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Analog Devices Inc. LTC1326CS8#PBF
- Part No.:
- LTC1326CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1326CS8#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:139
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Product details
Overview
LTC1326CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower precision triple supply monitor IC designed for systems requiring simultaneous supervision of 3.3V, 2.5V, and an adjustable voltage rail. It delivers ±0.75% threshold accuracy, 20µA typical supply current, 200ms internal reset delay, active-low/open-drain RST and SRST outputs, and manual push-button reset functionality - enabling reliable power-on, brownout, and user-initiated reset in portable and embedded computing platforms.
For engineers reviewing the LTC1326CS8#PBF datasheet, LTC1326CS8#PBF pinout, LTC1326CS8#PBF application, or LTC1326CS8#PBF equivalent, key selection considerations include its dual-supply monitoring flexibility (3.3V + 2.5V), guaranteed RST assertion down to VCC3 ≥ 1V, glitch-immune comparators with 13µs response, and compatibility with SO-8 and MSOP-8 footprints for space-constrained designs.
Technical Context
The LTC1326CS8#PBF integrates three precision voltage comparators - one each for VCC3 (3.3V), VCC25 (2.5V), and VCCA (adjustable ~1V) - with independent trip thresholds and shared 200ms reset timer. Its power-detect/gate-drive architecture selects the highest available supply (VCC3 or VCC25) to drive the RST output FET, ensuring valid reset assertion even when only one supply reaches 1V.
It implements dual-mode reset generation: a 100µs soft reset (SRST) triggered by sub-2-second PBR assertion, and a full 200ms hard reset (RST) initiated after >2 seconds of PBR hold. Both RST and SRST are open-drain with weak internal 6µA pull-ups to VCC3, supporting OR-tie with other reset sources without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC3 Threshold | 3.118V typ (±0.75% accuracy); ensures precise 3.3V rail monitoring with minimal false triggers during transients |
| VCC25 Threshold | 2.363V typ (±0.75% accuracy); enables accurate supervision of 2.5V logic or core supplies |
| VCCA Threshold | 1.000V typ (±0.75% accuracy); supports adjustable supply monitoring via external divider |
| Supply Current | 20µA typ at VCC3 = 3.3V; enables battery-powered operation for >10 years in low-duty-cycle systems |
| Reset Delay | 200ms nominal; meets standard power-on reset timing requirements for microcontrollers and FPGAs |
| Soft Reset Width | 100µs typ; allows DRAM refresh preservation during user-triggered resets |
| Operating Temp | 0°C to 70°C (Commercial grade); validated for desktop, notebook, and industrial control environments |
Pinout & Package
Package: 8-Lead Plastic SO (Small Outline, Narrow 0.150") - RoHS-compliant, lead-free (#PBF), JEDEC MS-012AC compliant, θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V Sense Input & IC Power Supply | Primary power source for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor to GND |
| VCC25 (Pin 2) | 2.5V Sense Input | Secondary supply input used for gate drive of RST FET when VCC25 > VCC3; tied to VCC3 if unused |
| VCCA (Pin 3) | Adjustable Threshold Input | High-impedance 1V comparator input; accepts external resistor divider for custom trip point (e.g., 1.8V, 2.8V) |
| GND (Pin 4) | Ground Reference | Analog and digital ground return; requires low-inductance connection to system ground plane |
| PBR (Pin 8) | Push-Button Reset Input | Active-low logic input with 7µA internal pull-up to VCC3; debounced internally (35ms typ) to reject mechanical switch bounce |
| SRST (Pin 7) | Soft Reset Output | Open-drain active-low output; asserts 100µs pulse on PBR release (if held <2s); compatible with 5V logic when pulled up to VCC3 |
| RST (Pin 6) | Hard Reset Output | Open-drain active-low output; asserts 200ms pulse after power-up or PBR hold >2s; guaranteed low until all supplies exceed thresholds |
| RST (Pin 5) | Complementary Reset Output | CMOS active-high buffered complement of RST; drives high to VCC3; enables direct interface to 3.3V logic without level shifters |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 20µA typical supply current enables multi-year battery life in portable instrumentation and handheld devices |
| Triple Independent Monitoring | Simultaneous supervision of 3.3V, 2.5V, and adjustable rail eliminates need for multiple discrete supervisors |
| Glitch-Immune Comparators | 13µs response time + 0.1µF per-input bypassing suppresses transient-induced false resets in noisy power environments |
| Two-Mode Reset Control | Hardware-selectable soft reset (100µs) and hard reset (200ms) via single PBR pin simplifies front-panel reset design |
| Supply-Fail Robustness | RST guaranteed valid down to VCC3 ≥ 1V or VCC25 ≥ 1V - critical for orderly shutdown in brownout conditions |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Supervising 3.3V I/O, 2.5V core, and adjustable DDR termination voltage in ATX mainboards. IC Role / Device Role / Timing Role: Triple-supply monitor providing synchronized power-on reset and brownout detection across multiple voltage domains. Use Value: Prevents CPU lockup and BIOS corruption by asserting RST until all rails stabilize within ±0.75% tolerance. | Use Scenario: Managing power sequencing for 3.3V chipset, 2.5V GPU, and 1.05V CPU core in ultra-thin clamshell designs. IC Role / Device Role / Timing Role: Micropower supervisor enabling instant-on capability and extended battery runtime via 20µA quiescent current. Use Value: Eliminates need for external RC timing networks while guaranteeing 200ms reset hold time for embedded controllers. