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Analog Devices Inc./Maxim Integrated MAX6705YKA
- Part No.:
- MAX6705YKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705YKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:609
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Product details
Overview
MAX6705YKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with 1.6s timeout, 0.62V power-fail comparator input (PFI), and active-low manual reset input (MR). It monitors a single supply voltage (2.19V nominal threshold) and ensures reliable µP startup, brownout recovery, and system-level fault detection in embedded controllers.
For engineers reviewing the MAX6705YKA datasheet, MAX6705YKA pinout, MAX6705YKA application, or MAX6705YKA equivalent, this device delivers precision reset assertion down to VCC = 1V, guaranteed reset validity during fast transients, and integrated power-fail warning for orderly shutdown-critical for automotive ECUs, industrial PLCs, and telecom power management systems.
Technical Context
The MAX6705YKA implements a dual-comparator architecture: one fixed-threshold monitor for VCC (2.19V ±1.5%) and a separate 0.62V reference-based comparator for PFI, enabling independent early-warning power-fail detection. Its watchdog timer resets on any WDI edge within 1.6s (±12% over temperature) and asserts WDO independently of RESET.
Reset generation uses a 140ms timeout delay after VCC rises above threshold, with immunity to sub-100ns MR glitches and guaranteed VOL ≤0.4V at ISINK = 3.2mA. The internal 50kΩ MR pullup enables direct pushbutton interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (typ), ±1.5% accuracy over -40°C to +125°C - sets precise brownout detection point for 2.5V/3.3V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms range - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust activity monitoring without false triggers |
| PFI Threshold | 0.62V (typ), 6mV hysteresis - enables accurate power-fail warning via external resistor divider |
| Supply Current | 9–20µA at VCC < 3.6V - supports ultra-low-power battery-backed applications |
| Operating Voltage Range | 1.2V to 5.5V - guarantees reset validity even during deep brownout (down to 1V) |
| Output Type | Active-low push-pull RESET and WDO - eliminates need for external pullups in most µP interfaces |
Pinout & Package
MAX6705YKA is housed in an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm), RoHS-compliant, with lead-free option available (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pullup; forces reset when pulled low; deasserts WDO in A-version |
| 2 VCC | Supply voltage and primary reset monitor input | Powers internal circuitry; threshold detector triggers RESET when falling below 2.19V |
| 3 GND | Ground reference | Common return path for all analog and digital functions; required for accurate threshold sensing |
| 4 PFI | Power-fail input | High-impedance node connected to 0.62V internal reference; used with external divider to set custom trip voltage |
| 5 PFO | Power-fail output | Active-low open-drain output asserted when PFI < 0.62V; drives µP interrupt or backup controller |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge clears watchdog timer; 50ns minimum pulse width supported |
| 7 RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, or MR activation; holds for 140ms after recovery |
| 8 WDO | Active-low watchdog output | Independent push-pull output asserted on watchdog timeout or VCC/RST_IN undervoltage; latched in standard version |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset operation down to VCC = 1V | Ensures deterministic µP reset state even during severe brownout conditions |
| Immunity to short VCC transients (<100ns) | Prevents spurious resets from power rail noise or switching spikes |
| Independent PFI/PFO comparator | Enables early power-fail warning without affecting main reset timing or logic |
| 140ms reset timeout with temperature stability | Provides consistent µP initialization window across full industrial temperature range |
| Internal MR pullup resistor (50kΩ) | Eliminates external component count for pushbutton reset implementation |
| Low quiescent current (9–20µA) | Extends battery life in always-on monitoring applications such as telematics or sensor nodes |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
|
Use Scenario: Monitors 2.2V core supply and 5V I/O rail in engine management system under wide temperature (-40°C to +125°C) and vibration stress. IC Role / Device Role / Timing Role: Provides fail-safe reset during cranking-induced brownout and generates NMI via WDO on µP lockup. Use Value: Prevents undefined ECU behavior during cold-start voltage sag; 2.19V threshold matches 2.2V regulator dropout spec. |
Use Scenario: Supervises 3.3V FPGA configuration supply and 2.5V auxiliary rail in modular I/O chassis with redundant power inputs. IC Role / Device Role / Timing Role: Asserts RESET on primary supply failure while using PFI/PFO to trigger backup power switchover and graceful I/O shutdown. Use Value: Enables seamless hot-swap capability without firmware intervention; 0.62V PFI reference allows precise trip point setting for 3.3V rail. |
| Telecom Base Station Power Management | White Goods Microcontroller System |
|
Use Scenario: Embedded in DC-DC converter module to monitor 12V input and 3.3V output rails in 4G/LTE remote radio head. IC Role / Device Role / Timing Role: Generates watchdog-triggered reset pulses via WDO→MR feedback loop to recover locked µP without full power cycle. Use Value: Reduces mean time to repair (MTTR) by enabling autonomous recovery; 1.6s watchdog period avoids false triggers from burst traffic loads. |
