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Analog Devices Inc. LTC1326CS8-2.5#PBF
- Part No.:
- LTC1326CS8-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1326CS8-2.5#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:196
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Product details
Overview
LTC1326CS8-2.5#PBF from Analog Devices (formerly Linear Technology) is a micropower precision triple supply monitor IC designed for systems requiring simultaneous supervision of 2.5V, 3.3V, and an adjustable supply (VCCA). It delivers ±0.75% threshold accuracy, 20µA typical supply current, 200ms internal reset delay, active-low/open-drain RST and SRST outputs, and guaranteed reset assertion down to VCC3 ≥ 1V or VCC25 ≥ 1V - enabling reliable power-up sequencing in portable battery-powered equipment.
For engineers reviewing the LTC1326CS8-2.5#PBF datasheet, LTC1326CS8-2.5#PBF pinout, LTC1326CS8-2.5#PBF application, or LTC1326CS8-2.5#PBF equivalent, key selection considerations include its 2.5V/3.3V/ADJ monitoring capability, soft-reset pulse width (100µs typ), push-button debounce timing (20–35ms), glitch immunity, and compatibility with SO-8 and MSOP-8 packages for space-constrained designs.
Technical Context
The LTC1326CS8-2.5#PBF integrates three precision voltage comparators with 13µs typical response time and built-in 25mV hysteresis to suppress transients on VCC25, VCC3, and VCCA inputs. Its power-detect/gate-drive architecture selects the highest available supply (VCC25 or VCC3) to drive the RST output FET, ensuring valid reset assertion even when one supply drops below 1V.
It implements dual-mode reset control: a manual push-button input (PBR) triggers either a narrow "soft" reset (100µs SRST pulse) for DRAM-safe microprocessor resets or a full 200ms hard reset (RST) when held >2 seconds. The internal timer guarantees reset hold time independent of supply ramp rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | VCC25 (2.5V), VCC3 (3.3V), VCCA (adjustable ~1V); enables triple-rail validation before system release |
| Threshold Accuracy | ±0.75% over –40°C to +85°C; ensures deterministic reset timing across temperature without calibration |
| Quiescent Current | 20µA typical at VCC3 = 3.3V; supports multi-year battery life in always-on portable instrumentation |
| Reset Pulse Width | 200ms nominal (RST); provides sufficient hold time for CPU initialization and memory stabilization |
| Soft Reset Pulse Width | 100µs typical (SRST); short enough to avoid DRAM refresh interruption while resetting logic |
| Minimum Valid Supply | RST guaranteed low for VCC25 ≥ 1V or VCC3 ≥ 1V; enables early reset assertion during brownout |
| Input Voltage Range | VCC25/VCC3/VCCA: –0.5V to 7V; supports safe operation with transient overshoot or negative glitches |
Pinout & Package
Package: 8-Lead Plastic SO (SO-8, Narrow 0.150"), RoHS-compliant, lead-free (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V sense input & IC power rail | Primary supply for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor to GND |
| VCC25 (Pin 2) | 2.5V sense input | Used as gate-drive source for RST FET when VCC25 > VCC3; tied to VCC3 if unused |
| VCCA (Pin 3) | Adjustable threshold input (1V nominal) | High-impedance comparator input; can monitor logic rails or DC/DC feedback nodes |
| GND (Pin 4) | Ground reference | Common return for all supplies and outputs; requires low-impedance PCB connection |
| PBR (Pin 8) | Active-low push-button reset input | Internally pulled up to VCC3 (7µA); debounced (20–35ms); asserts soft/hard reset based on press duration |
| SRST (Pin 7) | Active-low open-drain soft reset output | 100µs pulse after short PBR press; OR-tie capable with other reset sources |
| RST (Pin 6) | Active-low open-drain hard reset output | 200ms pulse after power-up/brownout or long PBR press; driven by highest valid supply (VCC25 or VCC3) |
| RST (Pin 5) | Active-high CMOS reset output | Complementary buffered output of RST; drives high to VCC3; requires external pull-down if unused |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring with fixed 2.5V/3.3V thresholds | Eliminates need for external resistive dividers or multiple discrete supervisors in mixed-voltage systems |
| Guaranteed reset assertion down to 1V supply | Ensures fail-safe behavior during deep brownout conditions where many competitors lose functionality |
| Integrated soft-reset generation (100µs SRST) | Enables DRAM-safe processor reset without disrupting memory refresh cycles |
| Power-detect gate drive from highest valid supply | Maintains robust RST output drive even when primary supply collapses, using backup rail |
| 20µA ultra-low quiescent current | Reduces standby power in battery-critical applications such as handheld test equipment and medical sensors |
| Glitch-immune comparators with 25mV hysteresis | Rejects noise spikes up to 100µs duration without false triggering, per transient immunity curves |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Supervising 2.5V core, 3.3V I/O, and adjustable VCORE rails during cold boot and thermal throttling. IC Role / Device Role / Timing Role: Triple-rail supervisor providing synchronized 200ms reset release after all supplies stabilize above thresholds. Use Value: Prevents CPU lockup due to out-of-sequence power-up; eliminates need for discrete RC timers or FPGA-based sequencing logic. |
Use Scenario: Managing power states in ultraportable notebooks with dynamic voltage scaling and battery-backed RTC. IC Role / Device Role / Timing Role: Monitors 2.5V DDR interface, 3.3V peripheral bus, and adjustable 1V logic supply during suspend/resume transitions. Use Value: 20µA quiescent current extends battery shelf life; soft-reset preserves DRAM contents during quick wake-from-sleep events. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring clean startup of 2.5V ADC reference, 3.3V microcontroller, and adjustable sensor excitation supply in handheld DMMs. IC Role / Device Role / Timing Role: Precision supervisor with ±0.75% threshold tolerance guaranteeing accurate analog measurement integrity at power-on. Use Value: Eliminates calibration drift caused by marginal supply voltages; supports auto-ranging without firmware intervention. |
