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Analog Devices Inc./Maxim Integrated MAX692AESA+
- Part No.:
- MAX692AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX692AESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
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Product details
Overview
The MAX692AESA+ from Maxim Integrated is a microprocessor supervisory circuit providing precision reset generation, battery-backup switchover, watchdog timer, and power-fail detection for +5V systems. It asserts active-low RESET during power-up, brownout (VCC < 4.40V), and watchdog timeout (1.6s), delivers VOUT from VCC or VBATT with 5Ω/80Ω PMOS switching, and features a 1.25V PFI comparator with ±2% accuracy for low-battery or unregulated supply monitoring in industrial controllers.
For engineers reviewing the MAX692AESA+ datasheet, MAX692AESA+ pinout, MAX692AESA+ application, or MAX692AESA+ equivalent, key selection criteria include its −40°C to +85°C operating range, 4.40V reset threshold, 200ms reset pulse width, 200μA quiescent current, and guaranteed RESET assertion down to VCC = 1V - critical for reliable μP startup and brownout recovery in battery-backed embedded systems.
Technical Context
The MAX692AESA+ integrates four independent functional blocks: a precision voltage monitor with hysteresis (4.40V ±20mV threshold), a monostable reset generator (200ms pulse), a 1.6s watchdog timer cleared by WDI edges or reset assertion, and a dual-path power switch that connects VOUT to VCC above threshold (5Ω) or to VBATT below threshold (80Ω) only when VBATT > VCC + 20mV.
Its PFI comparator operates independently of reset logic, comparing external voltage dividers against a trimmed 1.25V reference; PFO asserts low when PFI < 1.25V, with 400ns response time and <25nA input bias. The device guarantees RESET output validity down to VCC = 1.2V and supports bidirectional μP reset pins via external series resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±20mV - ensures reliable reset assertion before +5V supply drops below μP minimum operating voltage. |
| Reset Pulse Width | 200ms - provides sufficient hold time for full μP initialization and peripheral stabilization. |
| Watchdog Timeout | 1.6s - allows typical firmware service intervals while detecting lockups in real-time control loops. |
| Quiescent Current | 200μA at VCC = 5V - minimizes standby power in always-on battery-backed systems. |
| Battery-Backup Current | 50nA at VCC = 0V, VBATT = 2.8V - extends lithium battery life beyond 10 years in memory retention applications. |
| VOUT Switch Resistance | 5Ω (VCC path), 80Ω (VBATT path) - limits voltage drop under 5mA RAM load to <25mV and <400mV respectively. |
| Power-Fail Accuracy | ±2% - enables precise undervoltage warning for regulated +5V supplies without external calibration. |
Pinout & Package
MAX692AESA+ is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, 150mil body width, with gull-wing leads and RoHS-compliant lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (5Ω) and VBATT (80Ω) based on reset threshold crossing; maintains RAM voltage during brownout. |
| 2 - VCC | +5V main supply input | Primary power source; powers internal circuitry and drives VOUT when above 4.40V; must be ≥1.2V for RESET assertion. |
| 3 - GND | Circuit ground reference | Common return for all analog and digital functions; requires low-impedance connection to minimize noise on PFI/PFO. |
| 4 - PFI | Power-fail comparator input | Accepts voltage divider output; triggers PFO low when <1.25V; input bias <25nA enables high-impedance sensing networks. |
| 5 - PFO | Power-fail open-drain output | Asserts low to signal impending supply failure; sinks 3.2mA; requires external pull-up for interrupt generation to μP. |
| 6 - WDI | Watchdog timer input | Edge-sensitive; clears timer on rising/falling transitions; floating or high-Z disables watchdog; internal 35% VCC bias prevents false timeouts. |
| 7 - RESET | Active-low reset output | Open-drain output; guaranteed low from VCC = 1.2V to 0V; pulses low for 200ms after threshold crossing or watchdog timeout. |
| 8 - VBATT | Backup battery input | Supplies VOUT only when VCC < 4.40V and VBATT > VCC + 20mV; reverse diode prevents substrate conduction if VBATT > VCC + 0.6V. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1.2V | Ensures deterministic reset behavior even during deep brownout conditions where other supervisors fail. |
| 40mV reset threshold hysteresis | Prevents oscillatory reset assertion during slow VCC ramp-down, eliminating system instability near trip point. |
| Independent PFI comparator with 400ns response | Enables fast power-fail interrupts without affecting reset timing or watchdog operation. |
| VBATT switchover with 20mV turn-on/turn-off thresholds | Eliminates chatter during marginal VCC recovery by enforcing 40mV hysteresis on battery engagement. |
| 50nA battery-backup quiescent current | Supports >10-year lithium coin cell life in CMOS RAM retention applications with no periodic refresh. |
Applications
| Industrial Programmable Logic Controllers (PLCs) | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: PLC CPU module powered from 5V rail with lithium backup for SRAM and real-time clock during mains outage. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery switchover, and watchdog supervision for ARM Cortex-M7 core. Use Value: Prevents corrupted ladder logic execution during grid fluctuations; maintains RTC accuracy for event logging with <1μA backup draw. | Use Scenario: Portable ultrasound device with flash memory and sensor buffers requiring nonvolatile state retention during battery swaps. IC Role / Device Role / Timing Role: Power integrity manager asserting RESET on 5V DC-DC output sag and enabling seamless VBATT-to-VCC transition. Use Value: Eliminates mandatory shutdown sequence; allows hot-swap of primary Li-ion pack without data loss or calibration drift. |
| Smart Energy Meters | Ruggedized Data Loggers |
