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Analog Devices Inc./Maxim Integrated MAX6705ALKA+T
- Part No.:
- MAX6705ALKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705ALKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,717
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Product details
Overview
MAX6705ALKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with 1.6s timeout, adjustable 0.62V power-fail comparator (PFI/PFO), and manual reset input. It monitors +3.3V/+2.5V systems in industrial controllers and telecom equipment where reliable brownout detection and fail-safe reset timing are critical.
For engineers reviewing the MAX6705ALKA+T datasheet, MAX6705ALKA+T pinout, MAX6705ALKA+T application, or MAX6705ALKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset threshold (3.08V nominal), guaranteed operation down to VCC = 1V, and validated alternative options for voltage supervision in embedded control and networking hardware.
Technical Context
The MAX6705ALKA+T implements a dedicated reset generator with internal 140ms timeout delay, a separate watchdog timer that asserts WDO low upon 1.6s WDI inactivity, and an independent power-fail comparator with 0.62V reference and 6mV hysteresis. Its reset logic responds to VCC falling below the factory-trimmed 3.08V threshold (±3% over –40°C to +125°C), MR assertion, or PFI undervoltage - all while maintaining guaranteed RESET validity down to VCC = 1V.
This A-version variant features nonlatching WDO behavior: WDO deasserts immediately when VCC, RST_IN1, or RST_IN2 recovers above threshold (unlike standard versions), and also clears on valid WDI edge or MR low pulse. It excludes RST_IN1/RST_IN2 pins, confirming its single-voltage supervision role per datasheet pinout and selector guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (nominal), ±3% over –40°C to +125°C - sets precise brownout detection point for +3.3V rails |
| Reset Timeout Delay | 140ms (min) - ensures µP remains held in reset long enough for stable power-up sequencing |
| Watchdog Timeout | 1.6s (typical) - provides fail-safe recovery window for firmware hang detection |
| Power-Fail Threshold | 0.62V (typical) with 6mV hysteresis - enables accurate early-warning monitoring of auxiliary supplies via external divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and compatibility with 1.8V–5V system domains |
| Reset Output Type | Active-low push-pull - drives reset line directly without external pull-up; sinks 3.2mA at VCC ≥ 4.25V |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom base station environments |
Pinout & Package
MAX6705ALKA+T is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset for ≥1µs and clears watchdog timer |
| 2 - VCC | Supply voltage and primary reset monitor input | Powers internal circuitry and serves as main reset trigger source; valid operation starts at VCC = 1.2V |
| 3 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 4 - PFI | Power-fail voltage monitor input | High-impedance (≤200nA leakage) node for external resistive divider; trips at 0.62V threshold |
| 5 - PFO | Power-fail monitor output | Active-low push-pull output asserting when PFI < 0.62V; sinks 3.2mA at VCC ≥ 4.25V |
| 6 - WDI | Watchdog timer input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; 50ns minimum pulse width |
| 7 - RESET | Active-low reset output | Push-pull driver asserted low during power-up, brownout, MR activation, or watchdog timeout; valid to VCC = 1V |
| 8 - WDO | Active-low watchdog output | Independent open-drain or push-pull output (A-version: nonlatching, clears on recovery or WDI edge) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion even during severe brownout conditions before supply collapse |
| 140ms reset timeout delay | Meets JEDEC JESD82-1 specification for µP reset hold time, preventing premature release |
| Independent power-fail comparator (PFI/PFO) | Enables early warning of secondary supply failure (e.g., backup battery, I/O rail) without affecting main reset timing |
| Nonlatching watchdog output (A-version) | WDO deasserts immediately upon VCC recovery or WDI edge - eliminates spurious NMI lockups in noisy systems |
| Immunity to short VCC transients | Rejects <100ns supply glitches, preventing false resets during switching noise or ESD events |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
|
Use Scenario: Monitoring +3.3V core supply in programmable logic controllers with dual-rail DC-DC converters. IC Role / Device Role / Timing Role: Primary reset supervisor ensuring µP initialization only after both main and auxiliary rails stabilize. Use Value: Prevents firmware corruption during cold-start by enforcing 140ms reset hold and detecting sub-3.08V brownout before logic fails. |
Use Scenario: Early warning of -48V DC feed degradation in LTE base station power modules. IC Role / Device Role / Timing Role: Power-fail detector using PFI divider to trigger PFO interrupt 50ms before regulator dropout. Use Value: Enables orderly shutdown of RF amplifiers and memory save routines via µP NMI, avoiding data loss. |
| White Goods MCU Supervision | Networking Equipment |
|
