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Analog Devices Inc./Maxim Integrated MAX707CSA+T
- Part No.:
- MAX707CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX707CSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
The MAX707CSA+T from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, power-fail monitoring, manual-reset input, and watchdog timer disable (replaced by active-high RESET). It asserts RESET when VCC drops below 4.65V, delivers a guaranteed 200ms reset pulse width, and maintains valid RESET down to VCC = 1V - used in embedded controllers and industrial instrumentation for reliable power-up sequencing and brownout recovery.
For engineers reviewing the MAX707CSA+T datasheet, MAX707CSA+T pinout, MAX707CSA+T application, or MAX707CSA+T equivalent, this page delivers verified electrical parameters, package mapping to 8-pin SO, functional distinctions from MAX705/MAX706, and real-world use cases in critical μP power monitoring systems where deterministic reset timing and low-voltage validity are required.
Technical Context
The MAX707CSA+T integrates four core supervisory functions: precision 4.65V supply-voltage monitoring with 40mV hysteresis, debounced TTL/CMOS-compatible active-low manual-reset input (MR), 1.25V threshold power-fail comparator (PFI/PFO), and active-high RESET output replacing the watchdog timer found in MAX705/MAX706. Unlike its watchdog-equipped siblings, it omits WDI/WDO pins and substitutes RESET for WDO on Pin 8.
Its internal reset generator guarantees logic-valid RESET output at VCC ≥ 1V, supports reset assertion during power-down until VCC falls below 1V, and provides 250μA internal MR pull-up current. The PFI comparator operates independently of VCC regulation and enables early-warning detection for +5V or auxiliary supplies via external voltage dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset during brownout on +5V systems; matches standard TTL/CMOS logic supply tolerance. |
| Reset Pulse Width | 200ms nominal - ensures full μP initialization and memory stabilization before release. |
| Supply Voltage Range | 1.0V to 5.5V - enables valid reset assertion even during deep brownout or battery backup operation. |
| Power-Fail Threshold | 1.25V ±50mV - allows precise early-warning detection of +5V rail collapse using simple resistor divider. |
| Manual-Reset Input Current | 250μA pull-up - eliminates need for external pull-up; compatible with pushbutton switches and CMOS logic drivers. |
| Quiescent Supply Current | 50μA to 350μA - minimizes standby power draw in battery-backed systems. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control applications. |
Pinout & Package
MAX707CSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (+ suffix), footprint-compatible with industry-standard SOIC-8 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-Low Manual-Reset Input | Triggers 200ms RESET pulse when pulled below 0.8V; internally pulled up with 250μA current. |
| 2 VCC | +5V Supply Input | Primary power source; RESET remains valid down to 1.0V supply level. |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance. |
| 4 PFI | Power-Fail Input | Monitors external voltage via 1.25V comparator; asserts PFO low when input < 1.25V. |
| 5 PFO | Power-Fail Output | Open-drain active-low output; used for NMI interrupt or system shutdown signaling. |
| 6 RESET | Active-High Reset Output | Inverted logic version of RESET; drives high after 200ms delay post-VCC rise above 4.65V. |
| 7 RESET | Active-Low Reset Output | Standard μP reset signal; guaranteed low ≤0.4V at ISINK = 3.2mA; asserted until VCC > 4.65V + hysteresis. |
| 8 N.C. | No Connect | Unused pin; electrically isolated - no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at VCC = 1V | Enables fail-safe reset assertion during severe brownout or battery-depleted conditions. |
| 200ms Reset Pulse Width | Meets minimum reset duration requirements for Intel 80C51, ARM Cortex-M0+, and similar μPs. |
| 1.25V Precision Power-Fail Comparator | Supports configurable early-warning detection for +5V, +12V, or negative rails without external references. |
| Debounced Manual-Reset Input | Eliminates need for external RC debounce circuitry; compatible with mechanical switches and logic-level signals. |
| 40mV Reset Threshold Hysteresis | Prevents oscillatory reset assertion during slow VCC ramp-up or noise-induced threshold crossings. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power cycling during firmware update in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to hold CPU in known state until +5V rail stabilizes post-power-on. Use Value: Prevents corrupted register writes and flash programming errors by guaranteeing 200ms minimum reset hold time at VCC ≥ 1V. |
Use Scenario: Battery-backed data acquisition module requiring orderly shutdown upon AC loss. IC Role / Device Role / Timing Role: PFI monitors +5V rail via voltage divider; PFO triggers NMI interrupt to initiate safe memory save before power collapse. Use Value: 1.25V comparator accuracy enables 50mV margin before +5V dropout, allowing ≥200ms warning window for nonvolatile storage. |
| Automotive Infotainment Head Unit | Network Router Control Board |
Use Scenario: Cold-cranking condition where battery voltage dips to 6–7V, causing 5V LDO output to sag. IC Role / Device Role / Timing Role: MAX707CSA+T monitors LDO output; RESET holds SoC in reset until rail recovers above 4.65V + hysteresis. Use Value: 40mV hysteresis prevents chatter during marginal voltage recovery; 1V validity ensures reset remains asserted through worst-case sag. |
