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Analog Devices Inc./Maxim Integrated MAX709REPA
- Part No.:
- MAX709REPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX709REPA.pdf
- Description:
- IC SUPERVISOR PWR SUP MON RESET
- Quantity:
- Payment:
- Shipping:
Inventory:7,902
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Product details
Overview
MAX709REPA from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +5V, +3.3V, and +3V systems. It asserts RESET when VCC falls below 2.63V (nominal), holds reset for ≥140ms after VCC rises above threshold, and guarantees valid RESET state down to VCC = 1V. Used in microprocessor-based embedded systems requiring reliable power-on/power-down supervision.
For engineers reviewing the MAX709REPA datasheet, MAX709REPA pinout, MAX709REPA application, or MAX709REPA equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), guaranteed minimum reset timeout (140ms), immunity to short negative VCC transients (<40µs at 100mV overdrive), and compatibility with 8-pin DIP packaging for through-hole prototyping and industrial control boards.
Technical Context
The MAX709REPA integrates a precision voltage comparator, internal timing capacitor, and open-drain RESET driver. Its reset threshold is factory-trimmed to 2.63V ±2.5%, with temperature coefficient of ±100ppm/°C, enabling stable brownout detection across –40°C to +85°C operation.
It features no external components required for basic reset functionality, supports bidirectional µP reset pins via series resistor interface, and maintains RESET validity during VCC ramp-up/down without external pull-ups-leveraging internal logic that ensures correct output state even as supply drops to 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH Nominal | 2.63V - precise brownout detection point for 3V/3.3V systems |
| Reset Timeout | ≥140ms - ensures µP completes full initialization before release |
| Supply Range | 1.0V to 5.5V - enables monitoring down to near-zero VCC for fail-safe behavior |
| Supply Current | 35µA (TYP) - ultra-low quiescent draw for battery-backed or energy-sensitive designs |
| RESET Output | Open-drain, 20mA sink - compatible with standard CMOS/TTL inputs and flexible pull-up configuration |
| Temp Range | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
| Package | 8-pin plastic DIP - through-hole mounting for prototyping, legacy PCBs, and high-reliability assemblies |
Pinout & Package
MAX709REPA is housed in an 8-pin plastic DIP package (0.300" wide), with pin 1 in top-left corner when notch faces up. Pin 1 and pins 4–8 are no-connect (N.C.) internally; functional terminals are limited to VCC (pin 2), GND (pin 3), and RESET (pin 7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 2 (VCC) | Positive supply input | Accepts 1.0V–5.5V; powers internal comparator and timer; must be bypassed with 0.1µF capacitor |
| Pin 3 (GND) | Ground reference | Common return path for VCC and RESET; substrate tied to VCC per chip topography |
| Pin 7 (RESET) | Active-low reset output | Open-drain output asserted low during power failure; requires external pull-up for logic-high state |
| Pins 1,4,5,6,8 | No connect | No internal connection; must remain unconnected or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.63V ±2.5% over –40°C to +85°C - eliminates need for external resistor divider calibration |
| Guaranteed reset timeout | 140ms min power-on delay - meets µP reset timing requirements without external RC network |
| Low-voltage operation | Valid RESET output down to VCC = 1V - ensures deterministic reset assertion during deep brownout |
| Transient immunity | Immune to ≤40µs negative VCC glitches at 100mV overdrive - prevents false resets in noisy power rails |
| Zero-component supervision | No external capacitors, resistors, or diodes required - reduces BOM count and board area in cost-sensitive designs |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
Use Scenario: Power cycling during field firmware updates in programmable logic controllers with isolated I/O modules. IC Role / Device Role / Timing Role: Supervises 3.3V core rail and asserts system-wide reset to prevent partial register writes during voltage sag. Use Value: 140ms guaranteed reset hold time ensures FPGA configuration completes before CPU release; N.C. pins simplify layout in space-constrained DIN-rail enclosures. | Use Scenario: Battery-powered portable ultrasound device with dual-voltage rails (3.3V digital, 5V analog front-end). IC Role / Device Role / Timing Role: Monitors 3.3V domain and triggers controlled shutdown when Li-ion drops below 3.0V, using 2.63V threshold to reserve margin for transient recovery. Use Value: 35µA supply current extends battery life; DIP package allows manual rework during clinical trial hardware iterations. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Cold-cranking event where battery dips to 6V while engine cranks, causing 5V regulator output to sag. IC Role / Device Role / Timing Role: Detects 5V rail collapse below 2.63V and holds microcontroller in reset until stable post-crank. Use Value: Immunity to <40µs negative transients prevents spurious resets during alternator switching noise; –40°C to +85°C rating matches under-dash thermal profile. | Use Scenario: Tamper-resistant electricity meter with backup SRAM and real-time clock powered by supercapacitor. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and asserts reset if voltage drops during grid outage, enabling graceful save-to-EEPROM sequence. Use Value: Valid RESET down to VCC = 1V ensures last-write integrity even as supercapacitor discharges to endpoint; DIP footprint supports automated optical inspection on meter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RPA | Same 2.63V threshold, but includes manual reset input (MR) pin | Required where operator-initiated reset (e.g., front-panel button) is needed alongside power supervision | Select MAX706RPA only if MR functionality is mandatory; MAX709REPA saves one PCB trace and simplifies routing |
| TPS3808G12DBVR | 2.63V threshold, 200ms reset timeout, 1.8V–6.0V supply range, SOT-23-5 package | Preferred for space-constrained, high-volume consumer designs requiring surface-mount assembly | Choose TPS3808G12DBVR for density-critical layouts; MAX709REPA remains optimal for through-hole reliability and manual serviceability |
Compared with MAX706RPA and TPS3808G12DBVR, the MAX709REPA delivers identical reset threshold accuracy and industrial temperature support in a proven DIP package-ideal for applications prioritizing ease of prototyping, field repair, and long-term component availability over miniaturization or manual reset capability.
