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Analog Devices Inc./Maxim Integrated MAX709LCSA+T
- Part No.:
- MAX709LCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709LCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
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Product details
Overview
MAX709LCSA+T from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +5V systems requiring 4.65V reset threshold, 140ms minimum reset timeout, and operation down to VCC = 1V. It eliminates external components in microprocessor supervisory circuits and supports SO-8 packaging for space-constrained embedded designs.
For engineers reviewing the MAX709LCSA+T datasheet, MAX709LCSA+T pinout, MAX709LCSA+T application, or MAX709LCSA+T equivalent, key selection criteria include reset threshold accuracy (±150mV), temperature-stable delay timing, immunity to sub-40µs VCC glitches, and compatibility with 3.3V/5V µP reset inputs.
Technical Context
The MAX709LCSA+T integrates a precision voltage comparator with hysteresis and an internal timer to generate a guaranteed minimum 140ms active-low reset pulse after VCC rises above 4.65V. Its reset output remains valid down to VCC = 1V and exhibits no false triggering for negative VCC transients ≤40µs when overdriven by 100mV below threshold.
It operates across 0°C to +70°C, draws only 65µA typical supply current at VCC = 5.5V, and features open-drain RESET output capable of sinking 1.2mA at VCC ≥ reset threshold min - enabling direct interface with TTL, CMOS, and most µP reset pins without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V nominal (4.50V–4.75V range); ensures reliable reset assertion before +5V system brownout |
| Reset Timeout | 140ms min after VCC rise; guarantees µP initialization completes before code execution |
| Supply Current | 65µA typ at 5.5V; enables low-power battery-backed monitoring without burdening supply |
| VCC Range | 1.0V to 5.5V; supports valid RESET state during deep undervoltage and full-system power sequencing |
| Glitch Immunity | Rejects ≤40µs negative VCC transients 100mV below threshold; prevents spurious resets in noisy environments |
| Output Drive | Sinks 1.2mA at VCC ≥ 4.50V; directly drives standard µP reset inputs without external buffer |
| Operating Temp | 0°C to +70°C; qualified for commercial-grade industrial control and peripheral applications |
Pinout & Package
MAX709LCSA+T is supplied in an 8-pin SO (Small Outline) package, 150mil width, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect | Internally unconnected; must remain floating or grounded per layout best practice |
| 2 | VCC | Main supply input; accepts 1.0V–5.5V; requires local 0.1µF bypass capacitor |
| 3 | GND | Analog/digital ground reference; shared return path for reset comparator and timer |
| 7 | RESET | Active-low open-drain output; sinks current during reset; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.65V reset threshold | Matches +5V system brownout margin without trimming or calibration |
| 140ms minimum reset timeout | Exceeds typical µP power-on stabilization time, eliminating need for external RC timing |
| Valid RESET down to VCC = 1V | Ensures deterministic reset state during controlled power-down sequences |
| Immunity to short VCC glitches | Rejects noise spikes up to 40µs duration, reducing false resets in motor or switching supply environments |
| SO-8 lead-free packaging | Enables automated SMT assembly and meets IPC/JEDEC reflow profiles for commercial PCBs |
Applications
| Industrial PLC I/O Modules | POS Terminal Power Management |
|---|---|
Use Scenario: Monitoring 5V rail in programmable logic controller backplane modules subject to intermittent AC line sags and relay-induced transients. IC Role / Device Role / Timing Role: System-level power supervisor asserting active-low reset to ARM Cortex-M4 host MCU until stable 5V is confirmed. Use Value: Prevents firmware corruption during brownout recovery by enforcing 140ms minimum hold time after VCC exceeds 4.65V. | Use Scenario: Ensuring clean boot sequence in retail point-of-sale terminals powered from shared 5V DC adapters with marginal regulation. IC Role / Device Role / Timing Role: Primary reset generator interfacing directly to Intel Atom E3800-series processor reset pin via 4.7kΩ series resistor. Use Value: Eliminates external RC network while maintaining glitch immunity against adapter ripple and hot-plug transients. |
| Medical Diagnostic Peripheral | Networked Sensor Gateway |
Use Scenario: Supervising dual 5V/3.3V rails in ultrasound probe interface electronics where firmware integrity is safety-critical. IC Role / Device Role / Timing Role: Standalone reset source for FPGA configuration controller, asserting reset until both supplies stabilize. Use Value: Guarantees reset validity down to VCC = 1V, enabling safe shutdown detection even during rapid power collapse. | Use Scenario: Embedded gateway aggregating LoRaWAN sensor data, operating from unregulated 5V wall adapters in field deployments. IC Role / Device Role / Timing Role: Single-chip power monitor replacing discrete Zener + capacitor reset circuit in cost-sensitive design. Use Value: Reduces BOM count by 3 components and improves threshold accuracy from ±5% (discrete) to ±3.2% (MAX709LCSA+T). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706PESA+ | Same 4.65V threshold, but -40°C to +85°C temp range and SO-8 package | Required for extended-temperature industrial or outdoor deployments | Select MAX706PESA+ when operating outside 0°C–70°C range; otherwise MAX709LCSA+T offers lower cost for commercial use |
| TPS3808G33DBVR | 3.3V reset threshold, 200ms timeout, 1.5µA quiescent current, SOT-23-6 | Designed for ultra-low-power 3.3V systems; not interchangeable due to different threshold and package | Choose TPS3808G33DBVR only for 3.3V rail supervision with strict current budget; MAX709LCSA+T remains optimal for 5V/4.65V systems |
Compared with MAX706PESA+, MAX709LCSA+T trades extended temperature rating for lower unit cost in commercial environments; versus TPS3808G33DBVR, it provides higher reset threshold and proven robustness against VCC transients - critical for legacy 5V µP platforms.