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring reliable boot and fault recovery in handheld multimeters with dual 3.3V/2.5V ADC and display subsystems. IC Role / Device Role / Timing Role: Precision voltage monitor with 1V VCCA input used to supervise low-voltage analog reference rails. Use Value: ±0.75% threshold accuracy prevents spurious resets during battery discharge curves near end-of-life. | Use Scenario: Providing fail-safe reset for Bluetooth SoC (3.3V), PMIC (2.5V), and sensor interface (adjustable 1.8V) in wearable health monitors. IC Role / Device Role / Timing Role: Dual-mode reset generator delivering 100µs soft reset for firmware updates and 200ms hard reset for power cycling. Use Value: Preserves DRAM contents during user-initiated resets while ensuring full hardware initialization on cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1727-2.5 | Individual open-drain reset outputs per rail (RST3, RST25, RSTA); ±1.5% threshold accuracy vs. ±0.75% | Supports rail-isolated reset signaling; lacks integrated soft-reset function and PBR debounce | Choose when independent reset control per supply is required, not just combined assertion |
| LTC2903 | Single fixed 2.5V/3.3V/5V monitor in SOT-23; no adjustable input; 1.2µA quiescent current; no PBR or soft reset | Ultra-low-power option for single-rail systems; incompatible with triple-monitoring or push-button use cases | Choose only for cost-optimized, single-supply applications where micropower (<2µA) outweighs feature set |
Compared with LTC1727-2.5 and LTC2903, the LTC1326CS8#PBF uniquely combines ±0.75% accuracy, integrated soft/hard reset modes, and 3.3V/2.5V/adjustable monitoring in a single SO-8 package - making it optimal for compact, feature-rich embedded systems requiring both precision and user interaction.
Availability
LTC1326CS8#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.
Supply support for LTC1326CS8#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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering resources for legacy Linear parts.
The LTC1326 family belongs to Linear's precision power supervision product line, engineered specifically for high-accuracy, low-quiescent-current monitoring of multi-rail systems in computing and portable electronics.
FAQ
What supply voltages does the LTC1326CS8#PBF monitor?
The LTC1326CS8#PBF monitors three supplies: VCC3 (3.3V rail), VCC25 (2.5V rail), and VCCA (adjustable rail, typically configured for 1.0V but scalable via external resistor divider). It guarantees RST assertion if any monitored supply drops below its ±0.75% accurate threshold, and remains asserted for 200ms after all supplies recover.
Does the LTC1326CS8#PBF support both soft and hard reset functions?
Yes, the LTC1326CS8#PBF supports dual-mode reset via its PBR pin: holding PBR low for less than 2 seconds generates a 100µs soft reset pulse on SRST, preserving DRAM refresh; holding PBR low for more than 2 seconds triggers a full 200ms hard reset on RST. This eliminates need for separate reset ICs in systems requiring both user-initiated and power-fail reset paths.
Can the LTC1326CS8#PBF operate with only two supply rails?
Yes, the LTC1326CS8#PBF supports dual- and single-supply configurations. VCC25 can be tied to VCC3 to disable 2.5V monitoring, and VCCA can be tied to VCC3 or left floating (with internal pull-up) to disable the adjustable rail. The device automatically adapts its reset behavior based on active inputs, maintaining full functionality with reduced rail count.
What is the minimum operating voltage for guaranteed RST assertion on the LTC1326CS8#PBF?
The LTC1326CS8#PBF guarantees correct RST logic state (low) for VCC3 ≥ 1V or VCC25 ≥ 1V. This ensures reliable reset assertion during brownout conditions well before most 3.3V or 2.5V logic fails, enabling controlled shutdown sequences in battery-powered systems.
Is the LTC1326CS8#PBF pin-compatible with other Linear/Analog Devices supervisors?
No, the LTC1326CS8#PBF has a unique 8-pin SO/MSOP pinout optimized for triple-supply monitoring and push-button integration. While functionally similar parts like LTC1727-2.5 offer individual rail outputs, they use different pin assignments and lack PBR/SRST functionality - requiring PCB layout changes for substitution.
LTC1326CS8#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:
- 3.118V, 4.725V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1326CS8#PBF FAQ
1.How can I place an order for LTC1326CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326CS8#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 LTC1326CS8#PBF reliable?
The price and inventory of LTC1326CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1326CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326CS8#PBF?
LTC1326CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326CS8#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 LTC1326CS8#PBF?
For technical support, including LTC1326CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326CS8#PBF requirements.
6.How does Aetrix verify that LTC1326CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1326CS8#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 LTC1326CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1326CS8#PBF?
All LTC1326CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326CS8#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 LTC1326CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1326CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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