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Analog Devices Inc. LTC1727ES8-2.5#PBF
- Part No.:
- LTC1727ES8-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1727ES8-2.5#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
LTC1727ES8-2.5#PBF from Analog Devices is a micropower precision triple supply monitor in an 8-lead SO package, designed for systems requiring simultaneous monitoring of 2.5V, 3.3V, and an adjustable supply. It features ±1.5% threshold accuracy over temperature, 10µA typical supply current, 200ms reset delay, individual open-drain comparator outputs (COMP3, COMP25, COMPA), and guaranteed RST assertion down to VCC3 or VCC25 ≥ 1V. It is used in notebook computers and intelligent instruments where reliable power sequencing and brownout detection are critical.
For engineers reviewing the LTC1727ES8-2.5#PBF datasheet, LTC1727ES8-2.5#PBF pinout, LTC1727ES8-2.5#PBF application, or LTC1727ES8-2.5#PBF equivalent, key selection considerations include its triple-threshold architecture (2.338V/3.086V/1.000V), open-drain output drive capability (2.5mA sink), glitch-immune reset timing, and compatibility with 1V–7V operating voltage range across all monitored rails.
Technical Context
The LTC1727ES8-2.5#PBF implements three independent comparators-each with dedicated thresholds for VCC25 (2.338V typ), VCC3 (3.086V typ), and VCCA (1.000V typ)-feeding into a 200ms monostable pulse generator that controls the active-low RST output. Its internal bandgap reference enables stable operation across –40°C to +85°C, and power detect logic ensures RST remains asserted until all supplies exceed their trip points and remain valid for the full delay period.
Each comparator output (COMP3, COMP25, COMPA) is open-drain with weak internal 6µA pull-up to VCC3, allowing external pull-up to higher voltages (e.g., 5V logic). The device draws only 10µA typical supply current and guarantees correct RST state even when VCC3 or VCC25 drops to 1V, making it suitable for low-power embedded systems with mixed-voltage domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC25 Threshold | 2.338V typical; monitors 2.5V rail with ±1.5% accuracy over temperature - ensures precise undervoltage detection for core logic supplies. |
| VCC3 Threshold | 3.086V typical; monitors 3.3V I/O or system rail with same ±1.5% tolerance - maintains compatibility with standard 3.3V logic interfaces. |
| VCCA Threshold | 1.000V typical; high-impedance adjustable input for custom supply monitoring (e.g., DC/DC feedback node) - supports flexible system-level power good signaling. |
| Reset Delay | 200ms fixed; debounces power-up transients and prevents false resets during brownouts - meets microprocessor reset timing requirements. |
| Supply Current | 10µA typical; ultra-low quiescent draw enables use in battery-powered equipment without compromising runtime. |
| RST Output Sink | 2.5mA at 0.4V; robust open-drain drive supports direct interfacing with 3.3V/5V microcontroller reset inputs. |
| Operating Voltage | 1V to 7V on VCC3/VCC25/VCCA; guarantees functional RST assertion even during deep brownout conditions - enhances system reliability. |
Pinout & Package
Package: 8-Lead Plastic Small Outline (SO), narrow body (0.150 inch), lead-free finish, –40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 5) | 3.3V sense input & primary power supply | Provides internal bias when ≥ VCC25; must be bypassed with ≥0.1µF ceramic capacitor - defines reference for all comparator outputs and RST pull-up. |
| VCC25 (Pin 4) | 2.5V sense input & auxiliary power supply | Supplies device when > VCC3; enables operation from 2.5V domain - allows dual-supply autonomy in mixed-rail systems. |
| VCCA (Pin 3) | Adjustable threshold input (1.000V typ) | High-impedance monitor for custom supplies (e.g., DC/DC feedback); unused pin may tie to VCC3 or VCC25 - avoids threshold error from floating node. |
| GND (Pin 2) | Analog ground reference | Common return for all comparators and reset logic - requires low-impedance connection to minimize noise coupling into threshold detection. |
| COMPA (Pin 1) | VCCA comparator output | Active-high open-drain signal indicating VCCA ≥ 1.000V - enables discrete power-good indication for adjustable rail without software polling. |
| RST (Pin 6) | Master reset output | Active-low open-drain output held low until all three supplies meet thresholds for 200ms - directly drives µP reset pin with configurable pull-up voltage. |
| COMP25 (Pin 7) | VCC25 comparator output | Active-high open-drain signal indicating VCC25 ≥ 2.338V - provides per-rail status for diagnostics or fault isolation. |
