My Inquiry
My Account
Analog Devices Inc. ADM709LAR
- Part No.:
- ADM709LAR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM709LAR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,703
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADM709LAR from Analog Devices is a precision power supply monitor IC with active-low reset output, 4.65 V threshold, 140 ms minimum power-on reset pulse, and operation down to 1 V supply voltage; used for reliable microprocessor reset in industrial control and embedded systems.
For engineers reviewing the ADM709LAR datasheet, ADM709LAR pinout, ADM709LAR application, or ADM709LAR equivalent, key selection considerations include reset threshold accuracy, guaranteed reset assertion below 1 V, glitch-immune VCC monitoring, and SOIC-8 compatibility for space-constrained PCB layouts.
Technical Context
The ADM709LAR integrates a precision voltage comparator and internal timer to generate a clean, debounced active-low RESET signal during power-up, brownout, and power-down events. Its reset threshold is fixed at 4.65 V ±0.15 V and remains stable across –40°C to +85°C.
VCC-to-RESET delay is under 20 µs, and the RESET output remains functional with VCC as low as 1.0 V-enabling robust shutdown sequencing. The device draws only 35 µA quiescent current at VCC < 3.6 V and supports sink currents up to 3.2 mA at the RESET pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.15 V - ensures reliable detection of +5 V supply undervoltage before system instability. |
| Power-On Reset Pulse | 140 ms (min) - provides sufficient time for microprocessor and power supply stabilization after VCC rise. |
| VCC Operating Range | 1.0 V to 5.5 V - enables valid RESET assertion even during deep brownout or controlled shutdown. |
| Quiescent Current | 35 µA (typ) at VCC < 3.6 V - minimizes standby power in battery-backed or low-power embedded systems. |
| RESET Output Sink Current | 3.2 mA - drives standard TTL/CMOS inputs without external buffering in most µP interfaces. |
| Glitch Immunity | Immune to short VCC transients - prevents spurious resets caused by power rail noise or switching spikes. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability in harsh environmental conditions. |
Pinout & Package
ADM709LAR is housed in an 8-lead SOIC (SO-8) package with standard JEDEC MS-012AC dimensions and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect | Internally unconnected; must remain floating-no routing or soldering required. |
| 2 | VCC Supply Input | Primary power input; accepts 1.0 V to 5.5 V; requires local 0.1 µF decoupling capacitor. |
| 3 | GND | Analog ground reference; must be tied directly to system ground plane with low-inductance connection. |
| 7 | RESET Output | Active-low open-drain output; sinks up to 3.2 mA; requires external pull-up for logic-high state. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65 V threshold | ±0.15 V tolerance over temperature ensures consistent +5 V supply monitoring without calibration. |
| 140 ms min power-on reset | Guaranteed minimum timeout eliminates race conditions during µP initialization and clock stabilization. |
| Operation down to 1 V VCC | Enables fail-safe reset hold during deep brownout-critical for data retention and orderly shutdown. |
| Glitch-immune VCC sensing | Rejects sub-20 µs transients on VCC, preventing false resets in noisy industrial power environments. |
| SOIC-8 footprint | Standard surface-mount package compatible with automated assembly and reflow profiles per JEDEC J-STD-020. |
Applications
| Industrial PLC Controllers | Embedded Data Acquisition Systems |
|---|---|
Use Scenario: Power cycling and brownout recovery in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: System-level reset supervisor ensuring deterministic µP restart after AC line sags or backup battery transitions. Use Value: Prevents firmware corruption and I/O lockup by holding reset until VCC stabilizes above 4.65 V and maintaining it for ≥140 ms. | Use Scenario: Reliable boot sequencing in portable environmental sensors powered by Li-ion or energy-harvesting sources. IC Role / Device Role / Timing Role: Low-voltage-aware reset generator that asserts RESET down to 1.0 V VCC to safeguard flash writes during power collapse. Use Value: Eliminates need for external voltage supervisors or discrete RC timing networks-reducing BOM count and board area. |
| Automotive Body Control Modules | Medical Diagnostic Instrumentation |
Use Scenario: Cold-cranking and load-dump resilience in 12 V–regulated subsystems powering microcontrollers in vehicle body electronics. IC Role / Device Role / Timing Role: Immune-to-glitch power monitor interfacing with bidirectional µP reset pins via 4.7 kΩ series resistor. Use Value: Avoids spurious resets during alternator transients while guaranteeing clean power-on reset after ignition cycle. | Use Scenario: Fail-safe startup and fault recovery in FDA-cleared handheld diagnostic devices requiring traceable power integrity. IC Role / Device Role / Timing Role: Precision reset supervisor with documented thermal stability (–40°C to +85°C) and ESD >5 kV for clinical environment robustness. Use Value: Meets IEC 60601-1 auxiliary power supply monitoring requirements without additional qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709CSA+ | 4.65 V threshold, 200 ms reset timeout, higher quiescent current (120 µA typ), same SO-8 package. | Designed for legacy Maxim designs; lacks 1 V operational guarantee and lower glitch immunity spec. | Use when drop-in replacement for existing MAX709-based boards is needed-pinout and function match but timing differs. |
| TPS3808G33DBVR | 3.3 V threshold (not 4.65 V), adjustable delay option, 1.5 µA quiescent current, SOT-23-6 package. | Optimized for ultra-low-power +3.3 V systems-not suitable for +5 V monitoring without external divider. | Select for new low-power designs where 4.65 V threshold is not required and board space is constrained. |
Compared with MAX709CSA+ and TPS3808G33DBVR, the ADM709LAR uniquely combines 4.65 V precision threshold, 1 V minimum operating voltage, and industrial temperature range in SO-8-making it optimal for legacy +5 V µP systems needing robust brownout response without layout changes.
