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Analog Devices Inc. ADM705ANZ
- Part No.:
- ADM705ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM705ANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,107
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Product details
Overview
ADM705ANZ from Analog Devices is a low-cost microprocessor supervisory circuit designed for 5 V supply monitoring in embedded systems. It provides guaranteed active-low RESET output down to VCC = 1 V, 4.65 V precision reset threshold, 200 ms reset pulse width, and integrated watchdog timer with 1.60 sec timeout. It is used in industrial controllers and critical power-up sequencing where reliable brownout detection and processor activity supervision are required.
For engineers reviewing the ADM705ANZ datasheet, ADM705ANZ pinout, ADM705ANZ application, or ADM705ANZ equivalent, key selection considerations include its 4.65 V reset threshold, watchdog input (WDI) and output (WDO) functionality, manual reset debouncing, and compatibility with TTL/CMOS logic levels across −40°C to +85°C operation.
Technical Context
The ADM705ANZ integrates a precision voltage monitor, a 1.60 sec watchdog timer, and a 1.25 V power-fail comparator with PFI/PFO interface. Its RESET output remains valid below 1 V VCC, enabling robust shutdown behavior during deep undervoltage conditions.
It features an internally debounced TTL/CMOS-compatible MR input, 190 μA quiescent current, and dual reset assertion sources - power-supply brownout and manual reset - both triggering a 200 ms active-low RESET pulse. The WDI input accepts transitions to clear the watchdog counter; failure to toggle within 1.60 sec forces WDO low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±150 mV - triggers RESET when VCC drops below this level, ensuring reliable power-on reset for 5 V systems. |
| Reset Pulse Width | 200 ms typical - holds microprocessor in reset long enough for stable power and clock initialization. |
| Watchdog Timeout | 1.60 sec - detects software lockup by requiring periodic WDI toggling; timeout asserts WDO low. |
| Supply Current | 190 μA typical - enables low-power operation in battery-backed or energy-sensitive applications. |
| Valid RESET Down to | VCC = 1 V - guarantees reset assertion integrity even during severe brownout or battery depletion. |
| Power-Fail Comparator Threshold | 1.25 V - monitors auxiliary supplies via PFI; PFO asserts low when monitored voltage falls below threshold. |
| MR Input Threshold | Logic Low ≤0.8 V, Logic High ≥2.0 V - supports direct connection to TTL/CMOS outputs or mechanical switches. |
Pinout & Package
ADM705ANZ is housed in an 8-lead narrow-body plastic dual-in-line package (PDIP, N-8), compliant with JEDEC MS-001-BA. Pin spacing is 0.100 inch (2.54 mm), body width 0.240–0.250 inch (6.10–6.35 mm), and total length 0.355–0.400 inch (9.02–10.16 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Debounced TTL/CMOS-compatible input; pulling below 0.8 V initiates 200 ms RESET pulse; internal 250 μA pull-up. |
| 2 - VCC | Power Supply Input | 5 V nominal supply input; requires 0.1 μF decoupling capacitor to GND for noise immunity. |
| 3 - GND | Ground Reference | 0 V reference for all internal circuits and I/O pins; must be low-impedance connection. |
| 4 - PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via resistive divider; connect to GND if unused. |
| 5 - PFO | Power-Fail Output | Active-low open-drain output; goes low when PFI < 1.25 V, signaling early power failure or low-battery condition. |
| 6 - WDI | Watchdog Input | Three-level input; toggling (high↔low) resets 1.60 sec watchdog timer; floating disables watchdog function. |
| 7 - RESET | Reset Output | Active-low push-pull output; asserted low during power-up, brownout, or MR activation; remains valid down to VCC = 1 V. |
| 8 - WDO | Watchdog Output | Active-low open-drain output; goes low on watchdog timeout or VCC < reset threshold; can drive NMI or MR for system reset. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET at VCC = 1 V | Ensures fail-safe microprocessor hold-down during deep undervoltage events, preventing erratic execution. |
| Integrated Watchdog Timer | 1.60 sec timeout with WDI/WDO interface enables autonomous software lockup detection without external components. |
| Dual Reset Sources | Simultaneous support for power-supply brownout and manual reset (MR), both generating synchronized 200 ms RESET pulses. |
| Power-Fail Warning (PFI/PFO) | 1.25 V comparator allows early warning of supply collapse or battery depletion, enabling graceful shutdown routines. |
| TTL/CMOS-Compatible MR Input | Eliminates need for external level-shifting or debouncing circuitry when interfacing with logic or switches. |
Applications
| Industrial PLCs | Embedded Data Loggers |
|---|---|
Use Scenario: Power cycling and firmware updates in remote, unattended control cabinets subject to grid instability. IC Role / Device Role / Timing Role: Supervises 5 V rail integrity and processor activity; asserts RESET on brownout and triggers watchdog-based recovery on software hang. Use Value: Prevents corrupted configuration writes and ensures deterministic boot after power interruption using 200 ms reset hold time and 1.60 sec watchdog timeout. |
Use Scenario: Battery-powered environmental sensor nodes logging data over weeks; low quiescent current extends operational life. IC Role / Device Role / Timing Role: Monitors main 5 V supply and backup battery via PFI; generates PFO interrupt before voltage collapse to initiate flash save and sleep entry. Use Value: Enables reliable last-data-save operation using 1.25 V PFI threshold and sub-200 μA supply current, preserving battery capacity. |
| Medical Diagnostic Instruments | Point-of-Sale Terminals |
