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Analog Devices Inc. LTC1326CMS8-2.5#TRPBF
- Part No.:
- LTC1326CMS8-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1326CMS8-2.5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,252
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Product details
Overview
LTC1326CMS8-2.5#TRPBF 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 voltage rail. It delivers ±0.75% threshold accuracy, 20µA typical supply current, and guaranteed reset assertion down to VCC3 ≥ 1V or VCC25 ≥ 1V. It is used in portable battery-powered equipment and intelligent instruments where reliable power-on reset and brownout detection are critical.
For engineers reviewing the LTC1326CMS8-2.5#TRPBF datasheet, LTC1326CMS8-2.5#TRPBF pinout, LTC1326CMS8-2.5#TRPBF application, or LTC1326CMS8-2.5#TRPBF equivalent, key selection considerations include its 2.5V/3.3V/ADJ monitoring capability, 200ms internal reset delay, manual push-button soft/hard reset functionality, open-drain RST/SRST outputs, and MSOP-8 package compatibility with space-constrained designs.
Technical Context
The LTC1326CMS8-2.5#TRPBF integrates three precision voltage comparators with 13µs typical response time and built-in glitch immunity to suppress transients on VCC25, VCC3, and VCCA inputs. Its power-detect/gate-drive architecture selects the highest available supply (VCC3 or VCC25) to drive the RST output FET, ensuring valid reset signaling even during asymmetric power-up sequences.
It supports flexible configuration: VCCA serves as a 1V-threshold logic input or adjustable supply monitor; VCC25 and VCCA can be tied to VCC3 for dual- or single-supply operation; and PBR debouncing (20–35ms) plus 2-second mode transition enables deterministic soft (100µs) vs hard (200ms) reset generation without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC25 Threshold | 2.363V (typ), ±0.75% accuracy - ensures precise 2.5V rail supervision across temperature |
| VCC3 Threshold | 3.118V (typ), ±0.75% accuracy - guarantees correct 3.3V supply validation before system release |
| VCCA Threshold | 1.000V (typ), ±0.75% accuracy - enables reliable low-voltage logic-level or DC/DC feedback monitoring |
| Supply Current | 20µA (typ) at TA = 25°C - supports ultra-low-power battery operation over full temperature range |
| Reset Delay | 200ms (nominal) after all supplies exceed thresholds - meets standard power-on reset timing requirements |
| Soft Reset Width | 100µs (typ) - provides narrow pulse for DRAM-refresh-preserving microprocessor reset |
| Operating Temp | –40°C to +85°C - qualified for industrial embedded and portable equipment environments |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, JEDEC MO-187 variant. Thermal resistance θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V Sense Input & IC Power Supply | Main power source for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor to GND |
| VCC25 (Pin 2) | 2.5V Sense Input | Supplies gate drive for RST FET when VCC25 > VCC3; if unused, tie to VCC3 |
| VCCA (Pin 3) | Adjustable Supply / 1V Logic Input | High-impedance comparator input with 1.000V threshold; usable for DC/DC feedback or logic-level sensing |
| GND (Pin 4) | Ground Reference | Common return path for all internal comparators and outputs |
| PBR (Pin 8) | Push-Button Reset Input | Active-low, internally pulled up to VCC3 (7µA); debounced input enabling soft/hard reset mode selection |
| SRST (Pin 7) | Soft Reset Output | Open-drain active-low output; asserts 100µs pulse after short PBR press; OR-tie capable |
| RST (Pin 6) | Primary Reset Output | Open-drain active-low output; asserted for 200ms after power-up/brownout or long PBR press |
| RST (Pin 5) | Complementary Reset Output | CMOS active-high buffered complement of RST; drives to VCC3; requires external pull-down if used |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent supply monitoring | Simultaneous supervision of 2.5V, 3.3V, and adjustable rail eliminates need for multiple discrete supervisors |
| ±0.75% threshold accuracy | Guaranteed over –40°C to +85°C ensures reliable reset timing without false triggers during thermal cycling |
| 20µA micropower operation | Enables multi-year battery life in portable instrumentation and handheld devices |
| Integrated soft/hard reset logic | Single PBR pin delivers either 100µs DRAM-safe pulse or 200ms full-system reset - no external timers required |
| Power-supply glitch immunity | 13µs comparator response + 0.1µF per-rail bypassing prevents spurious resets from transient noise |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Monitoring 2.5V core, 3.3V I/O, and adjustable VCORE rails during cold boot and dynamic voltage scaling. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized power-on reset and brownout protection with 200ms delay. Use Value: Prevents CPU lockup by ensuring all rails stabilize before releasing reset, leveraging ±0.75% threshold accuracy for tight margin compliance. | Use Scenario: Supervising 2.5V memory, 3.3V peripheral, and adjustable battery-charger rails in compact form factor. IC Role / Device Role / Timing Role: Micropower supervisor enabling long standby time while guaranteeing valid reset down to VCC25 ≥ 1V. Use Value: 20µA quiescent current extends battery runtime; MSOP-8 footprint saves PCB area versus discrete solutions. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Validating isolated 2.5V sensor interface, 3.3V MCU, and adjustable analog front-end supplies in field-deployed meters. IC Role / Device Role / Timing Role: Precision triple monitor with VCCA used as logic-level input for external fault signaling. Use Value: 1.000V VCCA threshold enables direct connection to comparator outputs or optocoupler collectors without level-shifting. | Use Scenario: Ensuring robust power sequencing in handheld medical devices powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Supervisor asserting RST until VCC25 ≥ 1V and VCC3 ≥ 1V, supporting partial rail operation during low-battery states. Use Value: Guaranteed reset assertion below 1V allows safe shutdown before brownout-induced data corruption occurs. |
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 beyond power monitoring is needed | Select LTC1726-2.5 only if watchdog functionality is mandatory; otherwise LTC1326CMS8-2.5#TRPBF offers lower power and simpler implementation |
| LTC2903-2.5 | Fixed 2.5V/3.3V/ADJ thresholds but in 6-lead SOT-23; no PBR input or SRST output | Suitable for space-constrained designs where push-button reset is not required | Choose LTC2903-2.5 for minimal footprint and cost-sensitive applications lacking manual reset needs |
Compared with LTC1726-2.5 and LTC2903-2.5, the LTC1326CMS8-2.5#TRPBF uniquely combines micropower operation (20µA), integrated soft/hard reset via PBR, and ±0.75% accuracy in an industry-standard MSOP-8 package - making it optimal for portable and industrial systems demanding both precision and user-initiated reset control.
