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Analog Devices Inc./Maxim Integrated MAX705CSA-T
- Part No.:
- MAX705CSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX705CSA-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,488
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Product details
Overview
MAX705CSA-T from Maxim Integrated is a low-cost microprocessor supervisory circuit in 8-pin SO package, providing active-low reset output, 1.6s watchdog timeout, 4.65V supply-voltage monitoring threshold, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX705CSA-T datasheet, MAX705CSA-T pinout, MAX705CSA-T application, or MAX705CSA-T equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1V, 200ms reset pulse width, TTL/CMOS-compatible MR input, and compatibility with +5V µP systems requiring robust power-supply supervision without external components.
Technical Context
The MAX705CSA-T integrates four core supervisory functions on a single die: a precision voltage monitor with 4.65V ±150mV threshold and 40mV hysteresis, a monostable watchdog timer triggered by WDI edge transitions with 1.0–2.25s timeout range, a 1.25V reference-based power-fail comparator (PFI/PFO), and a 250µA internally pulled-up manual-reset input with 150ns minimum pulse width tolerance.
Its reset generator asserts active-low RESET for ≥140ms after VCC rises above threshold or MR release, maintains RESET low during brownout, and guarantees logic-low output (≤0.4V) at VCC ≥1V with ISINK = 3.2mA - enabling compatibility with legacy 5V µPs such as Intel 80C51 derivatives requiring deterministic reset timing under marginal supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset when +5V rail drops below safe µP operating level |
| Reset Pulse Width | 200ms typical - ensures full µP initialization before code execution resumes |
| Watchdog Timeout | 1.6s nominal - detects µP lockup without requiring software polling |
| Power-Fail Input Threshold | 1.25V ±50mV - enables early warning of supply degradation via external resistor divider |
| Supply Current | 150–350µA - supports low-power operation in battery-backed systems |
| RESET Valid Down To | VCC = 1V - guarantees reset assertion during deep brownout or slow power ramp |
| MR Input Pull-Up | 250µA internal - eliminates need for external pull-up resistor on manual reset switch |
Pinout & Package
MAX705CSA-T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and standard JEDEC MS-012AC outline. Pin 1 is marked with dot or bevel; device orientation follows standard SO top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger with 250µA internal pull-up; debounced by ≥140ms reset pulse |
| 2 (VCC) | +5V Supply Input | Primary power rail connection; operates from 1.0V to 5.5V with guaranteed RESET down to 1V |
| 3 (GND) | Ground Reference | Common return for all analog and digital functions; must be low-impedance path to system ground |
| 4 (PFI) | Power-Fail Input | Comparator non-inverting input referenced to 1.25V; monitors auxiliary supplies or battery voltage via external divider |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output signaling PFI < 1.25V; sinks current to assert interrupt or initiate orderly shutdown |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; floating disables watchdog |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserting low for ≥140ms during power-up/brownout/manual trigger; drives µP reset pin directly |
| 8 (WDO) | Watchdog Output | Open-drain active-low output that goes low on timeout or VCC undervoltage; no minimum pulse width guarantee |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Supervisory Functions | Combines reset generation, watchdog timer, power-fail detection, and manual reset in one 8-pin SO IC - reduces BOM count and PCB area vs. discrete solutions |
| Guaranteed RESET at Low VCC | Valid active-low RESET output down to VCC = 1V ensures µP remains held in reset during slow power ramp or deep brownout |
| Debounced Manual-Reset Input | 250µA internal pull-up and 140ms minimum reset pulse eliminate need for external RC debounce network |
| Precision Voltage Monitoring | 4.65V reset threshold with ±150mV tolerance and 40mV hysteresis prevents chatter near trip point during supply sag |
| Configurable Power-Fail Detection | 1.25V reference-based PFI allows monitoring of any DC voltage (e.g., +12V, -5V, battery) using external resistive divider |
Applications
| Industrial PLC Controllers | Embedded Data Acquisition Systems |
|---|---|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 24VDC supplies and EMI exposure. IC Role / Device Role / Timing Role: MAX705CSA-T provides brownout reset, watchdog supervision of firmware execution, and early power-fail warning to trigger data save before shutdown. Use Value: Prevents corrupted I/O state and firmware hangs during voltage sags; enables deterministic recovery without operator intervention. | Use Scenario: Portable environmental sensors logging temperature/humidity over extended periods using lithium backup. IC Role / Device Role / Timing Role: MAX705CSA-T monitors main +5V rail for µP reset, uses PFI to detect battery depletion via 1.25V threshold, and asserts PFO to initiate graceful data flush. Use Value: Extends usable battery life by avoiding premature shutdown; ensures integrity of last recorded measurement before power loss. |
| Medical Diagnostic Equipment | Telecom Line Cards |
