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Analog Devices Inc./Maxim Integrated MAX6735KAZID3+T
- Part No.:
- MAX6735KAZID3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KAZID3+T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
MAX6735KAZID3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+2.625V nominal), VCC2 (+1.575V nominal), and an adjustable RSTIN input (626mV threshold), featuring 280ms minimum reset timeout, push-pull RST/WDO outputs, and manual reset input - used in multivoltage embedded systems requiring reliable power-on reset and lockup recovery.
For engineers reviewing the MAX6735KAZID3+T datasheet, MAX6735KAZID3+T pinout, MAX6735KAZID3+T application, or MAX6735KAZID3+T equivalent, key selection considerations include its dual-supply monitoring capability, factory-set thresholds for VCC1/VCC2, adjustable third-voltage detection via RSTIN, 1.12s normal watchdog timeout, and SOT23-8 push-pull output compatibility with bidirectional μP reset pins.
Technical Context
The MAX6735KAZID3+T implements a triple-threshold supervisory architecture: two factory-trimmed comparators for VCC1 and VCC2 (suffix "ZI" = 2.313V / 1.388V), plus a high-impedance adjustable comparator on RSTIN referenced to 626mV. It guarantees valid reset assertion down to VCC1 or VCC2 = +0.8V and features hysteresis of 0.5% on reset thresholds.
Its watchdog timer operates in dual-mode: 35s (min) startup delay after reset, then transitions to 1.12s (min) normal timeout upon first WDI edge detection; WDO and RST are independently asserted push-pull outputs, each with guaranteed VOL ≤ 0.3V at ISINK = 1.2mA (VCC1 ≥ +2.7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.313V (nominal, falling); enables reliable reset assertion for +2.5V core rails with ±1.5% tolerance over -40°C to +85°C |
| VCC2 Threshold | 1.388V (nominal, falling); supports monitoring of +1.5V or +1.35V auxiliary supplies with 20ppm/°C tempco |
| RSTIN Threshold | 626mV (typical); allows external resistive divider to monitor voltages down to +0.63V, e.g., +1.2V via 1.91:1 ratio |
| Reset Timeout | 140ms (min) / 280ms (max); D3 suffix ensures sufficient hold time for slow-ramping FPGAs or DDR memory initialization |
| Watchdog Timeout | 1.12s (min) normal mode; provides rapid fault detection during runtime while avoiding spurious timeouts during ISR execution |
| Supply Current | 15µA (typ) at +3.6V; enables >10-year battery life in always-on supervisory applications with no duty cycling required |
| Operating Temp | -40°C to +85°C; fully specified across industrial temperature range without derating or conditional limits |
Pinout & Package
MAX6735KAZID3+T is housed in an 8-pin SOT23 package (package code K8SN+1), measuring 2.9mm × 1.6mm × 1.1mm, with exposed pad not connected internally and JEDEC-standard footprint (land pattern 90-0176). Thermal resistance θJA = 180°C/W enables operation at full rating up to +70°C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives low to reset μP without external pullup; asserts when VCC1/VCC2/RSTIN drop below threshold or MR is pulled low |
| 2 - GND | Power ground reference | Common return path for all internal comparators, watchdog logic, and output drivers; must be low-impedance |
| 3 - WDO | Active-low push-pull watchdog output | Asserts independently of RST when WDI lacks transition for >1.12s; deasserts immediately upon valid WDI edge |
| 4 - VCC1 | Primary supply voltage input | Powers device and serves as reference for VCC1 monitor and RSTIN comparator; must be ≥0.8V for valid reset operation |
| 5 - RSTIN | Adjustable undervoltage comparator input | High-impedance (±25nA) node referenced to 626mV; accepts divided-down voltages for third-rail monitoring |
| 6 - WDI | Watchdog input | Edge-sensitive input that clears watchdog timer on rising or falling transition; unconnected = watchdog remains active |
| 7 - MR | Active-low manual reset input | Internal 50kΩ pullup to VCC1; drives RST low for reset timeout period after release; immune to <100ns glitches |
| 8 - VCC2 | Secondary supply voltage input | Input to secondary reset comparator; powers internal circuitry only if VCC2 > VCC1; supports down to +0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1, VCC2, and RSTIN - eliminates need for discrete comparators or multiple supervisors in multirail systems |
| Independent watchdog output | WDO asserts separately from RST, enabling system-level watchdog-triggered diagnostics or safe shutdown without resetting CPU |
| Dual-mode watchdog timer | 35s startup delay prevents false timeout during boot; automatic switch to 1.12s runtime mode ensures fast lockup detection |
| Push-pull RST/WDO outputs | Eliminates external pullup resistors and reduces BOM count; compatible with μPs requiring driven-high reset release |
| Immunity to VCC transients | Rejects <100µs falling glitches at 100mV overdrive - avoids spurious resets in noisy power environments |
Applications
| Industrial PLC Controllers | Network Router Power Management |
|---|---|
Use Scenario: Monitoring +3.3V I/O, +1.8V PHY, and +1.2V core rails in DIN-rail mounted controllers operating in wide-temperature industrial cabinets. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across FPGA, ARM Cortex-M7, and Ethernet PHY upon any rail dropout. Use Value: Prevents partial initialization failures by holding reset until all three rails stabilize above their precise thresholds (2.313V/1.388V/0.626V). |
Use Scenario: Ensuring clean boot and runtime recovery in multi-core SoC-based routers with separate +5V PoE interface, +3.3V management MCU, and +1.0V DDR termination. IC Role / Device Role / Timing Role: Supervises primary +3.3V rail (VCC1), secondary +1.388V rail (VCC2), and adjustable +1.0V termination (RSTIN via divider), with WDO feeding watchdog interrupt to Linux kernel. Use Value: Enables autonomous recovery from software hangs without requiring host CPU intervention - critical for carrier-grade uptime SLAs. |
| Medical Infusion Pump Logic Board | Automotive ADAS Camera Module |