Use Scenario: Controls reset sequencing for main MCU and display driver in smart refrigerator with variable AC line conditions. IC Role / Device Role / Timing Role: Uses MR input for door-open-initiated soft reset and PFO to signal impending compressor shutdown to cloud interface. Use Value: Supports energy-efficient standby mode with <20µA supply current; manual reset eliminates need for dedicated reset IC in cost-sensitive BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705TKA | 3.08V reset threshold vs. MAX6705YKA's 2.19V; identical pinout, timing, and feature set | Suitable for 3.3V systems requiring higher trip point; not interchangeable without adjusting power rail design | Select MAX6705TKA only if supervising ≥3.0V supplies; otherwise MAX6705YKA remains optimal for 2.2–2.5V rails |
| TPS3808G12DBVR | 1.2V reset threshold, 200ms timeout, no integrated PFI/PFO comparator, different pinout (SOT23-6) | Lacks power-fail warning capability; requires external components for multi-rail monitoring | Choose TPS3808G12DBVR only for simple single-rail reset where PFI/PFO functionality is unnecessary and board space is constrained |
Compared with MAX6705TKA and TPS3808G12DBVR, the MAX6705YKA uniquely combines 2.19V precision reset, integrated 0.62V PFI/PFO, and independent WDO in an 8-pin SOT23-enabling compact, feature-complete supervision for low-voltage embedded systems without layout or BOM compromise.
Availability
MAX6705YKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and telecom base station power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705YKA 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 MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision-delivering integrated reset, watchdog, power-fail warning, and manual reset in minimal footprint for space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for MAX6705YKA?
The MAX6705YKA has a nominal VCC reset threshold of 2.19V, with ±1.5% tolerance over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed at wafer test and confirmed per the Threshold Suffix Guide where "Y" denotes 2.19V. The MAX6705YKA maintains this accuracy without external calibration components.
Does MAX6705YKA support watchdog timer disable?
No, the MAX6705YKA watchdog timer cannot be disabled. It continuously monitors the WDI pin and asserts WDO if no valid edge occurs within 1.6s (typ). The timer clears automatically on VCC rise above threshold, MR assertion, or any WDI transition. This design ensures fail-safe behavior-no software or hardware method exists to disable the watchdog function in MAX6705YKA.
Can MAX6705YKA monitor multiple supply voltages simultaneously?
The MAX6705YKA monitors only one primary supply (VCC) with its fixed 2.19V threshold. However, it supports secondary voltage monitoring via the PFI pin: connecting an external resistor divider to PFI allows detection of any voltage that drops below 0.62V (e.g., 3.3V rail at ~10:1 divider ratio). It does not support triple-voltage monitoring like MAX6701(A)–MAX6703(A) variants.
What is the function of the PFO pin on MAX6705YKA?
The PFO (Power-Fail Output) pin on MAX6705YKA is an active-low open-drain output that asserts when the voltage at PFI falls below the internal 0.62V reference. It provides early warning of impending power loss-typically used to trigger µP interrupts for data save or controlled shutdown. PFO requires an external pullup resistor (e.g., 10kΩ to VCC) and sinks up to 3.2mA when asserted.
Is MAX6705YKA pin-compatible with other MAX670x devices?
Yes, MAX6705YKA shares the same 8-pin SOT23-8 pinout as all MAX6701–MAX6708 variants, including MAX6705A, MAX6706, and MAX6707. Pin functions (MR, VCC, GND, PFI, PFO, WDI, RESET, WDO) are identical across the family. However, functional differences exist-e.g., MAX6708 lacks WDI/WDO, and MAX6704 has complementary RESET outputs-so electrical compatibility must be verified per application requirements.
MAX6705YKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.19V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6705YKA FAQ
1.How can I place an order for MAX6705YKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705YKA 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 MAX6705YKA reliable?
The price and inventory of MAX6705YKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705YKA is usually 5 days.
3.What payment methods are accepted for MAX6705YKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705YKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705YKA?
MAX6705YKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705YKA 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 MAX6705YKA?
For technical support, including MAX6705YKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705YKA requirements.
6.How does Aetrix verify that MAX6705YKA is sourced from the original manufacturer or authorized distributors?
All MAX6705YKA 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 MAX6705YKA meets industry standards.
7.What is the process for return or replacement of MAX6705YKA?
All MAX6705YKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705YKA, 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 MAX6705YKA part is unused and in its original packaging.
Return procedure for MAX6705YKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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