Use Scenario: Ultrasound or patient monitor units requiring FDA-compliant power sequencing and fault response. IC Role / Device Role / Timing Role: MAX705CSA-T generates synchronized reset across multiple ASICs, monitors +5V and +3.3V rails (via PFI dividers), and feeds WDO to safety-critical watchdog interrupt. Use Value: Meets IEC 62304 power-fail response requirements; eliminates race conditions during multi-rail power-up sequences. | Use Scenario: Carrier-grade line cards with hot-swap capability and redundant power inputs. IC Role / Device Role / Timing Role: MAX705CSA-T supervises primary +5V supply, uses PFO to signal power-fail to management MCU, and resets control logic on undervoltage events. Use Value: Enables sub-200ms failover to backup supply; prevents packet loss during transient supply dips on telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CSA-T | 4.40V reset threshold (vs. 4.65V); otherwise identical pinout, features, and timing | Suitable for systems with tighter +5V tolerance or lower dropout regulators | Select MAX706CSA-T only if design requires reset assertion at lower supply voltage - not a drop-in replacement due to different threshold |
| MAX813LCSA-T | Active-high RESET output instead of active-low; same 4.65V threshold, 1.6s watchdog, and PFI/PFO functionality | Required for µPs with active-high reset inputs (e.g., certain ARM Cortex-M variants) | Choose MAX813LCSA-T when interfacing with µPs lacking active-low reset support - pin-compatible but logic polarity differs |
Compared with MAX706CSA-T, MAX705CSA-T asserts reset earlier during supply decay, improving margin for 5V systems with aging regulators; versus MAX813LCSA-T, it simplifies interface to legacy 8051/80C51 µPs but requires level-shifting for newer active-high-only processors.
Availability
MAX705CSA-T is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded data acquisition systems, medical diagnostic equipment, and telecom line cards requiring stable component supply across extended production lifecycles.
Supply support for MAX705CSA-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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX705–MAX708/MAX813L family delivers cost-optimized µP supervisory functions - targeting space-constrained, cost-sensitive embedded systems needing reliable power-up sequencing, brownout protection, and watchdog safety without external components.
FAQ
What is the reset threshold voltage of the MAX705CSA-T?
The MAX705CSA-T has a nominal reset threshold of 4.65V with a tolerance of ±150mV. This means RESET is asserted when VCC falls below approximately 4.50V and released after VCC rises above ~4.75V, with 40mV hysteresis preventing oscillation near the trip point. The threshold is factory-trimmed and guaranteed over temperature and supply variations.
Does the MAX705CSA-T support operation below 5V supply?
Yes, the MAX705CSA-T operates from VCC = 1.0V to 5.5V and guarantees valid active-low RESET output down to VCC = 1V with ISINK = 3.2mA. This enables reliable reset assertion during slow power ramps or deep brownout conditions where other supervisors may fail to hold the µP in reset.
How does the manual-reset input (MR) function on the MAX705CSA-T?
The MR pin on the MAX705CSA-T is an active-low, TTL/CMOS-compatible input with a 250µA internal pull-up current. Pulling MR below 0.8V triggers a 200ms reset pulse. Its 140ms minimum pulse width provides hardware debouncing, eliminating external RC networks. MR can also be driven by logic lines or pushbutton switches directly.
Can the MAX705CSA-T monitor voltages other than +5V?
Yes, the MAX705CSA-T's PFI pin accepts any DC voltage referenced to its 1.25V internal comparator threshold. By connecting a resistor divider from a target supply (e.g., +12V or battery) to PFI, users can configure early-warning power-fail detection. Adding hysteresis or filtering capacitors further enhances noise immunity for critical monitoring tasks.
Is the MAX705CSA-T pin-compatible with the MAX706CSA-T?
Yes, the MAX705CSA-T and MAX706CSA-T share identical 8-pin SO packaging, pinout, and functional block diagram - differing only in reset threshold (4.65V vs. 4.40V). However, they are not functionally interchangeable without verifying system-level voltage margin requirements, as the lower threshold of MAX706CSA-T may cause premature reset in 5V-tolerant designs.
MAX705CSA-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:
- Obsolete
- 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
MAX705CSA-T FAQ
1.How can I place an order for MAX705CSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705CSA-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 MAX705CSA-T reliable?
The price and inventory of MAX705CSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705CSA-T is usually 5 days.
3.What payment methods are accepted for MAX705CSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705CSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705CSA-T?
MAX705CSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705CSA-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 MAX705CSA-T?
For technical support, including MAX705CSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705CSA-T requirements.
6.How does Aetrix verify that MAX705CSA-T is sourced from the original manufacturer or authorized distributors?
All MAX705CSA-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 MAX705CSA-T meets industry standards.
7.What is the process for return or replacement of MAX705CSA-T?
All MAX705CSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX705CSA-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 MAX705CSA-T part is unused and in its original packaging.
Return procedure for MAX705CSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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