Use Scenario: Validating stable +3.3V microcontroller supply, +2.5V sensor ADC reference, and +1.2V image processor core in battery-powered infusion pumps with strict safety certification requirements. IC Role / Device Role / Timing Role: Provides fail-safe reset generation and watchdog supervision for ISO 13485-compliant firmware, with MR tied to emergency stop button. Use Value: Guarantees reset validity down to VCC = +0.8V - essential for brownout detection during battery discharge curves. |
Use Scenario: Monitoring +5V camera lens actuator, +3.3V image signal processor, and +1.1V MIPI CSI-2 PHY in automotive-grade camera modules operating from 12V vehicle battery. IC Role / Device Role / Timing Role: Acts as primary power integrity guardian, asserting RST on any rail sag and triggering WDO-driven error logging before thermal shutdown. Use Value: Meets AEC-Q100 stress test requirements with guaranteed -40°C to +85°C operation and 20ppm/°C threshold stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KAZID3+T | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pullups | Suitable where level-shifting or wired-OR reset buses are needed; incompatible with μPs requiring driven-high reset release | Select MAX6734KAZID3+T only if system design mandates open-drain topology or shares reset bus with other devices |
| TPS3808G33DBVR | Dual-voltage supervisor (no RSTIN), fixed 3.08V/1.23V thresholds, 200ms timeout, push-pull RST only | Lacks third-rail monitoring and independent WDO; requires external circuitry for adjustable voltage supervision | Choose TPS3808G33DBVR only for simpler dual-rail systems where RSTIN functionality is unnecessary and cost is prioritized |
Compared with MAX6734KAZID3+T and TPS3808G33DBVR, MAX6735KAZID3+T uniquely delivers triple-rail supervision with independent push-pull watchdog output in a single SOT23-8 package - eliminating board space, BOM count, and timing coordination overhead in complex multivoltage designs.
Availability
MAX6735KAZID3+T is available at Aetrix Electronics and suitable for industrial control systems, network infrastructure equipment, and medical electronics requiring stable component supply with full lifecycle support and RoHS-compliant packaging.
Supply support for MAX6735KAZID3+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, with expertise in power management and reliability-critical supervision.
MAX6735KAZID3+T belongs to the MAX6730–MAX6735 family of microprocessor supervisors engineered specifically for multivoltage embedded systems needing coordinated reset, robust watchdog coverage, and minimal external components.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735KAZID3+T?
The MAX6735KAZID3+T uses suffix "ZI", specifying a VCC1 reset threshold of 2.313V (nominal, falling) and VCC2 threshold of 1.388V (nominal, falling), both guaranteed over -40°C to +85°C with 20ppm/°C tempco and 0.5% hysteresis. These values are factory-trimmed and do not require external calibration.
Does the MAX6735KAZID3+T support monitoring a third voltage higher than 0.63V?
Yes - the MAX6735KAZID3+T supports monitoring voltages above 0.63V using the RSTIN pin with an external resistive divider. For example, to monitor +1.2V, connect R1 = 910kΩ and R2 = 1MΩ between VCC and GND, with RSTIN tied to the node between them, yielding ~626mV at RSTIN when +1.2V is applied.
What is the watchdog timeout behavior of the MAX6735KAZID3+T during system boot?
The MAX6735KAZID3+T implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enforces a 35s (minimum) initial timeout period to allow full system initialization, then automatically switches to 1.12s (minimum) normal timeout upon detecting the first valid edge on WDI - ensuring both safe boot and responsive runtime fault detection.
Can the MAX6735KAZID3+T operate with VCC1 and VCC2 supplied from different sources?
Yes - the MAX6735KAZID3+T is designed for independent VCC1 and VCC2 supplies. VCC1 powers the device and serves as the reference for its own monitor and RSTIN comparator; VCC2 powers only its secondary comparator. Both inputs accept 0.8V to 5.5V and may be derived from separate regulators without synchronization.
Is the MAX6735KAZID3+T pin-compatible with other members of the MAX6730–MAX6735 family?
No - the MAX6735KAZID3+T uses an 8-pin SOT23 package and is not pin-compatible with 6-pin variants (e.g., MAX6730–MAX6733). However, it shares identical pin functions and layout with MAX6734KAZID3+T (same package, same pinout), differing only in RST/WDO output type (push-pull vs. open-drain).
MAX6735KAZID3+T 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:
- 3
- Voltage - Threshold:
- 1.388V, 2.313V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735KAZID3+T FAQ
1.How can I place an order for MAX6735KAZID3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KAZID3+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 MAX6735KAZID3+T reliable?
The price and inventory of MAX6735KAZID3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KAZID3+T is usually 5 days.
3.What payment methods are accepted for MAX6735KAZID3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KAZID3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KAZID3+T?
MAX6735KAZID3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KAZID3+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 MAX6735KAZID3+T?
For technical support, including MAX6735KAZID3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KAZID3+T requirements.
6.How does Aetrix verify that MAX6735KAZID3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735KAZID3+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 MAX6735KAZID3+T meets industry standards.
7.What is the process for return or replacement of MAX6735KAZID3+T?
All MAX6735KAZID3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KAZID3+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 MAX6735KAZID3+T part is unused and in its original packaging.
Return procedure for MAX6735KAZID3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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