Availability
LTC1326CMS8-2.5#TRPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and portable battery-powered equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1326CMS8-2.5#TRPBF 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, manufacturing, and documentation for legacy Linear parts including the LTC series.
The LTC1326 family was designed specifically for high-accuracy, low-power supervision of multi-rail systems in portable and industrial electronics - emphasizing threshold stability, glitch immunity, and flexible reset generation without external components.
FAQ
What is the function of the VCCA pin on the LTC1326CMS8-2.5#TRPBF?
The VCCA pin on the LTC1326CMS8-2.5#TRPBF is a high-impedance comparator input with a precise 1.000V threshold (±0.75%). It can monitor an adjustable supply rail or serve as a logic-level input-for example, interfacing directly with comparator outputs or optocoupler collectors. If unused, it may be tied to VCC3 or VCC25 without affecting operation.
Does the LTC1326CMS8-2.5#TRPBF support operation with only two supply rails?
Yes, the LTC1326CMS8-2.5#TRPBF supports dual-supply monitoring. The VCC25 pin can be tied to VCC3 to disable 2.5V supervision, and VCCA can be tied to VCC3 to disable the adjustable rail monitor-leaving only VCC3 active. This configuration retains full reset functionality with 200ms delay and PBR-driven soft/hard reset capability.
How does the PBR pin differentiate between soft and hard reset on the LTC1326CMS8-2.5#TRPBF?
The LTC1326CMS8-2.5#TRPBF uses internal timing to distinguish PBR press duration: a press shorter than ≈2 seconds generates a 100µs soft reset pulse on SRST, preserving DRAM refresh; a press longer than ≈2 seconds forces RST low for 200ms after release-equivalent to a power-on reset. Debounce logic delays SRST assertion by 20–35ms to reject contact bounce.
What is the minimum operating voltage for guaranteed reset assertion on the LTC1326CMS8-2.5#TRPBF?
The LTC1326CMS8-2.5#TRPBF guarantees correct RST logic state (low) for VCC3 ≥ 1V or VCC25 ≥ 1V. This ensures reliable reset assertion even during deep brownout conditions-critical for preventing undefined MCU behavior in battery-powered systems approaching end-of-life voltage.
Can the RST and SRST outputs of the LTC1326CMS8-2.5#TRPBF be safely OR-tied with other open-drain reset sources?
Yes, both RST and SRST outputs on the LTC1326CMS8-2.5#TRPBF are open-drain and explicitly designed for OR-tying with other reset sources. Their weak internal 6µA pull-ups to VCC3 allow external pull-up resistors to be added for faster rise times or higher voltage logic interfacing (e.g., pulling RST to 5V while powered from 3.3V).
LTC1326CMS8-2.5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-MSOP
LTC1326CMS8-2.5#TRPBF FAQ
1.How can I place an order for LTC1326CMS8-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326CMS8-2.5#TRPBF 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 LTC1326CMS8-2.5#TRPBF reliable?
The price and inventory of LTC1326CMS8-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326CMS8-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1326CMS8-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326CMS8-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326CMS8-2.5#TRPBF?
LTC1326CMS8-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326CMS8-2.5#TRPBF 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 LTC1326CMS8-2.5#TRPBF?
For technical support, including LTC1326CMS8-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326CMS8-2.5#TRPBF requirements.
6.How does Aetrix verify that LTC1326CMS8-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1326CMS8-2.5#TRPBF 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 LTC1326CMS8-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1326CMS8-2.5#TRPBF?
All LTC1326CMS8-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326CMS8-2.5#TRPBF, 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 LTC1326CMS8-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1326CMS8-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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