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Analog Devices Inc. LTC2918CMS-A1#PBF
- Part No.:
- LTC2918CMS-A1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918CMS-A1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:215
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Product details
Overview
LTC2918CMS-A1#PBF from Analog Devices (formerly Linear Technology) is a low-voltage supervisor IC with 9 selectable supply thresholds, fixed –5% tolerance, manual reset input (MR), and adjustable watchdog timer. It operates from 1.5V to 5.5V, consumes 30μA typical quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 85°C, and delivers 200ms internal reset timeout - used in automotive control systems for reliable power-on reset and microcontroller supervision.
For engineers reviewing the LTC2918CMS-A1#PBF datasheet, LTC2918CMS-A1#PBF pinout, LTC2918CMS-A1#PBF application, or LTC2918CMS-A1#PBF equivalent, key selection criteria include its MSOP-10 package, MR pin support for push-button interface, windowed watchdog capability (A1 version does not support windowed mode - only B1), internal 6.2V shunt regulator for high-voltage operation, and guaranteed RST assertion down to VCC ≥ 0.8V.
Technical Context
The LTC2918CMS-A1#PBF implements a dual-timer architecture: an internal 200ms reset timeout (RT = VCC) and an internal 1.6s watchdog upper boundary (WT = VCC), both configurable via external capacitors. Its VM comparator uses a precision bandgap reference and glitch-filtered input stage to ensure immunity to sub-150μs transients at up to 5% threshold deviation.
Three-state SEL1/SEL2 inputs select one of nine nominal thresholds (12V to ADJ=0.5V); MR is internally pulled up with 100kΩ, enabling direct push-button connection; and the open-drain RST output supports wired-OR configurations across multiple supervisors. The A1 suffix denotes commercial temperature grade (0°C to 70°C) and non-windowed watchdog behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to logic rails without external regulation; shunt regulator enables operation up to 12V with series resistor. |
| Threshold Accuracy | ±1.5% over full temp range - ensures reliable trip point margining against supply tolerances (e.g., 5V ±10% requires ≥11.5% headroom). |
| Quiescent Current | 30μA typical - enables use in battery-backed or always-on monitoring circuits without significant power penalty. |
| Reset Timeout | 200ms (internal, RT = VCC) - provides sufficient hold time for microcontroller initialization and clock stabilization. |
| Watchdog Upper Boundary | 1.6s (internal, WT = VCC) - sets maximum allowable software execution interval before system reset. |
| RST Output Type | Open-drain - allows level-shifting, wired-OR with other supervisors, and pull-up to any logic rail ≤7.5V. |
| MR Input Logic | Active-low with internal 100kΩ pull-up - eliminates need for external components in push-button reset implementation. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), RoHS-compliant, lead-free finish (#PBF). Thermal resistance θJA = 200°C/W. Exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and RST sink current; must be low-impedance connection. |
| MR | Manual reset input | Active-low input with internal 100kΩ pull-up to VCC - directly interfaces to momentary switch tied to GND. |
| SEL2 | Threshold select (LSB) | Three-state input (VCC/GND/open) that, with SEL1, selects one of nine nominal VM thresholds per Table 1. |
| SEL1 | Threshold select (MSB) | Three-state input (VCC/GND/open) - jointly configures VM trip point; leakage < ±5μA when open. |
| VM | Monitor voltage input | High-impedance comparator input (0.5–15V range); threshold set by SEL1/SEL2 and fixed –5% tolerance. |
| RST | Reset output | Open-drain output asserted low during undervoltage or watchdog timeout; requires external pull-up resistor. |
| RT | Reset timeout control | Capacitor-connected pin sets tRST = 9ms/nF; tied to VCC for 200ms, open for ~400μs, or grounded to disable. |
| WT | Watchdog timeout control | Capacitor-connected pin sets tWDU = 72ms/nF; tied to VCC for 1.6s, open for ~3.2ms, or grounded to disable. |
| WDI | Watchdog input | Edge-triggered input (VIH = 1.1V, VIL = 0.4V); falling edges monitored for timeout; pulse width ≥400ns required. |
| VCC | Power supply input | Operates as direct supply (≤5.5V) or shunt-regulated input (≥5.7V); internal 6.2V clamp limits max pin voltage. |
Key Features
| Feature | Design Value |
|---|---|
| 9 Selectable Thresholds | Internally programmed 12V/5V/3.3V/2.5V/1.8V/1.5V/1.2V/1V/ADJ(0.5V) - eliminates external resistor networks and reduces BOM count. |
| Fixed –5% Tolerance | Guaranteed trip point at nominal × 0.95 - simplifies design for standard supply rails without tolerance-select logic. |
| Manual Reset (MR) | Integrated 100kΩ pull-up enables single-component push-button interface - reduces layout complexity and component count. |
| Glitch Immunity | 150μs minimum pulse width required at VM to trigger RST - prevents false resets from load transients or noise near threshold. |
| Shunt Regulator | 6.2V internal clamp on VCC - allows direct 12V automotive supply connection with only a series current-limiting resistor. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply during cold-crank (battery dip to 6V) and hot-idle conditions. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST until VCC ≥ 0.8V and VM ≥ 4.75V (5V × 0.95), then holding reset for 200ms. Use Value: Ensures deterministic MCU boot after power recovery; MR pin enables service-mode reset without firmware intervention. |
