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Analog Devices Inc. LTC2917CMS-B1#PBF
- Part No.:
- LTC2917CMS-B1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2917CMS-B1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,912
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Product details
Overview
LTC2917CMS-B1#PBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 27 selectable reset thresholds, windowed watchdog timer, and manual reset capability disabled - designed for reliable power-on reset and fault detection in automotive and industrial systems. It operates from 1.5V to 5.5V supply, consumes only 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 125°C, and supports 125°C operation for under-hood automotive applications.
For engineers reviewing the LTC2917CMS-B1#PBF datasheet, LTC2917CMS-B1#PBF pinout, LTC2917CMS-B1#PBF application, or LTC2917CMS-B1#PBF equivalent, key selection considerations include its B1 variant's windowed watchdog (tWDL = 50ms, tWDU = 1.6s), MSOP-10 package compatibility, tolerance-selectable thresholds (–5%/–10%/–15%), and guaranteed RST assertion down to VCC ≥ 0.8V.
Technical Context
The LTC2917CMS-B1#PBF implements a dual-stage supervision architecture: a high-accuracy comparator monitors VM against one of nine nominal voltages (12V to 0.5V ADJ) selected via SEL1/SEL2, with tolerance set by TOL (–5%, –10%, or –15%). Its internal 200ms fixed reset timeout and adjustable watchdog timer use internal references referenced to VCC, enabling glitch-immune operation without external components.
As a B1 version, it features windowed watchdog functionality requiring falling edges on WDI within both lower (50ms) and upper (1.6s) boundaries - preventing false resets from stuck or oscillating signals. The device integrates a 6.2V shunt regulator on VCC, allowing direct operation from supplies up to 12V when paired with an external series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to logic rails; shunt regulation enables 12V operation with series resistor |
| Threshold Accuracy | ±1.5% over –40°C to 125°C - ensures reliable trip point across automotive temperature extremes |
| Quiescent Current | 30μA typical - enables long-battery-life monitoring in always-on subsystems |
| Reset Timeout | 200ms (RT tied to VCC) - provides sufficient hold time for microcontroller initialization |
| Watchdog Window | tWDL = 50ms / tWDU = 1.6s (B1 version) - enforces valid software execution timing with anti-stuck protection |
| VM Input Impedance | 0.5–8MΩ - minimizes loading on monitored supply, critical for high-impedance sources |
| VCC Undervoltage Lockout | 1.5V max - guarantees functional reset behavior during brown-out conditions |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, rated for operation up to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuits and RST output sink |
| TOL | Tolerance select input (three-state) | Sets monitored voltage tolerance: VCC = –5%, open = –10%, GND = –15% |
| SEL2 | Nominal threshold select input (three-state) | Combines with SEL1 to configure one of nine VM trip points (e.g., 1.8V, 3.3V, ADJ) |
| SEL1 | Nominal threshold select input (three-state) | MSOP pin 4; used with SEL2 per Table 1 to define VM threshold without external resistors |
| VM | Monitored voltage input | High-impedance comparator input; trip point determined by SEL1/SEL2/TOL configuration |
| RST | Open-drain reset output | Asserts low during undervoltage or watchdog fault; requires external pull-up to logic rail |
| RT | Reset timeout control | Tie to VCC for 200ms timeout; leave open for ~400μs; add capacitor for adjustable delay |
| WT | Watchdog timeout control | Tie to VCC for 1.6s windowed timeout (B1); tie to GND to disable watchdog |
| WDI | Watchdog input | Falling-edge-triggered only in B1 versions; must toggle within 50ms–1.6s window to avoid reset |
| VCC | Power supply input | Accepts 1.5–5.5V directly; includes integrated 6.2V shunt regulator for >5.7V operation |
Key Features
| Feature | Design Value |
|---|---|
| 27 Selectable Thresholds | 9 nominal voltages × 3 tolerances (–5%/–10%/–15%) - eliminates need for external resistor dividers in most designs |
| Windowed Watchdog (B1) | Enforces both minimum and maximum WDI edge intervals (50ms–1.6s) - prevents lockup from frozen or noisy firmware |
| Guaranteed Operation to 125°C | Qualified for automotive under-hood environments - no derating required at full temperature range |
| Glitch Immunity | Combined 10μs–150μs input filtering + 200ms reset timeout - rejects transients while maintaining fast response |
| 6.2V Internal Shunt Regulator | Enables direct 12V battery monitoring with single series resistor - simplifies high-voltage power domain interface |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply in engine bay where ambient temperature reaches 125°C and supply may dip during cranking. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST during undervoltage and enforcing windowed watchdog on main MCU's heartbeat signal. Use Value: Prevents erratic MCU behavior during cold-crank brownouts and detects firmware hangs caused by EMI-induced code lockup. |
Use Scenario: Supervising 3.3V FPGA configuration rail in factory-floor programmable logic controller with strict uptime requirements. IC Role / Device Role / Timing Role: Reset generator with adjustable 200ms timeout and windowed watchdog ensuring FPGA reconfiguration completes before watchdog expires. Use Value: Guarantees deterministic recovery after power interruption and eliminates silent failures from corrupted bitstreams. |
| Telecom Base Station Power Shelf | Medical Infusion Pump Controller |