| COMP3 (Pin 8) | VCC3 comparator output | Active-high open-drain signal indicating VCC3 ≥ 3.086V - decouples system reset from individual rail health for modular power management. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent monitoring | Simultaneous detection of 2.5V, 3.3V, and adjustable supply with dedicated comparator outputs - enables granular power domain visibility and selective fault response. |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to +85°C range - eliminates need for external calibration in industrial and computing applications. |
| 200ms glitch-immune reset | Monostable delay with built-in hysteresis and transient rejection - prevents spurious resets from short-duration supply dips or EMI. |
| 10µA ultra-low supply current | Enables permanent connection in always-on subsystems (e.g., RTC, wake-on-LAN) without measurable battery drain. |
| 1V minimum operating voltage | RST remains valid down to VCC3 or VCC25 = 1V - ensures fail-safe reset assertion during severe brownout or partial power loss. |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Monitoring ATX 3.3V, 2.5V CPU core, and 1.0V DDR termination supplies during boot and thermal throttling. IC Role / Device Role / Timing Role: Triple supply monitor providing synchronized reset release after all rails stabilize for 200ms - ensures BIOS execution begins only after stable power. Use Value: Prevents corrupted memory initialization and CPU lockup by enforcing strict power sequencing compliance with Intel VRD specs. | Use Scenario: Validating 3.3V platform controller hub (PCH), 2.5V GPU core, and adjustable 1.0V SoC I/O supply in compact form factor designs. IC Role / Device Role / Timing Role: Independent comparator outputs feed EC firmware for real-time rail health reporting; RST coordinates main processor startup. Use Value: Enables dynamic power management and graceful shutdown on single-rail failure - extends battery life and improves user experience. |
| Intelligent Instruments | Network Servers |
Use Scenario: Ensuring clean power-up of FPGA configuration, analog front-end, and isolated communication interface in portable test equipment. IC Role / Device Role / Timing Role: Monitors 3.3V FPGA bank, 2.5V ADC reference, and 1.0V DAC supply - asserts RST until all analog/digital domains settle. Use Value: Eliminates measurement offset drift and digital glitches caused by out-of-spec supply ramp rates - improves measurement repeatability. | Use Scenario: Coordinating power-on sequence across redundant 3.3V management controllers, 2.5V PHYs, and adjustable 1.0V ASIC supplies in multi-slot chassis. IC Role / Device Role / Timing Role: Provides hardware-enforced reset hold-off until all hot-swap modules report stable power - prevents backplane contention and bus arbitration errors. Use Value: Reduces field failure rate from power sequencing violations in carrier-grade infrastructure - meets NEBS Level 3 reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1326-2.5 | ±0.75% threshold accuracy (tighter), 2.363V/3.118V/1.000V thresholds, no individual comparator outputs - only RST. | Designed for PCI-compliant systems with stricter tFAIL timing; lacks per-rail status signals needed for diagnostics. | Select when highest threshold precision is required and per-rail monitoring is unnecessary. |
| LTC1726-2.5 | Adjustable reset timeout (10ms–10s), integrated watchdog timer, same 2.363V/3.118V/1.000V thresholds - adds system supervision beyond reset. | Targeted at systems requiring periodic firmware sanity checks; higher complexity and cost than basic monitoring. | Select when watchdog functionality and programmable reset duration are mandatory for safety-critical operation. |
Compared with LTC1326-2.5 and LTC1726-2.5, the LTC1727ES8-2.5#PBF offers unique value through its three independent open-drain comparator outputs - enabling real-time rail-by-rail status visibility without microcontroller intervention - while maintaining identical 2.5V/3.3V/adjustable monitoring capability and industry-standard SO-8 footprint.
Availability
LTC1727ES8-2.5#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC1727ES8-2.5#PBF 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, serving industrial, automotive, communications, and healthcare markets.
The LTC1727 product line delivers precision, low-power supply monitoring ICs optimized for computing and instrumentation systems requiring deterministic reset behavior and multi-rail power integrity assurance.