Use Scenario: Reset coordination in smart refrigerator mainboard with variable-speed compressor and display MCU. IC Role / Device Role / Timing Role: Single-point reset generator synchronizing application MCU, sensor hub, and communication interface. Use Value: Eliminates need for discrete RC reset circuits; reduces BOM count by 4 components while improving temperature stability (±3% threshold). |
Use Scenario: Watchdog supervision of packet-processing ASIC in enterprise switches with thermal throttling. IC Role / Device Role / Timing Role: Independent watchdog timer monitoring ASIC activity via WDI signal, asserting WDO on stall. Use Value: Provides hardware-level recovery path when firmware hangs due to thermal throttling-induced timing violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705LKA+T | Same pinout and function, but standard (non-A) version: WDO latches low on timeout and requires WDI edge to clear | Lacks immediate WDO recovery on VCC recovery; unsuitable where transient brownouts must not cause persistent watchdog fault signals | Select MAX6705LKA+T only if watchdog output must remain asserted until explicit firmware intervention |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO, no watchdog output | Provides basic reset only; cannot replace MAX6705ALKA+T's power-fail warning or watchdog functions | Choose TPS3808G33DBVR only for cost-sensitive designs requiring only reset supervision without PFI/PFO or watchdog capability |
Compared with MAX6705LKA+T, the MAX6705ALKA+T offers faster watchdog recovery and immunity to brownout-induced WDO lockup; versus TPS3808G33DBVR, it adds essential power-fail monitoring and watchdog safety layers required in mission-critical telecom and industrial control.
Availability
MAX6705ALKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, white goods MCU supervision, and networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705ALKA+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family targets compact, high-reliability microprocessor supervision in space-constrained embedded systems, emphasizing low quiescent current (9–25µA), wide operating voltage (1.2–5.5V), and guaranteed functionality down to VCC = 1V.
FAQ
What is the exact reset threshold voltage for MAX6705ALKA+T?
The MAX6705ALKA+T has a factory-trimmed reset threshold of 3.08V (nominal), with tolerance of ±3% over the full operating temperature range (–40°C to +125°C). This value corresponds to the "T" suffix in the Threshold Suffix Guide and is specified in the Electrical Characteristics table under VTH for MAX670_T/MAX670_AT variants.
Does MAX6705ALKA+T support monitoring multiple supply voltages?
No. The MAX6705ALKA+T monitors only the VCC supply voltage. Unlike MAX6701(A)–MAX6703(A) variants, it does not include RST_IN1 or RST_IN2 pins. Its pinout (confirmed in Pin Description and Selector Guide) contains only VCC, MR, PFI, PFO, WDI, RESET, and WDO - confirming single-supply supervision capability.
How does the watchdog behavior differ between MAX6705ALKA+T and MAX6705LKA+T?
The MAX6705ALKA+T (A-version) features nonlatching WDO: it deasserts immediately when VCC recovers above threshold or upon a valid WDI edge. In contrast, MAX6705LKA+T (standard version) latches WDO low until cleared by a WDI transition - making it susceptible to persistent fault signaling during brief brownouts.
Can MAX6705ALKA+T be used with a 2.5V supply rail?
Yes. The MAX6705ALKA+T operates over VCC = 1.2V to 5.5V and is explicitly rated for +2.5V systems per the General Description and Applications list. Its 3.08V reset threshold ensures reliable detection of brownout on a +3.3V rail; for +2.5V rails, select MAX6705RKA+T (2.63V threshold) or MAX6705SKA+T (2.93V threshold) instead.
What is the function of the PFI and PFO pins on MAX6705ALKA+T?
PFI is a high-impedance input referenced to an internal 0.62V comparator; connecting it via resistor divider to any system voltage allows early power-fail detection. PFO is the corresponding active-low push-pull output that asserts when PFI falls below 0.62V - enabling µP interrupt-driven graceful shutdown before complete supply collapse.
MAX6705ALKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6705ALKA+T FAQ
1.How can I place an order for MAX6705ALKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705ALKA+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 MAX6705ALKA+T reliable?
The price and inventory of MAX6705ALKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705ALKA+T is usually 5 days.
3.What payment methods are accepted for MAX6705ALKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705ALKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705ALKA+T?
MAX6705ALKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705ALKA+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 MAX6705ALKA+T?
For technical support, including MAX6705ALKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705ALKA+T requirements.
6.How does Aetrix verify that MAX6705ALKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6705ALKA+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 MAX6705ALKA+T meets industry standards.
7.What is the process for return or replacement of MAX6705ALKA+T?
All MAX6705ALKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705ALKA+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 MAX6705ALKA+T part is unused and in its original packaging.
Return procedure for MAX6705ALKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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