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Analog Devices Inc./Maxim Integrated MAX6708ZKA+T
- Part No.:
- MAX6708ZKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6708ZKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,169
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Product details
Overview
MAX6708ZKA+T from Maxim Integrated is a precision microprocessor supervisory IC in an 8-pin SOT23 package, designed for dual active-low/active-high reset generation in low-voltage systems. It monitors a single supply (2.25V–2.38V threshold), provides 140ms reset timeout, independent power-fail detection (0.62V PFI threshold), and guaranteed reset validity down to VCC = 1V. It is used in white goods and telecom equipment for reliable power-up/down and brownout protection.
For engineers reviewing the MAX6708ZKA+T datasheet, MAX6708ZKA+T pinout, MAX6708ZKA+T application, or MAX6708ZKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing, power-fail comparator behavior, and validated alternatives - all specific to the Z-suffix (2.32V nominal threshold), KA package, and +T lead-free variant.
Technical Context
The MAX6708ZKA+T implements a dual-output reset architecture: one active-low push-pull RESET and one active-high push-pull RESET, both asserted simultaneously during VCC undervoltage, manual reset, or power-fail events. Its internal 0.62V reference drives the PFI comparator, enabling external voltage monitoring via resistive dividers.
No watchdog timer is integrated - unlike MAX6704, MAX6708ZKA+T omits WDI/WDO functionality entirely. Reset assertion is triggered solely by VCC falling below the 2.24V–2.40V (−40°C to +125°C) threshold, MR pull-down, or PFI < 0.62V, with hysteresis of 6mV on PFI and ±30ppm/°C temperature coefficient on VTH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.24V min / 2.40V max over −40°C to +125°C - ensures reliable reset assertion across industrial temperature range for 2.3V-class supplies |
| Reset Timeout Period | 140ms typ / 300ms max - guarantees µP reset pulse width sufficient to complete boot initialization |
| Power-Fail Input Threshold | 0.602V min / 0.642V max - enables accurate early-warning detection of secondary supply collapse |
| Supply Current | 6µA min / 20µA max at VCC < 3.6V - ultra-low quiescent current preserves battery life in always-on systems |
| Operating Voltage Range | 1.2V min / 5.5V max - supports operation down to brownout recovery and up to legacy 5V rails |
| VCC to RESET Delay | 12µs max - ensures fast response to rapid supply transients without false triggering |
| Reset Output Drive | Dual push-pull: active-low RESET and active-high RESET - eliminates need for external inverters or pull-ups |
Pinout & Package
Package: 8-pin SOT23 (KA), surface-mount, RoHS-compliant lead-free (+T suffix), 2.9mm × 1.6mm footprint, 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces simultaneous assertion of both RESET outputs for ≥140ms |
| 2 VCC | Supply voltage and primary reset monitor input | Powers internal circuitry and serves as the main monitored rail; reset triggers when VCC falls below 2.24–2.40V |
| 3 GND | Ground reference | Common return path for all internal comparators, reset generator, and output drivers |
| 4 PFI | Power-fail voltage monitor input | High-impedance (±200nA leakage) node tied to 0.62V internal reference; accepts external divider for secondary supply monitoring |
| 5 PFO | Power-fail output | Active-low push-pull output asserted when PFI < 0.62V; can drive µP interrupt or trigger backup logic |
| 6 N.C. | No connection | Not internally bonded; must be left floating - no routing or termination required |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at VCC ≥ 4.25V; asserts low during all fault conditions |
| 8 RESET | Active-high reset output | Complementary push-pull output; high during normal operation, low only during reset - eliminates need for external inverter |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate external logic and reduce BOM count |
| 0.62V precision PFI comparator | Enables accurate monitoring of secondary supplies (e.g., 1.2V, 1.8V) using simple resistor dividers with minimal component count |
| 140ms guaranteed reset timeout | Ensures µP reset pulse meets minimum duration requirements for ARM Cortex-M, PIC, and other embedded processors |
| Operation down to VCC = 1.2V | Supports brownout recovery and low-power retention modes in battery-backed systems |
| Immunity to short VCC transients | Rejects sub-100ns supply glitches, preventing spurious resets in noisy industrial environments |
Applications
| White Goods Control | Telecom Power Management |
|---|---|
Use Scenario: Monitoring 2.3V I/O supply in washing machine main controller during AC line sags and motor startup surges. IC Role / Device Role / Timing Role: Dual-reset supervisor asserting both active-low and active-high signals to reset MCU and enable sequenced power-down of peripherals. Use Value: Prevents firmware corruption during 100ms brownouts by guaranteeing 140ms reset hold time and detecting PFI dips before main rail collapse. |
Use Scenario: Supervising 2.3V FPGA configuration voltage in optical line terminal (OLT) under variable load and thermal stress. IC Role / Device Role / Timing Role: Primary power-good monitor generating synchronized reset edges for FPGA and associated SerDes PHYs. Use Value: Eliminates need for discrete reset IC + inverter pair; reduces PCB area by 35% and improves timing margin with matched rise/fall characteristics. |
| Industrial Networking Switch | Critical µP Power Monitoring |
Use Scenario: Ensuring clean boot of ARM-based switch controller after PoE injector power cycling or cable disconnect/reconnect events. IC Role / Device Role / Timing Role: Single-supply supervisor with PFI monitoring of auxiliary 3.3V management rail to preemptively signal impending failure. Use Value: Enables graceful shutdown of packet buffers and MAC layer via PFO interrupt, reducing packet loss during controlled power loss. |
Use Scenario: Protecting medical diagnostic instrument's 2.3V analog front-end supply against undervoltage-induced ADC offset drift. IC Role / Device Role / Timing Role: Precision threshold detector with 60ppm/°C drift control, ensuring reset remains valid across −40°C to +125°C ambient. Use Value: Guarantees system-level safety compliance (IEC 62304) by enforcing mandatory reset during supply deviation >3% from nominal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6704ZKA+T | Includes 1.6s watchdog timer with reset-based timeout; same dual-reset outputs and PFI/PFO | Required where µP activity monitoring is mandated (e.g., safety-critical boot verification) | Select MAX6704ZKA+T if watchdog supervision is needed; MAX6708ZKA+T is preferred when watchdog adds unnecessary complexity or cost |
| TPS3808G12QDBVRQ1 | Single active-low open-drain reset; 1.2V threshold; automotive AEC-Q100 qualified; no PFO/PFI | Suitable for automotive body control modules but lacks power-fail warning capability | Choose TPS3808G12QDBVRQ1 only for automotive-grade 1.2V systems without secondary supply monitoring needs |
Compared with MAX6704ZKA+T, MAX6708ZKA+T removes watchdog logic to reduce quiescent current (6µA vs. 9µA) and simplify design; compared with TPS3808G12QDBVRQ1, it offers dual-reset polarity and dedicated power-fail signaling - critical for industrial and telecom applications requiring coordinated reset and early warning.