Use Scenario: Supervises 3.3V FPGA configuration rail in modular I/O backplane with field-replaceable cards. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V rail and asserts RST to halt FPGA operation before configuration corruption occurs. Use Value: Prevents partial reconfiguration errors; open-drain RST supports shared reset bus across multiple modules. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Validates 1.8V DSP core supply during battery-to-AC switchover in portable infusion pumps. IC Role / Device Role / Timing Role: Monitors 1.8V rail with ADJ mode (external divider) and triggers RST if voltage drops below 1.71V for >200ms. Use Value: Guarantees safe shutdown before brownout-induced data loss; ±1.5% accuracy ensures margin against 1.8V ±5% spec. |
Use Scenario: Supervises 12V intermediate bus feeding multiple DC/DC converters in 48V telecom rectifier systems. IC Role / Device Role / Timing Role: Uses internal shunt regulator to operate directly from 12V input; asserts RST if VM falls below 11.4V (12V × 0.95). Use Value: Eliminates dedicated LDO for supervisor bias; 125°C-rated variants available for chassis-mount high-temp zones. |
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 manual reset, 140ms reset timeout, SOT23-3 package | Lacks selectable thresholds and MR; suited only for single-rail monitoring with minimal footprint | Select when only 2.93V supervision is needed and board space is constrained; not suitable for multi-rail or push-button reset designs. |
| TPS3808G18DBVR | Fixed 1.8V threshold, adjustable reset delay (0.5ms–10s), no watchdog, SOT23-6 package | Offers wider reset timing range but no watchdog or manual reset; requires external capacitor for delay | Choose for cost-sensitive 1.8V-only applications needing long reset delays; lacks LTC2918CMS-A1#PBF's integrated watchdog and MR functionality. |
Compared with MAX6326US29D3+T and TPS3808G18DBVR, the LTC2918CMS-A1#PBF provides unique value through its 9-threshold flexibility, built-in MR interface, and dual-timer watchdog - making it optimal for complex embedded systems requiring robust, multi-rail supervision with field-serviceability.
Availability
LTC2918CMS-A1#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and telecom base station power management requiring stable component supply and long-term lifecycle assurance.
Supply support for LTC2918CMS-A1#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2918 belongs to ADI's precision power monitoring product line, designed specifically for mission-critical embedded systems where deterministic reset behavior, wide supply range, and high-temperature reliability are essential.
FAQ
What is the operating temperature range for the LTC2918CMS-A1#PBF?
The LTC2918CMS-A1#PBF is specified for 0°C to 70°C ambient operation (Commercial grade). This distinguishes it from the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants. The "A1" suffix explicitly denotes this commercial temperature range, and all electrical specifications in the datasheet apply within this range unless otherwise noted.
Does the LTC2918CMS-A1#PBF support windowed watchdog functionality?
No, the LTC2918CMS-A1#PBF does not support windowed watchdog operation. Windowed watchdog (requiring both upper and lower timing boundaries) is exclusive to B1 versions (e.g., LTC2918CMS-B1#PBF). The A1 version implements only a standard single-boundary watchdog timer - RST asserts if WDI edges are missed beyond the upper timeout (e.g., 1.6s when WT = VCC), with no lower-bound enforcement.
How is the reset timeout configured on the LTC2918CMS-A1#PBF?
The LTC2918CMS-A1#PBF offers three reset timeout configurations: (1) RT tied to VCC yields ~200ms internal timeout; (2) RT left open yields ~400μs; (3) RT connected to GND via capacitor CRT sets tRST = 9ms/nF (e.g., 2.2nF → 20ms). No external resistor is required - only capacitor selection determines adjustable timing.
Can the LTC2918CMS-A1#PBF monitor a 12V supply directly?
Yes, the LTC2918CMS-A1#PBF can monitor a 12V supply directly using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) must be placed between the 12V source and VCC to limit input current to ≤5mA. VM then monitors the 12V rail with threshold set to 12V × 0.95 = 11.4V via SEL1=VCC, SEL2=VCC.
What is the function of the MR pin on the LTC2918CMS-A1#PBF?
The MR (Manual Reset) pin on the LTC2918CMS-A1#PBF is an active-low input with an internal 100kΩ pull-up to VCC. Driving MR low forces RST assertion for one full reset timeout period (e.g., 200ms if RT = VCC), then releases RST. This enables hardware-initiated system reset via push-button without external pull-up components - a feature absent in the LTC2917 family.
LTC2918CMS-A1#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
LTC2918CMS-A1#PBF FAQ
1.How can I place an order for LTC2918CMS-A1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CMS-A1#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 LTC2918CMS-A1#PBF reliable?
The price and inventory of LTC2918CMS-A1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2918CMS-A1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2918CMS-A1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CMS-A1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CMS-A1#PBF?
LTC2918CMS-A1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CMS-A1#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 LTC2918CMS-A1#PBF?
For technical support, including LTC2918CMS-A1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CMS-A1#PBF requirements.
6.How does Aetrix verify that LTC2918CMS-A1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CMS-A1#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 LTC2918CMS-A1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2918CMS-A1#PBF?
All LTC2918CMS-A1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CMS-A1#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 LTC2918CMS-A1#PBF part is unused and in its original packaging.
Return procedure for LTC2918CMS-A1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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