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Analog Devices Inc. ADM13305-25ARZ
- Part No.:
- ADM13305-25ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM13305-25ARZ.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,722
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Product details
Overview
ADM13305-25ARZ from Analog Devices is a dual-voltage supervisor IC designed to monitor 3.3 V and 2.5 V power rails in microprocessor and DSP systems, providing both active-high and active-low push-pull reset outputs with 140 ms minimum timeout, 1.6 sec watchdog timer, and operation from 2.7 V to 5.5 V supply. It supports industrial temperature range (−40°C to +85°C) and is used in notebook computers and wireless baseband subsystems.
For engineers reviewing the ADM13305-25ARZ datasheet, ADM13305-25ARZ pinout, ADM13305-25ARZ application, or ADM13305-25ARZ equivalent, key selection considerations include its fixed 2.93 V / 2.25 V dual-threshold configuration, RESET assertion down to VDD ≥ 1.1 V, low 40 μA supply current, and SOIC_N-8 package compatibility with space-constrained embedded designs.
Technical Context
The ADM13305-25ARZ implements two independent undervoltage detection channels with pretrimmed thresholds of 2.93 V (SENSE1) and 2.25 V (SENSE2), each featuring 30 mV hysteresis and glitch immunity. Its internal logic ensures RESET remains asserted until both monitored supplies exceed their rising thresholds and the 140–280 ms timeout elapses.
It integrates a watchdog timer cleared by any WDI edge transition, with 1.1–2.3 sec timeout range centered at 1.6 sec typical; the timer disables when WDI floats. Manual reset (MR) provides asynchronous reset initiation with guaranteed 200 ns propagation delay and full reset timeout hold after MR release.
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 | 2.93 V (typical) - monitors 3.3 V rail with ±30 mV hysteresis for noise-immune brownout detection. |
| SENSE2 Threshold | 2.25 V (typical) - monitors 2.5 V rail with ±20 mV hysteresis, enabling dual-rail supervision in mixed-voltage SoC domains. |
| Reset Timeout | 140 ms (min) - ensures stable power sequencing before processor release, masking transient startup dips. |
| Watchdog Timeout | 1.6 sec (typical) - provides sufficient margin for firmware execution loops while catching lockups. |
| Supply Current | 40 μA (max) - enables always-on supervision in battery-backed or ultra-low-power subsystems. |
| Operating Temp | −40°C to +85°C - qualified for extended industrial environments including automotive infotainment and telecom equipment. |
Pinout & Package
ADM13305-25ARZ is housed in an 8-lead narrow-body SOIC (SOIC_N, package code R-8), JEDEC MS-012-AA compliant, with 1.27 mm lead pitch and 5.00 mm × 4.00 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSE1 | Voltage Sense Input 1 | Monitors 3.3 V supply; asserts RESET if voltage falls below 2.93 V (−40°C to +85°C range: 2.86–3.02 V). |
| 2 SENSE2 | Voltage Sense Input 2 | Monitors 2.5 V supply; asserts RESET if voltage falls below 2.25 V (−40°C to +85°C range: 2.20–2.32 V). |
| 3 WDI | Watchdog Timer Input | Edge-triggered input; toggling within 1.6 sec prevents reset; floating disables watchdog function. |
| 4 GND | Ground Reference | System ground return path; requires low-impedance connection to minimize noise coupling into sense inputs. |
| 5 RESET | Active-Low Reset Output | Push-pull output; drives low during reset condition; sinks up to 3 mA at 5.5 V with VOL ≤ 0.4 V. |
| 6 RESET | Active-High Reset Output | Push-pull output; drives high during reset condition; sources up to 3 mA at 5.5 V with VOH ≥ VDD − 0.4 V. |
| 7 MR | Manual Reset Input | Active-low input; pulling low forces immediate reset; release triggers full 140 ms timeout before deassertion. |
| 8 VDD | Supply Voltage Input | Power input (2.7–5.5 V); RESET valid down to 1.1 V; requires 0.1 μF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Fixed Thresholds | 2.93 V / 2.25 V pair eliminates external resistor networks for 3.3 V/2.5 V rail monitoring. |
| Guaranteed Power-On Reset | RESET activates at VDD ≥ 1.1 V - ensures early fault detection before core logic powers up. |
| Independent Watchdog & Manual Reset | WDI and MR provide redundant reset initiation paths without interfering with each other's timing behavior. |
| Push-Pull Reset Outputs | Both RESET and RESET drive actively high/low - removes need for external pull-up/pull-down resistors. |
| Low Quiescent Current | 40 μA max IDD enables integration into always-on supervisory circuits without impacting system standby budget. |
Applications
| Baseband Processor Supervision | Notebook Platform Power Management |
|---|---|
Use Scenario: Monitoring 3.3 V I/O and 2.5 V core supplies in cellular baseband processors during cold boot and dynamic voltage scaling. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting synchronized reset to prevent illegal state entry during rail ramp-up or brownout. Use Value: Prevents corrupted register writes and bus contention by holding processor in reset until both rails stabilize above 2.93 V and 2.25 V respectively. | Use Scenario: Coordinating power sequencing across CPU, chipset, and memory rails in thin-and-light notebooks with tight thermal envelopes. IC Role / Device Role / Timing Role: Primary reset generator with watchdog fallback, interfacing directly to Intel PCH reset input and BIOS-controlled MR line. Use Value: Eliminates need for discrete RC timers and separate watchdog ICs, reducing BOM count and PCB area by 30% versus discrete solutions. |
| Industrial PLC Controller | Wireless Access Point Baseband |
