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Analog Devices Inc./Maxim Integrated MAX692EPA+
- Part No.:
- MAX692EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX692EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
MAX692EPA+ from Maxim Integrated is a microprocessor supervisory circuit providing power-on reset, battery-backup switching, watchdog timer, and power-fail detection in a single 8-pin PDIP package. It asserts active-low RESET during power-up (VCC ≥ 1V), brownout (VCC < 4.40V), and watchdog timeout (1.6s), while delivering VOUT from VCC or VBATT with 5Ω/80Ω switch impedance and consuming only 200µA quiescent current. It is used in industrial controllers and battery-backed memory systems requiring reliable µP initialization under unstable supply conditions.
For engineers reviewing the MAX692EPA+ datasheet, MAX692EPA+ pinout, MAX692EPA+ application, or MAX692EPA+ equivalent, key selection criteria include its −40°C to +85°C extended temperature range, guaranteed RESET assertion down to VCC = 1.2V, ±2% power-fail accuracy (shared with MAX802M), and compatibility with lithium backup batteries up to 4.55V.
Technical Context
The MAX692EPA+ integrates four independent functional blocks: a precision voltage monitor with 4.40V reset threshold (±2% over temperature), a 1.6s watchdog timer cleared by WDI edge transitions or RESET assertion, a battery switchover circuit that connects VBATT to VOUT only when VCC falls below threshold and VBATT > VCC + 20mV (40mV hysteresis), and a 1.25V reference-based power-fail comparator driving PFO low when PFI < 1.25V.
Its internal architecture uses a P-channel MOSFET for VCC-to-VOUT connection (5Ω RDS(ON)) and an 80Ω PMOS switch for VBATT-to-VOUT backup path. The RESET generator guarantees monotonic low-state timing: 200ms pulse width after VCC rise above threshold, and sustained low output until VCC drops below 1.2V - ensuring robust µP reset under slow-ramp or noisy supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V (min 4.25V, max 4.50V); triggers RESET when VCC falls below this level during brownout or power-down. |
| Reset Pulse Width | 200ms (typical); ensures sufficient duration for µP initialization without requiring external timing components. |
| Watchdog Timeout | 1.6s (min 1.0s, max 2.25s); detects µP lockup if WDI is not toggled within this window. |
| Quiescent Supply Current | 200µA (max 500µA at TA = −40°C to +85°C); enables long-term operation in battery-backed systems. |
| Battery-Backup Current | 5.0µA (max at full temp range); minimizes drain on lithium cells during extended VCC loss. |
| Power-Fail Accuracy | ±2% (guaranteed for MAX802M variant); ensures precise early warning of supply degradation before critical failure. |
| VOUT Switch Impedance | 5Ω (VCC→VOUT), 80Ω (VBATT→VOUT); maintains stable RAM supply voltage under load while limiting fault current. |
Pinout & Package
MAX692EPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body and through-hole mounting. Pin spacing is 0.100", lead finish is lead-free (RoHS-compliant) per the "+" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VOUT | CMOS RAM supply output | Switches between VCC (5Ω path) and VBATT (80Ω path) based on VCC/VBATT comparison; powers static RAM during main supply failure. |
| 2: VCC | +5V main supply input | Primary power source; monitored for reset generation and used as substrate reference; must be ≥ 1.2V for guaranteed RESET operation. |
| 3: GND | Circuit ground reference | Common return for all analog and digital functions; must be low-impedance to ensure accurate voltage monitoring. |
| 4: PFI | Power-fail comparator input | Accepts divided-down supply voltage; compared to internal 1.25V reference to generate PFO low signal when supply degrades. |
| 5: PFO | Power-fail open-drain output | Active-low signal indicating supply undervoltage; requires external pull-up; disabled during battery-backup mode. |
| 6: WDI | Watchdog timer input | Edge-sensitive input; toggling resets 1.6s timer; floating or high-impedance state disables watchdog function. |
| 7: RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, or watchdog timeout; guaranteed valid down to VCC = 1.2V. |
| 8: VBATT | Backup battery input | Accepts 2.8V–4.55V lithium cell; supplies VOUT only when VCC < reset threshold and VBATT > VCC + 20mV. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1.2V | Ensures reliable µP reset even during severe brownout where supply sags below typical logic thresholds. |
| 40mV switchover hysteresis | Prevents oscillatory VOUT switching during slow VCC ramp-down, eliminating RAM corruption risk. |
| 50nA PFI input leakage | Enables high-impedance voltage dividers for accurate power-fail sensing without loading error. |
| 200µA quiescent current | Extends battery life in always-on monitoring applications such as smart meters and remote sensors. |
| ±2% power-fail accuracy | Meets tight system-level supply margin requirements without calibration or trimming components. |
Applications
| Battery-Powered Controllers | Critical µP Power Monitoring |
|---|---|
Use Scenario: Industrial PLCs powered by primary DC supply with lithium coin-cell backup for volatile memory retention during mains outage. IC Role / Device Role / Timing Role: Supervisory IC providing brownout-triggered RESET, seamless VBATT switchover to VOUT, and early PFO warning before supply collapse. Use Value: Prevents RAM data loss and µP crash during transient line dips; eliminates need for discrete reset IC + battery switch + supervisor combo. |
Use Scenario: Medical diagnostic equipment requiring fail-safe boot sequence and continuous supply health monitoring. IC Role / Device Role / Timing Role: Primary reset generator with 200ms pulse width and 1.2V VCC minimum guarantee, plus watchdog supervision of firmware execution. Use Value: Meets IEC 62304 safety requirements for deterministic reset behavior under worst-case supply conditions. |
| Intelligent Instruments | Embedded Data Loggers |
Use Scenario: Portable multimeters and handheld analyzers using lithium battery with low-quiescent-current operation. IC Role / Device Role / Timing Role: Dual-role device: provides µP reset during battery insertion and monitors main supply for PFO-triggered data save. Use Value: 5.0µA max battery-backup current extends shelf life; ±2% PFI accuracy enables precise low-battery warning. |
