 3.3V microprocessor?
No, the MAX693AEWE is designed for 5V systems: its VCC operating range is +4.5V to +5.5V, and its reset threshold (4.4V) and internal regulators assume a 5V nominal supply. Using it with a 3.3V μP would violate absolute maximum ratings and prevent proper reset assertion. For 3.3V systems, consider the MAX6326 or MAX6369 families instead.
What package type is the MAX693AEWE supplied in?
The MAX693AEWE is supplied in a 16-pin Wide SO (SOIC-W) package, measuring 7.5mm × 10.3mm with 1.27mm lead pitch. It is rated for operation from -40°C to +85°C and is available in lead-free configuration (add '+' suffix when ordering). This package provides enhanced thermal dissipation (762mW at +70°C) compared to Narrow SO or TSSOP variants.
MAX693AEWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for MAX693AEWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693AEWE 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 reliable?
The price and inventory of MAX693AEWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693AEWE is usually 5 days.
3.What payment methods are accepted for MAX693AEWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693AEWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693AEWE?
MAX693AEWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693AEWE 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?
For technical support, including MAX693AEWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693AEWE requirements.
6.How does Aetrix verify that MAX693AEWE is sourced from the original manufacturer or authorized distributors?
All MAX693AEWE 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 meets industry standards.
7.What is the process for return or replacement of MAX693AEWE?
All MAX693AEWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX693AEWE, 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 part is unused and in its original packaging.
Return procedure for MAX693AEWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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