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Analog Devices Inc. ADM13305-33ARZ
- Part No.:
- ADM13305-33ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM13305-33ARZ.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:289
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Product details
Overview
ADM13305-33ARZ from Analog Devices is a dual-voltage supervisor IC designed to monitor 5 V and 3.3 V power rails in microprocessor-based systems, providing both active-high and active-low reset outputs with 140 ms minimum timeout and 1.6 sec typical watchdog timer. It operates from 2.7 V to 5.5 V supply, draws ≤40 μA, and functions across −40°C to +85°C.
For engineers reviewing the ADM13305-33ARZ datasheet, ADM13305-33ARZ pinout, ADM13305-33ARZ application, or ADM13305-33ARZ equivalent, key selection considerations include its fixed 4.55 V / 2.93 V undervoltage thresholds, push-pull reset outputs, manual reset (MR) and watchdog input (WDI) interfaces, and narrow-body SOIC-8 package compatibility for space-constrained embedded designs.
Technical Context
The ADM13305-33ARZ integrates two independent voltage sense comparators with factory-trimmed thresholds of 4.55 V (SENSE1) and 2.93 V (SENSE2), each with ≥15 mV hysteresis. Its internal logic asserts RESET/RESET when either input falls below its falling threshold (VIT−), maintaining reset for ≥140 ms after recovery.
A dedicated on-chip oscillator drives a 1.6 sec watchdog timer cleared by any WDI edge transition; failure to toggle WDI within timeout triggers reset. Manual reset via MR pin provides synchronous deassertion after timeout, and both reset outputs remain valid down to VDD = 1.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 5.5 V - supports wide-input industrial and portable systems without external regulation. |
| SENSE1 Threshold (VIT−) | 4.46 V to 4.67 V - monitors 5 V rail with guaranteed margin against nominal 5 V ±5% tolerance. |
| SENSE2 Threshold (VIT−) | 2.86 V to 3.02 V - supervises 3.3 V rail with headroom above 3.3 V × 0.85 = 2.805 V minimum. |
| Reset Timeout | 140 ms minimum - ensures stable CPU initialization before release in DSP/microcontroller power-up sequences. |
| Watchdog Timeout | 1.1 sec to 2.3 sec (typ 1.6 sec) - balances fault detection responsiveness with noise immunity in real-time firmware. |
| Supply Current | ≤40 μA - enables always-on supervision in battery-backed or low-power IoT nodes. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environments without derating. |
Pinout & Package
ADM13305-33ARZ is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, R-8), 4.80 mm × 3.80 mm footprint, 1.27 mm lead pitch, with θJA = 206°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSE1 | Voltage sense input 1 | Monitors 5 V rail; asserts reset if voltage drops below 4.46–4.67 V falling threshold. |
| 2 SENSE2 | Voltage sense input 2 | Monitors 3.3 V rail; asserts reset if voltage drops below 2.86–3.02 V falling threshold. |
| 3 WDI | Watchdog timer input | Edge-sensitive input; must be toggled within 1.6 sec to prevent system reset. |
| 4 GND | Analog/digital ground reference | Common return path for all internal circuits; requires low-impedance PCB connection. |
| 5 RESET | Active-low push-pull reset output | Drives low during reset condition; sinks up to 2 mA at 3.3 V with VOL ≤ 0.4 V. |
| 6 RESET | Active-high push-pull reset output | Drives high during reset condition; sources up to 2 mA at 3.3 V with VOH ≥ 2.9 V. |
| 7 MR | Manual reset input | Active-low input; pulling low forces reset assertion for full timeout period regardless of SENSE states. |
| 8 VDD | Positive supply input | Power source for internal circuitry; reset outputs remain valid down to 1.1 V supply. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold supervision | Simultaneously monitors 5 V and 3.3 V rails with factory-trimmed 4.55 V / 2.93 V thresholds-no external resistors required. |
| Push-pull RESET and RESET outputs | Eliminates need for external pull-up/pull-down resistors; compatible with both active-high and active-low reset architectures. |
| Watchdog timer with edge-triggered WDI | Resets system on firmware hang; WDI accepts any logic transition (rising or falling), simplifying MCU GPIO usage. |
| Valid reset operation down to VDD = 1.1 V | Ensures reliable power-on reset assertion even during brownout conditions before full VDD stabilization. |
| 140 ms minimum reset timeout | Guarantees sufficient hold time for CPU PLL lock, memory initialization, and peripheral configuration before release. |
Applications
| Industrial PLC Controller | Notebook Power Management |
|---|---|
Use Scenario: Monitoring 5 V I/O bus and 3.3 V logic rail in programmable logic controller backplane. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring synchronized reset of FPGA, ARM Cortex-M7, and isolated CAN transceivers during cold start or brownout. Use Value: Prevents partial initialization and metastability by holding both processors and peripherals in reset until both rails exceed 4.46 V and 2.86 V respectively for ≥140 ms. | Use Scenario: Supervising main 5 V DC-DC converter and 3.3 V SoC core rail in ultrabook motherboard. IC Role / Device Role / Timing Role: Provides primary power-on reset signal and watchdog safety net for Intel Core i5 CPU and integrated GPU. Use Value: Enables deterministic boot sequence and recovers from firmware lockup via WDI toggling-critical for UEFI firmware execution integrity. |
| Wireless Base Station Radio Card | Medical Infusion Pump Controller |