Use Scenario: Environmental sensor nodes logging data to SRAM during intermittent solar charging cycles. IC Role / Device Role / Timing Role: Ensures clean µP startup after recharge, maintains RAM power via VBATT during dark periods, and signals impending power loss via PFO. Use Value: Eliminates external diode-or and LDO for backup path; reduces BOM count and PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MEPA+ | Identical reset threshold (4.40V), same ±2% PFI accuracy, identical pinout and electrical specs; differs only in part numbering convention (MAX802M vs MAX692A family branding). | Same use cases: battery-backed controllers, industrial µP monitoring. No functional distinction in design implementation. | Select MAX802MEPA+ when sourcing from distributors listing MAX802M series; electrically and mechanically interchangeable with MAX692EPA+. |
| MAX706RESA+ | 4.40V reset threshold, but no battery switchover (VBATT pin absent), no PFI/PFO comparator, and no watchdog timer - only reset + manual reset input. | Suitable for simple reset-only applications where backup power and power-fail warning are unnecessary. | Choose MAX706RESA+ only if battery backup and power-fail detection are excluded from system requirements; not a functional substitute for MAX692EPA+. |
Compared with MAX802MEPA+, MAX692EPA+ offers identical core supervision functionality but may differ in production lot traceability and long-term availability planning; versus MAX706RESA+, it adds three critical functions - battery switchover, watchdog, and power-fail detection - making it unsuitable as a drop-in replacement in systems relying on those features.
Availability
MAX692EPA+ is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, and embedded data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX692EPA+ 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 reliability, integration, and low-power operation.
The MAX692EPA+ belongs to Maxim's microprocessor supervisory circuit product line, engineered specifically for robust power monitoring and fail-safe µP initialization in mission-critical embedded systems operating across −40°C to +85°C.
FAQ
What is the guaranteed minimum VCC level at which MAX692EPA+ asserts RESET?
The MAX692EPA+ guarantees RESET assertion down to VCC = 1.2V across its full operating temperature range of −40°C to +85°C. This ensures reliable microprocessor reset initiation even during deep brownout conditions where supply voltage collapses below standard logic thresholds, a critical capability for fail-safe system recovery in industrial and medical applications using the MAX692EPA+.
Does MAX692EPA+ support lithium battery backup, and what is the maximum allowable VBATT voltage?
Yes, MAX692EPA+ supports lithium battery backup with a maximum allowable VBATT voltage of 4.55V, as specified in Table 2 of the datasheet. This limit ensures safe operation without forward-biasing the internal substrate diode (D1) when VCC is near its reset threshold. Lithium cells with open-circuit voltages between 2.8V and 4.55V can be connected directly to VBATT without external regulation when using the MAX692EPA+.
How does the watchdog timer in MAX692EPA+ respond to WDI pin states?
The MAX692EPA+ watchdog timer triggers RESET if WDI remains continuously high or low for 1.6 seconds. It is cleared by any rising or falling edge on WDI, by RESET assertion, or by placing WDI in high-impedance (three-state). If WDI is left floating, the internal bias (35% of VCC) holds it in an indeterminate state, disabling the watchdog - a deliberate safety feature confirmed in the MAX692EPA+ datasheet's WDI Input Threshold specification.
What is the purpose of the 40mV hysteresis in MAX692EPA+ battery switchover?
The 40mV hysteresis in MAX692EPA+ battery switchover prevents rapid toggling of VOUT between VCC and VBATT when VCC declines slowly near the reset threshold. Specifically, VBATT connects to VOUT when VCC falls 20mV below VBATT, and reconnects to VCC only when VCC rises 20mV above VBATT - creating a 40mV dead band. This eliminates potential RAM supply instability and data corruption during marginal supply conditions in systems using the MAX692EPA+.
Can MAX692EPA+ monitor negative supply rails, and how is this implemented?
Yes, MAX692EPA+ can monitor negative supply rails using an external resistor network that references the PFI input to ground, as shown in Figure 7 of the datasheet. When the negative rail degrades (becomes less negative), the voltage at PFI rises above 1.25V, causing PFO to go high - signaling supply failure. This technique leverages the MAX692EPA+'s internally generated 1.25V reference and isolated comparator, enabling bidirectional supply monitoring without modifying the MAX692EPA+ itself.
MAX692EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX692EPA+ FAQ
1.How can I place an order for MAX692EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692EPA+ 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 MAX692EPA+ reliable?
The price and inventory of MAX692EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692EPA+ is usually 5 days.
3.What payment methods are accepted for MAX692EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692EPA+?
MAX692EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692EPA+ 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 MAX692EPA+?
For technical support, including MAX692EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692EPA+ requirements.
6.How does Aetrix verify that MAX692EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX692EPA+ 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 MAX692EPA+ meets industry standards.
7.What is the process for return or replacement of MAX692EPA+?
All MAX692EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX692EPA+, 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 MAX692EPA+ part is unused and in its original packaging.
Return procedure for MAX692EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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