FAQ
What is the exact threshold voltage for the VCC25 input on the LTC1727ES8-2.5#PBF?
The VCC25 input threshold for the LTC1727ES8-2.5#PBF is 2.338V typical, with a guaranteed range of 2.300V to 2.375V over the full –40°C to +85°C operating temperature range. This value is specified in the Electrical Characteristics table under symbol VRT25 and applies specifically to the -2.5 variant, which monitors 2.5V, 3.3V, and an adjustable supply. The LTC1727ES8-2.5#PBF uses this threshold to assert COMP25 when VCC25 exceeds the trip point.
Can the LTC1727ES8-2.5#PBF monitor a 1.8V supply instead of 2.5V?
No, the LTC1727ES8-2.5#PBF is factory-configured for 2.5V/3.3V/adjustable monitoring and does not support 1.8V as a primary monitored rail. For 1.8V systems, Analog Devices specifies the LTC1728-1.8 or LTC1728-3.3 variants, which feature VCC18 (1.683V typ) and VCC3 (3.086V or 2.805V) thresholds. Using the LTC1727ES8-2.5#PBF for 1.8V would result in premature or failed detection since its VCC25 threshold (2.338V) is significantly higher than 1.8V.
How does the LTC1727ES8-2.5#PBF ensure reliable reset during brownout conditions?
The LTC1727ES8-2.5#PBF ensures reliable reset during brownout via two mechanisms: first, each comparator input includes inherent noise immunity due to slow response time that integrates ripple, and second, the RST output incorporates a 200ms monostable delay that holds reset asserted until all three supplies (VCC25, VCC3, VCCA) remain above their respective thresholds for the full duration. This prevents false releases caused by brief voltage sags. The LTC1727ES8-2.5#PBF also guarantees RST remains low down to VCC25 or VCC3 = 1V, extending detection range well below nominal rails.
What is the function of the COMPA pin on the LTC1727ES8-2.5#PBF?
The COMPA pin on the LTC1727ES8-2.5#PBF is the open-drain output of the adjustable-supply comparator, asserting high (pulled up externally or by internal 6µA current) when the VCCA input voltage exceeds its 1.000V typical threshold. It provides discrete power-good status for the adjustable rail - such as a DC/DC converter feedback node - independent of the master RST signal. Unlike RST, COMPA has no timing delay and tracks VCCA in near real time, enabling immediate fault response or status LED indication. The LTC1727ES8-2.5#PBF requires VCC3 or VCC25 ≥ 2V for COMPA to reach valid logic state.
Is the LTC1727ES8-2.5#PBF pin-compatible with other variants in the LTC1727/LTC1728 family?
Yes, the LTC1727ES8-2.5#PBF shares identical pinout and SO-8 package dimensions with all other LTC1727 variants (e.g., LTC1727ES8-5#PBF) and is electrically compatible with the LTC1728-2.5 in the same package - though the LTC1728 lacks individual comparator outputs (COMP3, COMP25, COMPA). All SO-8 versions use Pin 1 = COMPA, Pin 2 = GND, Pin 3 = VCCA, Pin 4 = VCC25, Pin 5 = VCC3, Pin 6 = RST, Pin 7 = COMP25, Pin 8 = COMP3. This allows drop-in replacement within the same voltage variant group when per-rail monitoring is not required.
LTC1727ES8-2.5#PBF 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:
- 3
- Voltage - Threshold:
- 2.338V, 3.086V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1727ES8-2.5#PBF FAQ
1.How can I place an order for LTC1727ES8-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1727ES8-2.5#PBF 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 LTC1727ES8-2.5#PBF reliable?
The price and inventory of LTC1727ES8-2.5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1727ES8-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1727ES8-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1727ES8-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1727ES8-2.5#PBF?
LTC1727ES8-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1727ES8-2.5#PBF 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 LTC1727ES8-2.5#PBF?
For technical support, including LTC1727ES8-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1727ES8-2.5#PBF requirements.
6.How does Aetrix verify that LTC1727ES8-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1727ES8-2.5#PBF 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 LTC1727ES8-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1727ES8-2.5#PBF?
All LTC1727ES8-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1727ES8-2.5#PBF, 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 LTC1727ES8-2.5#PBF part is unused and in its original packaging.
Return procedure for LTC1727ES8-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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