Availability
MAX709REPA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and smart energy meters requiring stable component supply and long-lifecycle support.
Supply support for MAX709REPA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX709 family was engineered specifically for cost-sensitive, high-reliability microprocessor supervision-delivering precision reset thresholds, guaranteed timing, and zero-component operation in legacy-compatible packages.
FAQ
What is the exact reset threshold voltage for MAX709REPA?
The MAX709REPA has a nominal reset threshold voltage of 2.63V, with a tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). This value is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix R. The threshold remains stable with a temperature coefficient of ±100ppm/°C, ensuring consistent brownout detection across environmental conditions. MAX709REPA does not require external calibration to achieve this accuracy.
Does MAX709REPA require external components to function as a reset supervisor?
No, MAX709REPA operates as a complete reset supervisor with zero external components required for basic functionality. It integrates the voltage reference, comparator, timing circuit, and output driver. A 0.1µF bypass capacitor on VCC (pin 2) is recommended for transient immunity but not strictly required for DC operation. No pull-up resistor is mandatory-though one is needed on RESET (pin 7) to establish a logic-high state when the output is inactive.
Can MAX709REPA drive a microprocessor's reset pin directly?
Yes, MAX709REPA can drive most µP reset pins directly via its open-drain RESET output (pin 7), provided the µP accepts an active-low, open-drain-compatible input. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor between MAX709REPA's RESET and the µP pin is required to prevent contention. The MAX709REPA sink capability (20mA) exceeds typical µP reset input current requirements.
What is the minimum VCC voltage at which MAX709REPA guarantees correct RESET output state?
MAX709REPA guarantees correct RESET output state down to VCC = 1.0V. Below this voltage, the RESET output becomes high-impedance (open circuit) rather than undefined. This behavior is explicitly characterized and ensures predictable system behavior during deep brownout. For applications requiring RESET validity all the way to 0V, a 100kΩ pull-down resistor on the RESET line is recommended per Maxim's Applications Information.
Is MAX709REPA pin-compatible with other MAX709 variants like MAX709CPA or MAX709EUA?
No-MAX709REPA is not pin-compatible with MAX709CPA (SO-8) or MAX709EUA (µMAX-8). While all share identical functional pin assignments (VCC, GND, RESET, N.C.), the physical package differs: MAX709REPA uses 8-pin plastic DIP (0.300" width), whereas CPA is SO-8 and EUA is µMAX-8. Layouts must be redesigned for package change; no PCB reuse is possible without adapter or redesign. Pin 1 location and pitch differ across these packages.
MAX709REPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX709REPA FAQ
1.How can I place an order for MAX709REPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709REPA 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 MAX709REPA reliable?
The price and inventory of MAX709REPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709REPA is usually 5 days.
3.What payment methods are accepted for MAX709REPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709REPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709REPA?
MAX709REPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709REPA 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 MAX709REPA?
For technical support, including MAX709REPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709REPA requirements.
6.How does Aetrix verify that MAX709REPA is sourced from the original manufacturer or authorized distributors?
All MAX709REPA 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 MAX709REPA meets industry standards.
7.What is the process for return or replacement of MAX709REPA?
All MAX709REPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX709REPA, 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 MAX709REPA part is unused and in its original packaging.
Return procedure for MAX709REPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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