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Analog Devices Inc./Maxim Integrated MAX691AESE+T
- Part No.:
- MAX691AESE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX691AESE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
MAX691AESE+T from Maxim Integrated is a microprocessor supervisory circuit with 4.65V reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and integrated chip-enable gating for CMOS RAM protection. It monitors VCC in industrial controllers and intelligent instruments, asserting RESET down to VCC = 1V and supporting battery switchover for backup power retention.
For engineers reviewing the MAX691AESE+T datasheet, MAX691AESE+T pinout, MAX691AESE+T application, or MAX691AESE+T equivalent, this device delivers verified reset timing accuracy (±15mV hysteresis), guaranteed low-voltage RESET assertion, and validated CE signal gating with ≤10ns propagation delay under 50pF load - critical for reliable μP boot sequencing and brownout recovery.
Technical Context
The MAX691AESE+T implements dual-reset outputs (active-low RESET and active-high RESET) driven by a precision voltage comparator with 4.65V nominal threshold and 15mV hysteresis, ensuring stable assertion during VCC transitions. Its internal oscillator sets fixed 200ms reset timeout and 1.6s watchdog period unless overridden via OSC SEL/OSC IN.
Chip-enable gating uses a 75Ω series transmission gate between CE IN and CE OUT, enabling transparent pass-through during normal operation and forced disablement during reset assertion. Battery switchover logic activates when VCC falls below VBATT − 0.3V and the reset threshold, routing VOUT to VBATT while asserting BATT ON high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.65V typical; ensures reliable μP reset initiation at standard +5V rail brownout levels |
| Reset Timeout Period | 200ms typical; provides sufficient hold time for μP initialization after power stabilization |
| Supply Current (Operating) | 30μA typical; enables low-power monitoring in always-on embedded systems |
| VCC-to-VOUT On-Resistance | 0.8–1.4Ω; limits voltage drop to ≤200mV at 250mA load, preserving system supply integrity |
| CE IN-to-CE OUT Propagation Delay | 6–10ns; supports high-speed μP bus timing without CE skew or data corruption |
| RESET Output Validity Range | Down to VCC = 1V; guarantees reset assertion even during deep brownout conditions |
| Power-Fail Comparator Accuracy | ±2% (MAX800L/M only); not applicable to MAX691AESE+T per datasheet scope |
Pinout & Package
MAX691AESE+T is housed in a 16-pin narrow SOIC package (body width 3.9mm, lead pitch 0.05in), RoHS-compliant with +85°C maximum operating temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-backup input | Connects to backup capacitor or battery; enables VOUT sourcing when VCC fails |
| 2 VOUT | Output supply voltage | Switched output sourced from VCC or VBATT; powers external RAM/EEPROM |
| 3 VCC | Main supply input | +4.75V to +5.5V regulated supply; monitored for reset generation |
| 4 GND | Ground reference | 0V return for all analog and digital functions; decoupling capacitor anchor |
| 5 BATT ON | Battery-status indicator | Open-drain output high during battery-backup mode; drives PNP base for >250mA loads |
| 6 LOW LINE | Reset comparator buffer | Active-low signal mirroring RESET threshold crossing; used for system status indication |
| 7 OSC IN | Oscillator timing input | Accepts external capacitor or clock; sets watchdog/reset timeout periods when OSC SEL = GND |
| 8 OSC SEL | Oscillator mode select | High or floating → internal oscillator; low → external timing control |
| 9 PFI | Power-fail comparator input | Non-inverting input referenced to 1.25V; triggers PFO on undervoltage detection |
| 10 PFO | Power-fail comparator output | Open-drain output low when PFI < 1.25V; independent of reset logic |
| 11 WDI | Watchdog input | Three-level input (high/low/floating); resets watchdog timer on edge or pulse ≥100ns |
| 12 CE OUT | Controlled chip-enable output | Gated CE signal passed only when VCC > reset threshold and CE IN low |
| 13 CE IN | Chip-enable input | High-impedance during reset; enables CE gating path during normal operation |
| 14 WDO | Watchdog output | Active-low open-drain output asserted on watchdog timeout; mirrors RESET timing |
| 15 RESET | Active-low reset output | Open-drain output asserted low during VCC brownout or watchdog fault |
| 16 RESET | Active-high reset output | Open-drain output asserted high during same conditions; inverse of RESET |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs (RESET/RESET) | Supports both active-high and active-low μP reset inputs without external inverters |
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior during severe brownout, eliminating code-execution errors |
| On-board CE signal gating | Prevents spurious writes to CMOS RAM during power failure by disabling CE path within 15μs of reset assertion |
| MaxCap®/SuperCap compatible backup | Enables use of large-value backup capacitors (e.g., 0.47F) with controlled switchover timing |
| Low-quiescent-current battery-backup mode | Draws ≤1μA from VBATT when VCC is absent, extending backup runtime in critical systems |
Applications
| Industrial Controller Monitoring | Intelligent Instrument Power Management |
|---|---|
Use Scenario: Continuous operation of PLC I/O modules with nonvolatile parameter storage. IC Role / Device Role / Timing Role: Supervises +5V VCC rail, asserts RESET on brownout, gates CE to prevent RAM corruption during transient faults. Use Value: Eliminates firmware crashes caused by partial memory writes during power interruption; maintains configuration integrity across 100k+ power cycles. |
Use Scenario: Portable multimeter with EEPROM calibration data and real-time clock backup. IC Role / Device Role / Timing Role: Switches VOUT to VBATT on main supply loss, asserts RESET to halt measurement engine, signals BATT ON for RTC enable. Use Value: Preserves calibration constants and timekeeping during battery-only operation with <1μA standby drain. |
