My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6703ASKA+T
- Part No.:
- MAX6703ASKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703ASKA+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,397
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6703ASKA+T from Maxim Integrated is an active-low, open-drain microprocessor supervisory circuit in 8-pin SOT23 package, monitoring three supply voltages (one fixed +3.08V VCC threshold and two adjustable via RST_IN1/RST_IN2), providing independent watchdog output (WDO) with 1.6s timeout, manual reset input (MR), and power-fail warning (PFI/PFO). It ensures reliable power-up/down/brownout reset for industrial controllers and intelligent instruments.
For engineers reviewing the MAX6703ASKA+T datasheet, MAX6703ASKA+T pinout, MAX6703ASKA+T application, or MAX6703ASKA+T equivalent, key selection criteria include its triple-voltage supervision capability, open-drain reset output, guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and compatibility with +3.3V/+2.5V system rails.
Technical Context
The MAX6703ASKA+T implements a dual-adjustable reset input architecture supporting simultaneous monitoring of VCC (fixed 3.08V threshold), RST_IN1, and RST_IN2 - each referenced to an internal 0.62V comparator - enabling robust triple-rail supervision in compact embedded systems. Its watchdog timer asserts WDO low after 1.6s of no WDI edge transition and clears on any valid WDI toggle or MR assertion.
Reset generation uses a 140ms timeout period following VCC, RST_IN1, or RST_IN2 undervoltage detection, with guaranteed RESET assertion down to VCC = 1V and immunity to sub-100ns VCC glitches. The open-drain RESET output supports flexible pull-up configurations, while PFI/PFO provide programmable early power-fail warning with <6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 3.08V (typ), ±3% over -40°C to +125°C - sets primary supply monitoring point for +3.3V systems |
| Reset Timeout Period | 140ms (min), 280ms (max) - ensures µP remains held in reset long enough for stable clock and memory initialization |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides sufficient time for firmware watchdog servicing without false triggers |
| Supply Current | 9–20µA at VCC < 3.6V - enables ultra-low-power operation in battery-backed or energy-constrained applications |
| PFI Threshold | 0.62V (typ), ±9mV over temperature - allows precise external voltage-divider-based monitoring of secondary rails down to 0.9V |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision from low-voltage logic rails up to legacy 5V systems |
| Reset Output Type | Active-low open drain - permits wired-OR configuration, level-shifting, and shared reset bus implementation |
Pinout & Package
MAX6703ASKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (indicated by "+T" suffix), suitable for high-density PCB layouts and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset and clears watchdog; unconnected = VCC |
| 2 VCC | Main supply input | Primary power rail monitored at 3.08V threshold; powers internal circuitry and push-pull outputs (not used here) |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; connects to external resistor divider for secondary rail monitoring |
| 5 PFO | Power-fail output | Open-drain active-low output asserted when PFI < 0.62V; used for early warning interrupt or cascaded reset initiation |
| 6 WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset 1.6s timer; static high/low for >1.6s asserts WDO |
| 7 RESET | Active-low reset output | Open-drain output asserted during VCC/RST_IN1/RST_IN2 undervoltage, MR low, or watchdog timeout; requires external pullup |
| 8 WDO | Active-low watchdog output | Open-drain output asserted independently on watchdog timeout or VCC/RST_IN1/RST_IN2 undervoltage; deasserts on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of two additional system rails (e.g., I/O and core) using external resistor dividers referenced to 0.62V |
| Independent watchdog output (WDO) | Provides dedicated fault signaling path separate from RESET, allowing NMI-driven error logging without disrupting main reset sequence |
| 140ms reset timeout delay | Guarantees minimum reset pulse width across full temperature range (-40°C to +125°C), meeting µP tRP requirements |
| 0.62V precision PFI threshold | Supports accurate power-fail detection on rails as low as 0.9V with minimal external components and <6mV hysteresis |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout conditions, preventing µP runaway before supply collapse |
Applications
| Industrial Controllers | Intelligent Instruments |
|---|---|
Use Scenario: PLCs and motor drives requiring coordinated reset across 3.3V I/O, 2.5V logic, and 1.8V core supplies. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting unified RESET and independent WDO for watchdog-triggered diagnostics. Use Value: Eliminates discrete RC networks and multiple ICs while maintaining fail-safe reset timing across voltage domains. |
Use Scenario: Portable test equipment with battery backup, where early PFI warning enables graceful shutdown before main supply collapse. IC Role / Device Role / Timing Role: Power-fail monitor generating PFO interrupt to initiate data save routines prior to VCC dropout. Use Value: 0.62V PFI threshold and <6mV hysteresis enable reliable early-warning detection even under noisy supply conditions. |
| Critical µP Power Monitoring | Networking Equipment |
Use Scenario: Base station control modules needing guaranteed reset assertion during rapid VCC transients caused by RF switching. IC Role / Device Role / Timing Role: Immune-to-glitch supervisor holding RESET asserted through 100ns VCC dips, with 140ms timeout recovery. Use Value: Prevents spurious µP resets during RF-induced supply noise, improving system uptime and diagnostic integrity. |