Availability
MAX709LCSA+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, POS terminal power management, and medical diagnostic peripherals requiring stable component supply and long-term production continuity.
Supply support for MAX709LCSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX709 family was engineered specifically for cost-sensitive, single-rail microprocessor supervision - delivering precision reset functionality in minimal footprint without external passive components.
FAQ
What is the exact reset threshold voltage of MAX709LCSA+T?
The MAX709LCSA+T has a nominal reset threshold of 4.65V, with guaranteed limits of 4.50V (minimum) and 4.75V (maximum) across the full 0°C to +70°C operating range. This threshold is factory-trimmed and does not require external adjustment, making it ideal for +5V system brownout detection where margin above 4.5V is critical for reliable µP operation.
Does MAX709LCSA+T require an external pull-up resistor on the RESET pin?
Yes, MAX709LCSA+T features an open-drain RESET output and requires an external pull-up resistor to VCC or another logic supply. A typical value is 10kΩ to 100kΩ. Without this resistor, the RESET signal cannot achieve a defined high state, risking indeterminate behavior in µP reset circuits - especially those with bidirectional reset pins like the Motorola 68HC11 family.
Can MAX709LCSA+T operate with VCC below 3.0V?
Yes, MAX709LCSA+T functions down to VCC = 1.0V. Its RESET output remains valid (low-asserted or high-impedance) throughout this range, and the device draws only 65µA typical supply current at VCC = 5.5V. However, the reset timeout and threshold accuracy are specified only for VCC ≥ 1.0V - operation below 1.0V is undefined and may result in loss of RESET state integrity.
What is the maximum VCC transient duration that MAX709LCSA+T can ignore?
MAX709LCSA+T ignores negative-going VCC transients ≤40µs in duration when the transient magnitude is ≤100mV below its 4.65V reset threshold. This immunity is verified per Figure 1 in the datasheet and enables reliable operation in electrically noisy environments such as motor drive interfaces or switch-mode power supply proximity, without requiring additional filtering beyond the recommended 0.1µF bypass capacitor.
Is MAX709LCSA+T pin-compatible with other MAX709 variants like MAX709MCSA+T?
Yes, all MAX709 variants including MAX709LCSA+T, MAX709MCSA+T, and MAX709RCSA+T share identical SO-8 pinouts and electrical interfaces - differing only in reset threshold voltage (4.65V, 4.40V, or 2.63V respectively). No PCB layout change is required when substituting between these versions, provided the target system's supply rail voltage aligns with the selected threshold.
MAX709LCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX709LCSA+T FAQ
1.How can I place an order for MAX709LCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709LCSA+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 MAX709LCSA+T reliable?
The price and inventory of MAX709LCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709LCSA+T is usually 5 days.
3.What payment methods are accepted for MAX709LCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709LCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709LCSA+T?
MAX709LCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709LCSA+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 MAX709LCSA+T?
For technical support, including MAX709LCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709LCSA+T requirements.
6.How does Aetrix verify that MAX709LCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX709LCSA+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 MAX709LCSA+T meets industry standards.
7.What is the process for return or replacement of MAX709LCSA+T?
All MAX709LCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX709LCSA+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 MAX709LCSA+T part is unused and in its original packaging.
Return procedure for MAX709LCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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