Use Scenario: ANSI C12.22-compliant meter with tamper-detection EEPROM and metrology ASIC powered from isolated 5V supply. IC Role / Device Role / Timing Role: Dual-function supervisor generating PFO interrupt for pre-failure alert and RESET pulse for secure firmware rollback. Use Value: Meets IEC 62056-21 fault logging requirements by triggering EEPROM write before VCC collapse; ±2% PFI accuracy ensures consistent trip across temperature. | Use Scenario: Environmental sensor node deployed in remote locations with primary alkaline batteries and supercapacitor backup. IC Role / Device Role / Timing Role: System health monitor using WDI to detect firmware hangs and PFI to warn of declining battery voltage. Use Value: Extends field deployment interval by 3× through 200μA active current and 50nA backup mode; 1.6s watchdog prevents missed sensor readings during RF transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MESA+ | Identical electrical specs, same 4.40V reset threshold, ±2% PFI accuracy, and pinout; differs only in ordering code (M vs. A grade). | No functional difference; both rated −40°C to +85°C in 8-SO package with lead-free finish. | Select MAX802MESA+ if sourcing from legacy inventory or distributor stock with identical qualification. |
| TPS3808G125DBVR | Lower 1.25V fixed reset threshold, 360ms min pulse width, 350nA IQ, no battery switchover or PFI comparator. | Only suitable for basic reset-only applications; lacks VBATT switching and power-fail warning capability. | Choose only if system omits battery backup and uses separate power-fail monitoring; not a functional substitute. |
Compared with MAX802MESA+, the MAX692AESA+ offers identical supervision functionality but is optimized for legacy design continuity; versus TPS3808G125DBVR, it provides integrated battery management and power-fail signaling essential for self-contained embedded systems.
Availability
MAX692AESA+ is available at Aetrix Electronics and suitable for industrial PLCs, medical handhelds, smart energy meters, ruggedized data loggers, and battery-backed instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX692AESA+ 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, communications, and computing applications.
The MAX692AESA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power monitoring and fail-safe reset control in battery-backed +5V μP systems operating across harsh environmental conditions.
FAQ
What is the guaranteed minimum VCC voltage at which MAX692AESA+ asserts RESET?
The MAX692AESA+ guarantees RESET assertion down to VCC = 1.2V across its full −40°C to +85°C operating range. This ensures deterministic reset behavior during deep brownout events where many competing supervisors cease functioning. The specification is validated per Electrical Characteristics table, with ISINK = 100μA test condition, and directly enables reliable recovery in systems with slow-failing power supplies.
Does MAX692AESA+ support active-high reset outputs?
No, the MAX692AESA+ provides only an active-low RESET output. Its pin 7 is an open-drain RESET signal that pulls low during power-up, brownout, or watchdog timeout. For active-high reset requirements, designers must use the MAX805L variant - which features complementary RESET and RESET outputs - or add an external inverter. The MAX692AESA+ datasheet explicitly confirms this limitation in the Pin Description and Detailed Description sections.
How does the MAX692AESA+ handle battery switchover hysteresis?
The MAX692AESA+ implements 40mV hysteresis on VBATT switchover: VOUT connects to VBATT when VCC falls below the reset threshold (4.40V) and VBATT exceeds VCC by >20mV; VOUT reverts to VCC when VCC rises above VBATT by >20mV. This prevents oscillation during slow VCC recovery and is implemented via dedicated comparator circuitry independent of the main reset generator, ensuring clean, chatter-free RAM supply transitions.
Can MAX692AESA+ monitor negative supply rails?
Yes, the MAX692AESA+ can monitor negative voltages using an external resistor network that level-shifts the negative rail to the PFI input. As documented in Figure 7 of the datasheet, connecting R1 and R2 between V− and GND creates a Thevenin-equivalent positive voltage at PFI. When the negative rail degrades (less negative), PFI rises above 1.25V and PFO goes high - enabling undervoltage detection for −5V, −12V, or other negative supplies with accuracy limited by resistor tolerance and PFI threshold variation.
What is the maximum allowable VBATT voltage for MAX692AESA+?
The maximum allowable VBATT voltage for MAX692AESA+ is 4.55V, as specified in Table 2 of the datasheet. Exceeding this risks forward-biasing the internal substrate diode (D1 in Figure 3) when VCC is near its reset threshold, causing unintended current flow from VBATT to VCC and potential damage. This limit applies regardless of whether lithium cells or supercapacitors are used, and must be enforced via external clamping or voltage regulation in designs with higher-voltage backup sources.
MAX692AESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-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:
- 4.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX692AESA+ FAQ
1.How can I place an order for MAX692AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692AESA+ 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 MAX692AESA+ reliable?
The price and inventory of MAX692AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692AESA+ is usually 5 days.
3.What payment methods are accepted for MAX692AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692AESA+?
MAX692AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692AESA+ 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 MAX692AESA+?
For technical support, including MAX692AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692AESA+ requirements.
6.How does Aetrix verify that MAX692AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX692AESA+ 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 MAX692AESA+ meets industry standards.
7.What is the process for return or replacement of MAX692AESA+?
All MAX692AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX692AESA+, 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 MAX692AESA+ part is unused and in its original packaging.
Return procedure for MAX692AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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