Use Scenario: Ethernet switches with multi-rail power architecture (3.3V PHY, 2.5V MAC, 1.2V SerDes) requiring synchronized reset sequencing. IC Role / Device Role / Timing Role: Single-chip triple-supply monitor driving shared open-drain RESET bus with configurable thresholds. Use Value: Reduces BOM count and layout area versus discrete supervisors, while ensuring simultaneous release across all voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703MSKA+T | Fixed 4.38V VCC reset threshold instead of 3.08V; identical pinout, package, and feature set | Targeted at +5V or +4.5V systems rather than +3.3V applications | Select when supervising higher-voltage rails; otherwise, MAX6703ASKA+T is optimal for 3.3V-centric designs |
| MAX6705ASKA+T | Single-supply supervision only (no RST_IN1/RST_IN2); includes PFO/PFI but lacks triple-voltage capability | Suitable for cost-sensitive single-rail applications where only VCC monitoring is required | Choose MAX6703ASKA+T when triple-rail supervision is mandatory; use MAX6705ASKA+T only if design uses one supply rail |
Compared with MAX6703MSKA+T and MAX6705ASKA+T, the MAX6703ASKA+T uniquely delivers 3.08V fixed-threshold triple-supply monitoring in open-drain configuration - making it the only option among the three that satisfies concurrent +3.3V, +2.5V, and +1.8V rail supervision with independent watchdog signaling.
Availability
MAX6703ASKA+T is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, critical µP power monitoring, networking equipment, and white goods requiring stable component supply across extended temperature ranges.
Supply support for MAX6703ASKA+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 demanding industrial, communications, and computing applications.
The MAX6701–MAX6708 family was engineered specifically for space-constrained, multivoltage microprocessor systems requiring integrated reset, watchdog, power-fail warning, and manual reset functions in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6703ASKA+T?
The MAX6703ASKA+T has a nominal VCC reset threshold of 3.08V, with guaranteed limits of 3.00V (min) and 3.15V (max) over -40°C to +85°C, and 2.97V to 3.17V over -40°C to +125°C. This threshold is factory-trimmed and applies specifically to the "T" suffix variant, matching +3.3V system rails with margin for tolerance and drift.
Does MAX6703ASKA+T support triple-voltage supervision, and how is it implemented?
Yes, MAX6703ASKA+T supports triple-voltage supervision: VCC is monitored at its fixed 3.08V threshold, while RST_IN1 and RST_IN2 accept externally divided voltages referenced to an internal 0.62V comparator. Each input can be configured to monitor secondary rails (e.g., 2.5V or 1.8V) using resistor dividers, and RESET asserts if any of the three inputs falls below its respective threshold.
What is the function of the WDO pin on MAX6703ASKA+T, and how does it differ from RESET?
The WDO pin on MAX6703ASKA+T is an independent active-low open-drain watchdog output that asserts when the watchdog timer expires (after 1.6s of no WDI edge) or when VCC/RST_IN1/RST_IN2 drop below threshold. Unlike RESET, WDO remains asserted until cleared by a WDI edge or MR low - enabling separate NMI-based fault handling without affecting the main reset state.
Can MAX6703ASKA+T operate reliably at low VCC levels, and what is its minimum functional voltage?
Yes, MAX6703ASKA+T guarantees valid RESET output down to VCC = 1V, with full functionality including reset assertion, watchdog timing, and PFI comparison operational across 1.2V to 5.5V. Below 1V, RESET becomes high-impedance, but the device maintains defined behavior throughout its specified operating range, critical for brownout resilience.
How does the PFI/PFO interface work on MAX6703ASKA+T, and what design flexibility does it offer?
The PFI pin on MAX6703ASKA+T is a high-impedance input tied to a 0.62V internal reference; connecting it to a resistor divider from a secondary supply enables precise power-fail detection at user-defined thresholds. PFO is an open-drain output that goes low when PFI < 0.62V, allowing direct connection to µP interrupts or cascaded reset circuits - supporting early-warning shutdown and multi-rail coordination.
MAX6703ASKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.93V, Adj, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6703ASKA+T FAQ
1.How can I place an order for MAX6703ASKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703ASKA+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 MAX6703ASKA+T reliable?
The price and inventory of MAX6703ASKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703ASKA+T is usually 5 days.
3.What payment methods are accepted for MAX6703ASKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703ASKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703ASKA+T?
MAX6703ASKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703ASKA+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 MAX6703ASKA+T?
For technical support, including MAX6703ASKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703ASKA+T requirements.
6.How does Aetrix verify that MAX6703ASKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6703ASKA+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 MAX6703ASKA+T meets industry standards.
7.What is the process for return or replacement of MAX6703ASKA+T?
All MAX6703ASKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703ASKA+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 MAX6703ASKA+T part is unused and in its original packaging.
Return procedure for MAX6703ASKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6703ASKA+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