Use Scenario: Ensuring deterministic restart after AC line sags or DC-DC converter transients in programmable logic controller mainboards. IC Role / Device Role / Timing Role: Fault-tolerant dual-supply monitor with manual reset button interface and watchdog coverage for firmware hang detection. Use Value: Maintains functional safety integrity by guaranteeing reset assertion for >140 ms even under 10% undershoot on either monitored rail. | Use Scenario: Supervising 3.3 V PHY and 2.5 V MAC voltage domains in 802.11ac access point SoCs operating in high-temperature enclosures. IC Role / Device Role / Timing Role: Temperature-stable supervisor with −40°C to +85°C threshold accuracy, feeding reset signals to ARM Cortex-A9 subsystem. Use Value: Enables reliable operation at 85°C ambient via guaranteed 2.20–2.32 V SENSE2 threshold window, avoiding false resets due to temp drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816EPA+ | Single-supply supervisor (2.5 V only); no watchdog; 200 ms timeout; DIP-8 package. | Lacks dual-rail monitoring and WDI functionality; suitable only for single-rail legacy systems. | Select only when redesign is constrained to through-hole assembly and 2.5 V-only supervision suffices. |
| TPS3808G33DBVR | Single-channel 3.3 V supervisor; adjustable watchdog (0.5–10 sec); SOT-23-6 package; 1.6 μA IQ. | Requires two devices for dual-rail coverage; lower IQ but no integrated 2.5 V channel or push-pull RESET. | Prefer for ultra-low-power battery applications where dual-rail supervision can be implemented discretely. |
Compared with MAX6816EPA+ and TPS3808G33DBVR, the ADM13305-25ARZ uniquely delivers matched 3.3 V/2.5 V supervision, integrated watchdog, and dual push-pull reset outputs in a single SOIC-8 footprint-reducing component count, layout complexity, and qualification effort for new designs requiring coordinated multi-rail reset.
Availability
ADM13305-25ARZ is available at Aetrix Electronics and suitable for notebook platform power management, industrial PLC controllers, and wireless access point baseband systems requiring stable component supply with full RoHS compliance and traceable lot control.
Supply support for ADM13305-25ARZ 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, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The ADM13305 family was engineered specifically for robust dual-rail supervision in DSP/microcontroller systems, emphasizing precision threshold stability over temperature, low-power operation, and seamless integration with manual reset and watchdog requirements.
FAQ
What is the exact voltage threshold configuration of the ADM13305-25ARZ?
The ADM13305-25ARZ features factory-trimmed thresholds of 2.93 V (SENSE1, for 3.3 V rail) and 2.25 V (SENSE2, for 2.5 V rail), with ±30 mV and ±20 mV hysteresis respectively across −40°C to +85°C. These values are specified in Table 1 of the Rev. 0 datasheet and confirmed in the Ordering Guide for model ADM13305-25ARZ.
Does the ADM13305-25ARZ require external components to operate?
No, the ADM13305-25ARZ operates autonomously with only a 0.1 μF VDD bypass capacitor recommended for noise immunity. Its dual fixed thresholds, internal watchdog oscillator, and push-pull reset outputs eliminate the need for external resistors, capacitors, or pull-up networks required by discrete or programmable supervisors.
Can the watchdog timer in the ADM13305-25ARZ be disabled?
Yes, the watchdog timer in the ADM13305-25ARZ is disabled when the WDI pin is left unconnected (floating). This allows safe operation in systems where software cannot guarantee periodic WDI toggling, while retaining full undervoltage supervision and manual reset capability.
What is the minimum VDD voltage at which ADM13305-25ARZ guarantees RESET assertion?
The ADM13305-25ARZ guarantees RESET assertion begins at VDD ≥ 1.1 V, per the "Power-Up Reset Voltage" specification (0.4 V, tested at IOL = 20 μA). This ensures early fault detection before downstream logic becomes active, and is validated across the full −40°C to +85°C temperature range.
Is the ADM13305-25ARZ pin-compatible with other ADM13305 variants?
Yes, all ADM13305 variants-including ADM13305-25ARZ, ADM13305-18ARZ, and ADM13305-33ARZ-share identical 8-lead SOIC_N (R-8) pinout and electrical timing characteristics. Only the internal threshold voltages differ; no PCB changes are needed when substituting between fixed-threshold models.
ADM13305-25ARZ 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:
- 2.25V, 2.93V
- 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
ADM13305-25ARZ FAQ
1.How can I place an order for ADM13305-25ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM13305-25ARZ 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 ADM13305-25ARZ reliable?
The price and inventory of ADM13305-25ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM13305-25ARZ is usually 5 days.
3.What payment methods are accepted for ADM13305-25ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM13305-25ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM13305-25ARZ?
ADM13305-25ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM13305-25ARZ 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 ADM13305-25ARZ?
For technical support, including ADM13305-25ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM13305-25ARZ requirements.
6.How does Aetrix verify that ADM13305-25ARZ is sourced from the original manufacturer or authorized distributors?
All ADM13305-25ARZ 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 ADM13305-25ARZ meets industry standards.
7.What is the process for return or replacement of ADM13305-25ARZ?
All ADM13305-25ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM13305-25ARZ, 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 ADM13305-25ARZ part is unused and in its original packaging.
Return procedure for ADM13305-25ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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