Use Scenario: Dual-supply system with +5V main rail and +3.3V I/O rail, requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: RESET output drives reset tree; PFI monitors +3.3V rail via resistor divider to assert PFO if I/O supply fails first. Use Value: Independent PFI comparator enables fault-isolation between power domains without adding discrete comparators or voltage references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705CSA+T | Includes watchdog timer (WDI/WDO); active-low RESET only; 4.65V threshold; no RESET pin. | Required where software watchdog timeout recovery is needed; unsuitable if active-high reset is mandatory. | Select MAX705CSA+T only when watchdog functionality is essential and μP accepts active-low reset. |
| MAX813LCSA+ | Identical 4.65V threshold and 200ms pulse width; includes watchdog timer; active-high RESET only (no RESET). | Used where watchdog is required but active-low reset is unnecessary; lacks dual-reset capability of MAX707. | Choose MAX813LCSA+ when system design uses only active-high reset and requires watchdog supervision. |
Compared with MAX705CSA+T and MAX813LCSA+, the MAX707CSA+T uniquely provides both active-high and active-low reset outputs without watchdog circuitry - making it optimal for systems needing dual-reset signaling (e.g., legacy + modern μP coexistence) while minimizing complexity and BOM count.
Availability
MAX707CSA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive infotainment head units, and network router control boards requiring stable component supply across extended production lifecycles.
Supply support for MAX707CSA+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 precision analog and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on reliability and integration.
The MAX705–MAX708 family was engineered specifically for cost-sensitive microprocessor supervisory tasks - delivering reset, power-fail warning, manual reset, and watchdog functions in single-chip solutions for embedded control systems.
FAQ
What is the reset threshold voltage of the MAX707CSA+T?
The MAX707CSA+T has a nominal reset threshold of 4.65V with ±150mV tolerance and 40mV hysteresis. It asserts RESET when VCC falls below this threshold and releases it 200ms after VCC rises above 4.65V + hysteresis. This value is factory-trimmed and guaranteed across temperature and supply variations, ensuring consistent behavior in +5V systems.
Does the MAX707CSA+T include a watchdog timer?
No, the MAX707CSA+T does not include a watchdog timer. Unlike the MAX705CSA+T or MAX813LCSA+, the MAX707CSA+T replaces the watchdog input/output (WDI/WDO) functionality with an active-high RESET output (Pin 6). Its pinout omits WDI and uses Pin 8 as N.C., confirming absence of watchdog circuitry per Maxim's official datasheet.
What is the purpose of the PFI and PFO pins on the MAX707CSA+T?
The PFI (Power-Fail Input) pin connects to a voltage divider monitoring any DC supply; when voltage at PFI drops below 1.25V, the open-drain PFO (Power-Fail Output) pulls low. This enables early-warning detection for +5V, +12V, or negative rails - allowing the host μP to execute controlled shutdown before complete power loss. PFO can drive NMI interrupts or external logic.
Can the MAX707CSA+T operate with supply voltages below 5V?
Yes, the MAX707CSA+T operates from 1.0V to 5.5V and guarantees valid RESET output down to VCC = 1V. Its internal reset generator remains functional at low supply levels, enabling use in battery-backed systems or during deep brownout conditions where other supervisors may fail to assert reset reliably.
What package type is used for the MAX707CSA+T?
The MAX707CSA+T is supplied in an 8-pin SO (Small Outline) package with lead-free/RoHS-compliant finish, indicated by the "+" suffix. It uses standard SOIC-8 footprint (package code S8+2), with 1.27mm pitch and JEDEC MS-012AC outline - compatible with automated SMT assembly and reflow processes.
MAX707CSA+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, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX707CSA+T FAQ
1.How can I place an order for MAX707CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707CSA+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 MAX707CSA+T reliable?
The price and inventory of MAX707CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707CSA+T is usually 5 days.
3.What payment methods are accepted for MAX707CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707CSA+T?
MAX707CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707CSA+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 MAX707CSA+T?
For technical support, including MAX707CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707CSA+T requirements.
6.How does Aetrix verify that MAX707CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX707CSA+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 MAX707CSA+T meets industry standards.
7.What is the process for return or replacement of MAX707CSA+T?
All MAX707CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX707CSA+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 MAX707CSA+T part is unused and in its original packaging.
Return procedure for MAX707CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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