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Analog Devices Inc./Maxim Integrated MAX6739XKZD3
- Part No.:
- MAX6739XKZD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX6739XKZD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:586
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Product details
Overview
The MAX6739XKZD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with one factory-trimmed reset threshold (VCC1) and one adjustable reset input (RSTIN), push-pull active-low RESET output, manual reset input (MR), and SC70-5 package. It monitors VCC1 at 2.925V ±2.5% and RSTIN down to 0.488V, asserts reset within 35µs, maintains 150ms minimum timeout, and draws only 6µA supply current - ideal for battery-powered portable systems requiring reliable dual-rail power monitoring.
For engineers reviewing the MAX6739XKZD3 datasheet, MAX6739XKZD3 pinout, MAX6739XKZD3 application, or MAX6739XKZD3 equivalent, key selection criteria include its fixed/adjustable dual-threshold architecture, push-pull RESET drive capability, MR timing compatibility (150ms timeout), SC70-5 footprint constraints, and operation across -40°C to +85°C industrial temperature range.
Technical Context
The MAX6739XKZD3 implements two independent voltage monitoring paths: VCC1 (primary I/O rail) with factory-set 2.925V threshold and RSTIN (secondary/auxiliary rail) referenced to an internal 0.488V comparator. Reset assertion occurs when either falls below its threshold, and deassertion requires both to remain above thresholds for ≥150ms (D3 suffix).
It features a dedicated active-low MR input with internal 1.5kΩ pullup to VCC1, push-pull RESET output referenced to VCC1 (VOH ≥ 0.8×VCC1, VOL ≤ 0.4V), and guaranteed valid operation down to VCC1 = 1.0V. No POK or power-fail functionality is integrated - distinguishing it from MAX6741/MAX6742 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.925V ±2.5% - factory-trimmed for stable I/O supply monitoring without external resistors |
| RSTIN Threshold | 0.488V (typ) - enables precise monitoring of auxiliary rails (e.g., 1.2V, 1.8V) via external resistor divider |
| Reset Timeout | 150ms min - ensures µP initialization completes before release; D3 suffix confirms this timing option |
| Supply Current | 6µA max - supports multi-year battery life in portable equipment and low-power IoT nodes |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive cabin-ambient applications |
| Package | SC70-5 - 1.6mm × 1.6mm footprint, compatible with high-density PCB layouts |
| RESET Output | Push-pull active-low - eliminates need for external pullup; drives directly into µP reset pin |
Pinout & Package
MAX6739XKZD3 uses the 5-pin SC70-5 package: compact, surface-mount, lead-free compatible, with 0.65mm pitch and thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; VOH ≥ 0.8×VCC1, VOL ≤ 0.4V at 500µA sink/source |
| 2 - GND | Analog/digital ground reference | Common return for all internal comparators, timers, and output stage; must be low-impedance |
| 3 - MR | Manual reset input (active-low) | Pulled up internally to VCC1 via 1.5kΩ; 1µs minimum pulse width required to trigger reset |
| 4 - RSTIN | Adjustable reset threshold input | Monitors auxiliary voltage via resistor divider; 10nA max input current enables high-R networks |
| 5 - VCC1 | Primary supply input & reference | Power source for internal circuitry and RESET output stage; also defines MR pullup and RSTIN reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual-threshold supervision | Combines fixed VCC1 (2.925V) and adjustable RSTIN (0.488V ref) - supports mixed-voltage SoC systems without extra components |
| Low quiescent current | 6µA max ICC1 - extends battery runtime in handheld medical devices and remote sensors |
| Push-pull RESET output | Eliminates external pullup resistor and associated board space; simplifies layout and reduces BOM count |
| MR input with internal pullup | 1.5kΩ internal VCC1-referenced pullup - enables direct connection to momentary switch without external biasing |
| Transient-immune design | Immune to VCC glitches <35µs at 100mV overdrive - prevents spurious resets during switching noise |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meter with dual-rail MCU (3.3V I/O, 1.8V core) and analog front-end. IC Role / Device Role / Timing Role: Supervises 3.3V I/O rail (VCC1 = 2.925V threshold) and 1.8V analog supply (RSTIN = 0.488V ref + divider), asserting RESET until both stabilize for ≥150ms. Use Value: Prevents firmware execution on marginal supplies; 6µA current extends single-CR2032 battery life beyond 2 years. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V-to-5V/3.3V DC-DC converters powering FPGA and communication ICs. IC Role / Device Role / Timing Role: Monitors primary 5V rail (VCC1 = 2.925V threshold) and secondary 3.3V rail (RSTIN divider), coordinating safe startup sequence before enabling field I/O drivers. Use Value: Ensures deterministic boot state across temperature (-40°C to +85°C); push-pull RESET avoids pullup conflicts in noisy industrial environments. |
| Wearables with Low-Voltage RF | Smart Meter Communication Subsystems |