Use Scenario: Monitoring 12V backplane supply feeding multiple DC/DC converters in outdoor 5G radio equipment. IC Role / Device Role / Timing Role: High-voltage supervisor using internal shunt regulator and ADJ mode to monitor 12V with –10% tolerance. Use Value: Enables single-chip 12V supervision without external regulators, reducing BOM count and improving thermal reliability. |
Use Scenario: Ensuring safe startup and runtime integrity of ARM-based pump controller operating from Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 1.8V core rail and provides windowed watchdog on safety-critical motor control loop. Use Value: Meets IEC 62304 Class C software safety requirements by detecting both power faults and algorithmic failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Fixed 2.93V threshold, no tolerance selection, no windowed watchdog, SOT23-3 package | Limited to single-rail monitoring; lacks multi-threshold flexibility and advanced watchdog | Select when cost-sensitive, single-supply designs require minimal footprint and basic reset only |
| TPS3808G33DBVR | Fixed 3.3V threshold, adjustable reset timeout (1–10s), no windowed watchdog, no shunt regulator | Requires external resistor divider for non-3.3V rails; unsuitable for >5.5V direct operation | Prefer for low-power, wide-timing-range applications where voltage flexibility is not required |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2917CMS-B1#PBF delivers unique value through its 27-threshold configurability, integrated 6.2V shunt regulator, and B1-specific windowed watchdog - making it the only option among the three qualified for AEC-Q100 Grade 1 automotive operation with full 125°C support.
Availability
LTC2917CMS-B1#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, telecom power shelves, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2917CMS-B1#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2917 family was designed specifically for automotive and industrial systems demanding guaranteed operation to 125°C, precise voltage monitoring, and robust watchdog supervision - with the B1 variant optimized for high-reliability applications requiring windowed timing enforcement.
FAQ
What is the function of the TOL pin on the LTC2917CMS-B1#PBF?
The TOL pin on the LTC2917CMS-B1#PBF selects the tolerance band applied to the monitored voltage: VCC = –5%, open = –10%, GND = –15%. This allows precise alignment of the reset threshold relative to the power supply's specified tolerance, preventing nuisance resets. Unlike the LTC2918, the LTC2917CMS-B1#PBF includes this pin, enabling full 27-threshold configuration (9 voltages × 3 tolerances).
Does the LTC2917CMS-B1#PBF support operation from a 12V supply?
Yes, the LTC2917CMS-B1#PBF supports 12V operation via its integrated 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) must be used to keep VCC pin current ≤5mA. This eliminates the need for an external LDO or buck converter, simplifying high-voltage monitoring in automotive and industrial applications.
How does the windowed watchdog feature work in the LTC2917CMS-B1#PBF?
The LTC2917CMS-B1#PBF implements a windowed watchdog requiring falling edges on WDI to occur strictly between tWDL = 50ms and tWDU = 1.6s. Edges outside this window - too fast (stuck high) or too slow (frozen) - trigger RST. This prevents false resets from noise while detecting firmware lockups that standard watchdogs miss, a key reliability enhancement for safety-critical systems.
What is the minimum VCC voltage required for the LTC2917CMS-B1#PBF to assert a valid RST output?
The LTC2917CMS-B1#PBF guarantees RST assertion for VCC ≥ 0.8V, ensuring reliable power-on reset even during severe brownout conditions. Below 1.5V, the device remains in undervoltage lockout - holding RST low regardless of VM state - and only begins accurate threshold monitoring once VCC exceeds the UVLO threshold.
Can the LTC2917CMS-B1#PBF monitor an adjustable voltage like 0.5V?
Yes, the LTC2917CMS-B1#PBF supports ADJ mode (SEL1 = GND, SEL2 = GND) to monitor voltages as low as 0.5V. In this mode, VM connects directly to the comparator input with high impedance (≥0.5MΩ), allowing use of an external resistive divider to set any desired trip point - ideal for custom low-voltage rails or battery monitoring applications.
LTC2917CMS-B1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 27 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2917CMS-B1#PBF FAQ
1.How can I place an order for LTC2917CMS-B1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2917CMS-B1#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 LTC2917CMS-B1#PBF reliable?
The price and inventory of LTC2917CMS-B1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2917CMS-B1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2917CMS-B1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2917CMS-B1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2917CMS-B1#PBF?
LTC2917CMS-B1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2917CMS-B1#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 LTC2917CMS-B1#PBF?
For technical support, including LTC2917CMS-B1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2917CMS-B1#PBF requirements.
6.How does Aetrix verify that LTC2917CMS-B1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2917CMS-B1#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 LTC2917CMS-B1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2917CMS-B1#PBF?
All LTC2917CMS-B1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2917CMS-B1#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 LTC2917CMS-B1#PBF part is unused and in its original packaging.
Return procedure for LTC2917CMS-B1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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