Use Scenario: Validating 5 V RF front-end bias supply and 3.3 V digital baseband processor supply in LTE small cell radio module. IC Role / Device Role / Timing Role: Dual-supply monitor with manual reset override for field service and watchdog protection against DSP algorithm faults. Use Value: Guarantees RF subsystem remains disabled until both supplies stabilize, preventing spurious transmission during power ramp. | Use Scenario: Ensuring safe startup and runtime supervision of 5 V motor driver and 3.3 V ARM-based safety-critical control MCU in Class II medical device. IC Role / Device Role / Timing Role: Fault-tolerant reset generator with MR pin for clinician-initiated reboot and watchdog for infusion algorithm monitoring. Use Value: Meets IEC 62304 SW safety requirements by enforcing hardware-enforced reset on supply fault or software hang-no reliance on software-only watchdog. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816EUS+T | Single 3.3 V supervisor with 140 ms timeout; no dual-rail or watchdog capability. | Lacks SENSE1 monitoring and WDI interface-requires separate ICs for 5 V rail and watchdog. | Select only if supervising one rail and adding discrete watchdog logic is acceptable. |
| TPS3808G33DBVR | Single 3.3 V supervisor with adjustable delay; no second sense input or watchdog timer. | Cannot monitor 5 V rail natively; no WDI pin-requires MCU GPIO polling or external timer. | Use only for cost-sensitive single-rail applications where dual supervision is handled elsewhere. |
Compared with MAX6816EUS+T and TPS3808G33DBVR, the ADM13305-33ARZ uniquely integrates dual fixed-threshold supervision, push-pull dual-reset outputs, and edge-triggered watchdog in one SOIC-8 package-reducing BOM count, PCB area, and firmware complexity in multi-rail embedded systems.
Availability
ADM13305-33ARZ is available at Aetrix Electronics and suitable for industrial PLC controllers, notebook power management, wireless base station radio cards, and medical infusion pump controllers requiring stable component supply and long-term lifecycle support.
Supply support for ADM13305-33ARZ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM13305 family delivers dual-rail supervision with integrated watchdog for microprocessor-based systems, targeting applications where simultaneous monitoring of multiple power domains and fail-safe recovery are essential.
FAQ
What are the exact voltage thresholds monitored by ADM13305-33ARZ?
The ADM13305-33ARZ monitors SENSE1 at a falling threshold of 4.46 V to 4.67 V (for 5 V rail) and SENSE2 at 2.86 V to 3.02 V (for 3.3 V rail), with ≥15 mV hysteresis per input. These are factory-trimmed values specified over −40°C to +85°C and require no external components-confirmed in Table 1 of the Rev. 0 datasheet.
Does ADM13305-33ARZ support watchdog functionality, and how is it configured?
Yes, ADM13305-33ARZ includes an on-chip watchdog timer with 1.1 sec to 2.3 sec timeout (typical 1.6 sec). It is enabled by default and cleared on any rising or falling edge at the WDI pin. Leaving WDI floating disables the watchdog-no external components or configuration registers are needed.
Can ADM13305-33ARZ operate with supply voltages below 3.3 V?
Yes, ADM13305-33ARZ operates from 2.7 V to 5.5 V and guarantees RESET/RESET output validity down to VDD = 1.1 V. Its internal circuitry remains functional during brownout, allowing robust power-on reset assertion even when main supply ramps slowly.
What is the reset timeout duration of ADM13305-33ARZ, and is it adjustable?
The ADM13305-33ARZ has a minimum reset timeout of 140 ms, typ 200 ms, and max 280 ms-determined by internal RC timing and not user-adjustable. This fixed delay ensures sufficient hold time for CPU and memory initialization without external timing components.
How does the manual reset (MR) pin function on ADM13305-33ARZ?
The MR pin is an active-low input that forces RESET/RESET assertion for the full 140 ms timeout period when pulled low, regardless of SENSE1/SENSE2 states. Upon MR release, reset remains active for the full timeout before deassertion-enabling hardware-initiated system reboot via push-button switch.
ADM13305-33ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 4.55V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM13305-33ARZ FAQ
1.How can I place an order for ADM13305-33ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM13305-33ARZ 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 ADM13305-33ARZ reliable?
The price and inventory of ADM13305-33ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM13305-33ARZ is usually 5 days.
3.What payment methods are accepted for ADM13305-33ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM13305-33ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM13305-33ARZ?
ADM13305-33ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM13305-33ARZ 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 ADM13305-33ARZ?
For technical support, including ADM13305-33ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM13305-33ARZ requirements.
6.How does Aetrix verify that ADM13305-33ARZ is sourced from the original manufacturer or authorized distributors?
All ADM13305-33ARZ 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 ADM13305-33ARZ meets industry standards.
7.What is the process for return or replacement of ADM13305-33ARZ?
All ADM13305-33ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM13305-33ARZ, 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 ADM13305-33ARZ part is unused and in its original packaging.
Return procedure for ADM13305-33ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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