| Critical μP Power Monitoring | Computing System Reset Sequencing |
Use Scenario: Medical diagnostic equipment requiring fail-safe boot verification. IC Role / Device Role / Timing Role: Monitors VCC with 4.65V threshold and 15mV hysteresis; generates 200ms RESET pulse to ensure full μP initialization before peripheral enable. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing deterministic reset state prior to code execution. |
Use Scenario: Embedded x86-based HMI with CMOS SRAM cache and watchdog supervision. IC Role / Device Role / Timing Role: Provides synchronized RESET/RESET outputs, feeds WDI from GPIO, gates CE to SRAM during reset hold. Use Value: Prevents cache coherency failures and bus contention during cold/warm restarts; reduces field failure rate by >99.8% vs. discrete reset solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACSE+ | 0°C to +70°C operating range; identical electrical specs and pinout | Suitable for commercial-temperature environments only | Select when ambient temperature remains within 0–70°C and cost sensitivity outweighs extended temp grade |
| MAX693AESE+ | 4.4V reset threshold; otherwise identical package, pinout, and feature set | Required where system brownout detection must trigger at lower VCC (e.g., +5V ±5% rails) | Choose when design operates near lower VCC tolerance limit and requires earlier reset assertion |
Compared with MAX691ACSE+, the MAX691AESE+T offers extended -40°C to +85°C operation for industrial deployments, while MAX693AESE+ shifts reset threshold downward for tighter supply regulation margins - neither is pin-compatible with MAX691AESE+T due to differing thermal and voltage specifications.
Availability
MAX691AESE+T is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, critical μP power monitoring, and computing system reset sequencing requiring stable component supply across extended temperature ranges.
Supply support for MAX691AESE+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 industrial, automotive, and communications applications, with emphasis on power management and reliability-critical functions.
The MAX691A family targets microprocessor supervisory needs in harsh environments, delivering guaranteed reset timing, battery switchover, and CE gating to prevent data corruption during power anomalies.
FAQ
What is the operating temperature range of the MAX691AESE+T?
The MAX691AESE+T is rated for -40°C to +85°C operation, making it suitable for industrial and extended-temperature embedded applications. This range is confirmed in the Ordering Information table, where the "E" suffix denotes the extended temperature grade. The device maintains full electrical specification compliance across this range, including reset threshold stability and CE propagation delay performance.
Does the MAX691AESE+T support battery backup for CMOS RAM?
Yes, the MAX691AESE+T supports battery backup via its VBATT pin and internal PMOS switchover circuit. When VCC falls below the reset threshold and VBATT, VOUT automatically connects to VBATT, sustaining power to external RAM. The BATT ON output signals switchover status, and the device draws ≤1μA from VBATT in backup mode - verified in Electrical Characteristics under "Supply Current in Battery-Backup Mode".
Can the MAX691AESE+T be used with a 3.3V microprocessor?
No, the MAX691AESE+T is designed for +5V systems: its VCC operating range is +4.75V to +5.5V, and its 4.65V reset threshold assumes a 5V nominal rail. Using it with a 3.3V μP would result in continuous reset assertion. For 3.3V applications, consider the MAX6326 or MAX6361 families, which offer matching functionality at 3.3V-compatible thresholds.
What is the function of the two RESET pins (pins 15 and 16) on the MAX691AESE+T?
Pin 15 (RESET) is an active-low open-drain output; pin 16 (RESET) is its active-high complement, also open-drain. Both assert simultaneously during VCC brownout or watchdog timeout. This dual-output architecture eliminates need for external inverters when interfacing with μPs requiring either polarity - a key design feature confirmed in the Pin Description and Detailed Description sections.
Is the MAX691AESE+T pin-compatible with the legacy MAX691?
Yes, the MAX691AESE+T is explicitly described as a "pin-compatible upgrade" to the MAX691 in the General Description. All 16 pins retain identical functions, electrical characteristics, and timing behavior. However, improvements include reduced supply current (30μA vs. legacy 50μA), tighter reset threshold tolerance, and enhanced CE propagation delay (≤10ns vs. legacy 15ns), as documented in the datasheet's opening paragraph and Electrical Characteristics tables.
MAX691AESE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- 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
MAX691AESE+T FAQ
1.How can I place an order for MAX691AESE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX691AESE+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 MAX691AESE+T reliable?
The price and inventory of MAX691AESE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX691AESE+T is usually 5 days.
3.What payment methods are accepted for MAX691AESE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX691AESE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX691AESE+T?
MAX691AESE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX691AESE+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 MAX691AESE+T?
For technical support, including MAX691AESE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX691AESE+T requirements.
6.How does Aetrix verify that MAX691AESE+T is sourced from the original manufacturer or authorized distributors?
All MAX691AESE+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 MAX691AESE+T meets industry standards.
7.What is the process for return or replacement of MAX691AESE+T?
All MAX691AESE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX691AESE+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 MAX691AESE+T part is unused and in its original packaging.
Return procedure for MAX691AESE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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