Availability
MAX6708ZKA+T is available at Aetrix Electronics and suitable for white goods control, telecom power management, industrial networking switches, and critical µP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX6708ZKA+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 MAX6701–MAX6708 family targets compact, low-power microprocessor supervision in space-constrained systems - delivering multi-function monitoring (reset, power-fail, manual reset) in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage range for MAX6708ZKA+T over temperature?
The MAX6708ZKA+T has a guaranteed VCC reset threshold of 2.24V (min) to 2.40V (max) across −40°C to +125°C. This corresponds to the Z-suffix variant (2.32V nominal at +25°C), with ±30ppm/°C temperature coefficient. The MAX6708ZKA+T datasheet specifies these limits in the Electrical Characteristics table under "VTH" for Z versions, confirming full industrial-range validity without derating.
Does MAX6708ZKA+T include a watchdog timer function?
No, MAX6708ZKA+T does not include a watchdog timer. It is functionally identical to MAX6704 but without the watchdog input (WDI) and watchdog output (WDO) pins. The MAX6708ZKA+T pinout omits WDI (pin 6) and uses it as N.C., and no watchdog timing or clearing logic is present - confirmed in the Functional Diagram (Figure 2) and "Detailed Description" section of the MAX6701–MAX6708 datasheet.
What are the key differences between MAX6708ZKA+T and MAX6704ZKA+T?
The MAX6708ZKA+T and MAX6704ZKA+T share identical reset thresholds, dual complementary outputs, PFI/PFO, and package. The sole difference is that MAX6704ZKA+T includes a 1.6s watchdog timer with reset-based timeout (asserting RESET on overflow), while MAX6708ZKA+T completely omits watchdog circuitry - resulting in lower supply current (6µA vs. 9µA) and simplified layout with N.C. on pin 6.
Can MAX6708ZKA+T monitor voltages other than VCC?
Yes, MAX6708ZKA+T can monitor secondary voltages via its PFI pin. By connecting an external resistor divider to PFI, any supply (e.g., 1.2V, 1.8V, 3.3V) can be scaled to trip the internal 0.62V comparator. The MAX6708ZKA+T datasheet provides the divider formula (R1 = R2 × (VEXT_TH/0.62 − 1)) and confirms PFI leakage ≤ ±200nA, enabling high-impedance, low-error monitoring without loading the source rail.
Is the MAX6708ZKA+T pinout compatible with other MAX670x devices in SOT23-8?
MAX6708ZKA+T uses the same 8-pin SOT23 (KA) footprint as other MAX670x variants, but pin functions differ. Specifically, pin 6 is N.C. in MAX6708ZKA+T (vs. WDI in MAX6701–MAX6707), and pins 7–8 provide dual RESET outputs (vs. single RESET + WDO in many variants). Layout reuse requires verification of signal mapping - MAX6708ZKA+T is not pin-compatible with MAX6705 or MAX6704 without netlist updates.
MAX6708ZKA+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:
- 2.32V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/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
MAX6708ZKA+T FAQ
1.How can I place an order for MAX6708ZKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6708ZKA+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 MAX6708ZKA+T reliable?
The price and inventory of MAX6708ZKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6708ZKA+T is usually 5 days.
3.What payment methods are accepted for MAX6708ZKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6708ZKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6708ZKA+T?
MAX6708ZKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6708ZKA+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 MAX6708ZKA+T?
For technical support, including MAX6708ZKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6708ZKA+T requirements.
6.How does Aetrix verify that MAX6708ZKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6708ZKA+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 MAX6708ZKA+T meets industry standards.
7.What is the process for return or replacement of MAX6708ZKA+T?
All MAX6708ZKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6708ZKA+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 MAX6708ZKA+T part is unused and in its original packaging.
Return procedure for MAX6708ZKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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