Use Scenario: Critical startup sequence in imaging equipment where improper initialization may cause hardware damage or misdiagnosis. IC Role / Device Role / Timing Role: Provides power-on reset with 4.65 V threshold and 200 ms delay, ensuring FPGA, ADC, and memory subsystems stabilize before CPU release. Use Value: Guarantees safe, repeatable boot under varying AC line conditions using RESET validity down to 1 V VCC and precise threshold hysteresis. |
Use Scenario: Transaction-interrupt resilience in retail terminals exposed to frequent power glitches during credit card swipes. IC Role / Device Role / Timing Role: Detects momentary dips via 4.65 V reset threshold and asserts RESET; MR input synchronizes with hardware reset button. Use Value: Eliminates transaction corruption by enforcing full system reset on sub-cycle brownouts, supported by debounced MR and 200 ms pulse width. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705CPA+ | 4.65 V reset threshold, 200 ms reset pulse, no watchdog timer; 120 μA supply current; PDIP-8 package. | Lacks WDI/WDO functionality; suitable only where watchdog supervision is not required. | Select when cost sensitivity outweighs need for software activity monitoring and PFI/PFO capability. |
| TPS3808G33DBVR | 3.3 V reset threshold, adjustable watchdog timeout (1.25 ms–10 s), 1.6 μA quiescent current, SOT-23-6 package. | Designed for 3.3 V systems; smaller footprint; lower power but incompatible voltage threshold and package. | Choose for ultra-low-power 3.3 V designs requiring programmable watchdog timing; not drop-in for 5 V ADM705ANZ use cases. |
Compared with MAX705CPA+, ADM705ANZ adds watchdog supervision and power-fail warning at higher quiescent current; compared with TPS3808G33DBVR, it targets 5 V systems with fixed timing and larger PDIP packaging for legacy board compatibility.
Availability
ADM705ANZ is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic instruments, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.
Supply support for ADM705ANZ 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, and communications applications.
The ADM705/ADM706 family was designed specifically for robust 5 V microprocessor supervision - delivering guaranteed reset operation down to 1 V, integrated watchdog, and power-fail warning in compact PDIP/SOIC packages.
FAQ
What is the reset threshold voltage for ADM705ANZ?
The ADM705ANZ has a nominal reset threshold of 4.65 V, with a tolerance of ±150 mV (4.50 V to 4.75 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The threshold ensures reliable power-on reset and brownout detection for standard 5 V microprocessor systems. ADM705ANZ maintains this specification without external calibration or trimming components.
Does ADM705ANZ include a watchdog timer?
Yes, ADM705ANZ includes a dedicated watchdog timer with a nominal timeout period of 1.60 seconds. The timer is cleared by any transition (high-to-low or low-to-high) on the WDI pin. If no transition occurs within 1.60 seconds, the WDO pin goes low. This feature enables autonomous detection of software hangs in microprocessor-based systems without requiring additional ICs.
Can ADM705ANZ monitor a secondary power supply?
Yes, ADM705ANZ can monitor a secondary supply using its PFI (Power-Fail Input) pin and associated 1.25 V internal reference. By connecting the secondary supply through a resistive divider to PFI, the device asserts PFO low when the derived voltage falls below 1.25 V. This allows early warning of auxiliary rail collapse - for example, detecting backup battery depletion before main supply failure.
What is the minimum VCC voltage at which ADM705ANZ guarantees valid RESET output?
ADM705ANZ guarantees valid active-low RESET output down to VCC = 1 V. Below this level, internal transistor drive weakens, but the device remains functional through the full 1.0 V to 5.5 V operating range. This capability ensures deterministic microprocessor hold-down during deep brownout or battery discharge scenarios, a key differentiator versus many competing supervisors.
Is ADM705ANZ RoHS compliant?
Yes, ADM705ANZ is RoHS compliant, as indicated by the "Z" suffix in its ordering code. It meets EU Directive 2011/65/EU requirements for restriction of hazardous substances, including lead-free terminations and compliant molding compounds. Full compliance documentation, including material declarations and test reports, is available through Analog Devices' official product page and Aetrix Electronics' quality portal.
ADM705ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM705ANZ FAQ
1.How can I place an order for ADM705ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM705ANZ 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 ADM705ANZ reliable?
The price and inventory of ADM705ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM705ANZ is usually 5 days.
3.What payment methods are accepted for ADM705ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM705ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM705ANZ?
ADM705ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM705ANZ 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 ADM705ANZ?
For technical support, including ADM705ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM705ANZ requirements.
6.How does Aetrix verify that ADM705ANZ is sourced from the original manufacturer or authorized distributors?
All ADM705ANZ 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 ADM705ANZ meets industry standards.
7.What is the process for return or replacement of ADM705ANZ?
All ADM705ANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM705ANZ, 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 ADM705ANZ part is unused and in its original packaging.
Return procedure for ADM705ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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