Availability
ADM709LAR is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical diagnostic instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for ADM709LAR 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADM709 belongs to Analog Devices' precision power monitoring product line, engineered specifically for deterministic microprocessor reset generation in industrial, automotive, and medical systems where supply voltage integrity is mission-critical.
FAQ
What is the exact reset threshold voltage of the ADM709LAR?
The ADM709LAR has a nominal reset threshold of 4.65 V, with a guaranteed range of 4.50 V to 4.75 V across the full operating temperature range of –40°C to +85°C. This value is laser-trimmed at wafer test and does not require external calibration. The ADM709LAR threshold is specified independently of supply voltage variation and remains stable under typical PCB thermal gradients encountered in industrial enclosures.
Does the ADM709LAR support operation below 2.0 V VCC?
Yes-the ADM709LAR RESET output remains fully functional with VCC as low as 1.0 V, enabling reliable hold-reset behavior during deep brownout or controlled shutdown. Below 1.0 V, a 100 kΩ pull-down resistor between RESET and GND is recommended to ensure logic-low state. This capability is explicitly tested and guaranteed per the datasheet's "RESET at Voltages < 1 V" section.
Is the ADM709LAR pin-compatible with the MAX709?
Yes-the ADM709LAR is a direct functional and pin-compatible upgrade for the MAX709 in SO-8 packages. Both share identical pin 2 (VCC), pin 3 (GND), and pin 7 (RESET) assignments, with no-connect pins in the same locations. No PCB layout changes are required when replacing MAX709CSA+ or MAX709ESA+ with ADM709LAR, though timing differences (e.g., 140 ms vs. 200 ms reset pulse) should be verified in the target system.
What is the maximum sink current capability of the ADM709LAR RESET pin?
The ADM709LAR RESET pin can sink up to 3.2 mA while maintaining a logic-low voltage ≤0.4 V, as specified for ADM709L/M variants at VCC = reset threshold minimum. This allows direct interface with standard TTL and CMOS microprocessor reset inputs without external drivers. For higher-current loads or level-shifting, a buffer or MOSFET stage is recommended-but not required for typical µP applications.
How does the ADM709LAR handle power supply glitches?
The ADM709LAR incorporates internal filtering to reject short-duration transients on the VCC line-specifically immune to glitches under 20 µs. This prevents false resets caused by switching noise or EMI. Additional immunity can be achieved by placing a 0.1 µF ceramic capacitor as close as possible to the VCC pin, as shown in the Typical Operating Circuit diagram in the official ADM709 datasheet.
ADM709LAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM709LAR FAQ
1.How can I place an order for ADM709LAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709LAR 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 ADM709LAR reliable?
The price and inventory of ADM709LAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709LAR is usually 5 days.
3.What payment methods are accepted for ADM709LAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709LAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709LAR?
ADM709LAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709LAR 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 ADM709LAR?
For technical support, including ADM709LAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709LAR requirements.
6.How does Aetrix verify that ADM709LAR is sourced from the original manufacturer or authorized distributors?
All ADM709LAR 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 ADM709LAR meets industry standards.
7.What is the process for return or replacement of ADM709LAR?
All ADM709LAR units undergo pre-shipment inspection (PSI). If there is an issue with ADM709LAR, 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 ADM709LAR part is unused and in its original packaging.
Return procedure for ADM709LAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM709LAR Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