Use Scenario: Power management in wireless sensor nodes with 2.5V RF transceiver, 3.3V MCU, and adjustable 1.2V sensor bias rail. IC Role / Device Role / Timing Role: Low-power supervisor enabling multi-year operation on coin-cell batteries via 20µA sleep current and glitch-resistant monitoring. Use Value: Push-button soft reset allows field firmware updates without full power cycle, preserving nonvolatile configuration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1726-2.5 | Includes programmable watchdog timer and adjustable reset timeout; higher 35µA supply current | Required where system-level fault recovery (e.g., hung firmware) must be handled autonomously | Select LTC1726-2.5 when watchdog functionality is mandatory; LTC1326CS8-2.5#PBF is preferred for pure power-monitoring simplicity and lowest current draw |
| LTC1727-2.5 | Provides individual open-drain reset outputs per monitored rail (2.338V, 3.086V, 1V); ±1.5% threshold accuracy | Suitable when independent reset signaling per supply is needed for modular power domain control | Choose LTC1727-2.5 for rail-isolated reset assertion; LTC1326CS8-2.5#PBF offers tighter ±0.75% accuracy and lower cost for consolidated reset generation |
Compared with LTC1726-2.5 and LTC1727-2.5, the LTC1326CS8-2.5#PBF delivers superior threshold accuracy (±0.75% vs ±1.5%) and lowest quiescent current (20µA vs 35µA/25µA), making it optimal for cost-sensitive, battery-constrained applications where only consolidated reset signaling is required.
Availability
LTC1326CS8-2.5#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and portable battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1326CS8-2.5#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1326 family was designed specifically for micropower, high-accuracy triple-supply monitoring in space- and energy-constrained systems - emphasizing precision threshold detection, glitch immunity, and flexible reset generation without external components.
FAQ
What is the function of the PBR pin on the LTC1326CS8-2.5#PBF?
The PBR (Push-Button Reset) pin on the LTC1326CS8-2.5#PBF is an active-low logic input with internal 7µA pull-up to VCC3. When pulled low for less than ≈2 seconds, it generates a 100µs soft reset pulse on SRST; when held low >2 seconds, it triggers a full 200ms hard reset on RST. Its internal 20–35ms debounce prevents contact bounce from causing spurious resets.
Does the LTC1326CS8-2.5#PBF support monitoring a 5V supply?
No - the LTC1326CS8-2.5#PBF is specifically configured for 2.5V, 3.3V, and adjustable (VCCA) supply monitoring. For 5V systems, the pin-compatible LTC1326CS8 (non–2.5 variant) must be used, which monitors VCC5 (5V), VCC3 (3.3V), and VCCA. The -2.5 suffix denotes fixed 2.5V threshold on Pin 2, not 5V capability.
How does the LTC1326CS8-2.5#PBF ensure reset validity during brownout?
The LTC1326CS8-2.5#PBF guarantees RST remains asserted as long as VCC25 ≥ 1V or VCC3 ≥ 1V, even if both drop below their nominal thresholds. Its power-detect/gate-drive circuitry selects the highest valid supply to drive the RST output FET, ensuring logic-low reset output down to 1V - a critical feature for brownout resilience absent in many competing supervisors.
Can the LTC1326CS8-2.5#PBF be used with only two supplies?
Yes - the LTC1326CS8-2.5#PBF supports dual-supply operation. VCCA can be tied to VCC3 or VCC25 to disable its comparator; VCC25 may be tied to VCC3 if only 3.3V and adjustable monitoring is needed. The device's override functions allow flexible configuration as single-, dual-, or triple-supply monitor without external components.
What is the maximum operating temperature range for the LTC1326CS8-2.5#PBF?
The LTC1326CS8-2.5#PBF is rated for commercial temperature range: 0°C to +70°C. For extended industrial operation (–40°C to +85°C), the pin-compatible LTC1326IS8-2.5 or LTC1326IMS8-2.5 variants must be selected - the 'C' suffix in LTC1326CS8-2.5#PBF explicitly denotes the 0°C to 70°C grade.
LTC1326CS8-2.5#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:
- 2.363V, 3.118V, 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
LTC1326CS8-2.5#PBF FAQ
1.How can I place an order for LTC1326CS8-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326CS8-2.5#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 LTC1326CS8-2.5#PBF reliable?
The price and inventory of LTC1326CS8-2.5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326CS8-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1326CS8-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326CS8-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326CS8-2.5#PBF?
LTC1326CS8-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326CS8-2.5#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 LTC1326CS8-2.5#PBF?
For technical support, including LTC1326CS8-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326CS8-2.5#PBF requirements.
6.How does Aetrix verify that LTC1326CS8-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1326CS8-2.5#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 LTC1326CS8-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1326CS8-2.5#PBF?
All LTC1326CS8-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326CS8-2.5#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 LTC1326CS8-2.5#PBF part is unused and in its original packaging.
Return procedure for LTC1326CS8-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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