Use Scenario: Bluetooth LE smartwatch using 1.2V RF transceiver and 3.0V application processor. IC Role / Device Role / Timing Role: Tracks 3.0V processor rail (VCC1 = 2.925V) and 1.2V RF supply (RSTIN configured for 1.2V via 2.45:1 divider), holding RESET until both meet timeout. Use Value: Guarantees RF subsystem initializes only after stable power - eliminating BLE connection dropouts during cold start. | Use Scenario: ANSI C12.19-compliant smart meter with separate 3.3V metrology ASIC and 1.8V PLC modem. IC Role / Device Role / Timing Role: Supervises 3.3V metrology rail (VCC1 = 2.925V) and 1.8V modem rail (RSTIN = 0.488V ref + divider), asserting RESET if either sags during line transient events. Use Value: Maintains data integrity during grid disturbances; MR input allows field technician-initiated recalibration without power cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6737XKZD3 | Dual fixed thresholds (VCC1 = 2.925V, VCC2 = 2.188V); open-drain RESET; no RSTIN | Lacks adjustable monitoring - suitable only when both rails have known, stable voltages | Choose when second rail is fixed (e.g., 2.2V) and system already includes pullup resistor |
| TPS3808G33DBVR | Single fixed 3.3V threshold; open-drain RESET; 350ms timeout; 1.1µA IQ | No dual-rail support - requires two ICs for same function; lower IQ but higher footprint cost | Select only for single-supply systems where ultra-low current outweighs dual-monitoring need |
Compared with MAX6737XKZD3, the MAX6739XKZD3 provides flexible RSTIN-based monitoring instead of fixed VCC2, enabling adaptation to variable auxiliary rails. Versus TPS3808G33DBVR, it delivers true dual-threshold supervision in one SC70-5 device - reducing component count, board area, and qualification effort.
Availability
MAX6739XKZD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wearables with low-voltage RF, and smart meter communication subsystems requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6739XKZD3 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, medical, and communications applications.
The MAX6736–MAX6745 product line delivers ultra-low-power dual- and triple-voltage supervisors optimized for portable, battery-operated, and space-constrained systems requiring reliable power-on reset and supply monitoring.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6739XKZD3?
The MAX6739XKZD3 has a factory-trimmed VCC1 reset threshold of 2.925V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed by the "Z" suffix in the part number per Table 2 of the datasheet and applies specifically to the VCC1 input pin (Pin 5), not RSTIN or other rails.
Does the MAX6739XKZD3 support power-fail detection or POK output?
No, the MAX6739XKZD3 does not include power-fail input/output (PFI/PFO) or power-OK (POK1) functionality. Its feature set is limited to dual-voltage supervision (one fixed, one adjustable), manual reset input, and push-pull RESET output - as defined in the Selector Guide and Pin Description table. For PFI/PFO, consider MAX6742XKZD3 or MAX6745XKZD3 instead.
What is the function of the RSTIN pin on the MAX6739XKZD3?
The RSTIN pin on the MAX6739XKZD3 serves as an adjustable reset threshold input referenced to an internal 0.488V comparator. By connecting an external resistor divider between VCC1 and GND, designers can monitor auxiliary supply voltages (e.g., 1.2V, 1.8V) with high accuracy and minimal current draw (<10nA). The MAX6739XKZD3 asserts RESET if RSTIN falls below 0.488V.
Is the RESET output of the MAX6739XKZD3 push-pull or open-drain?
The RESET output of the MAX6739XKZD3 is push-pull active-low, as confirmed by the Selector Guide (row MAX6739 shows "X" under PUSH-PULL RESET and "-" under OPEN-DRAIN RESET) and Pin Description (Pin 1 function states "Reset Output, Push-Pull"). This eliminates the need for an external pullup resistor and allows direct interfacing with most µP reset inputs.
What is the minimum pulse width required on the MR pin to trigger reset on the MAX6739XKZD3?
The MR pin of the MAX6739XKZD3 requires a minimum low pulse width of 1µs to reliably assert the RESET output, as specified in the Electrical Characteristics table under "MR Minimum Input Pulse Width (tMPW)". This short requirement enables compatibility with fast digital logic and mechanical pushbutton switches without debounce circuitry.
MAX6739XKZD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX6739XKZD3 FAQ
1.How can I place an order for MAX6739XKZD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6739XKZD3 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 MAX6739XKZD3 reliable?
The price and inventory of MAX6739XKZD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6739XKZD3 is usually 5 days.
3.What payment methods are accepted for MAX6739XKZD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6739XKZD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6739XKZD3?
MAX6739XKZD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6739XKZD3 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 MAX6739XKZD3?
For technical support, including MAX6739XKZD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6739XKZD3 requirements.
6.How does Aetrix verify that MAX6739XKZD3 is sourced from the original manufacturer or authorized distributors?
All MAX6739XKZD3 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 MAX6739XKZD3 meets industry standards.
7.What is the process for return or replacement of MAX6739XKZD3?
All MAX6739XKZD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6739XKZD3, 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 MAX6739XKZD3 part is unused and in its original packaging.
Return procedure for MAX6739XKZD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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