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Analog Devices Inc. LTC2935CDC-2#TRMPBF
- Part No.:
- LTC2935CDC-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935CDC-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2935CDC-2#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up reset and power-fail outputs, eight pin-selectable reset thresholds (2.25V–3.30V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered portable equipment requiring reliable early-warning shutdown and system initialization.
For engineers reviewing the LTC2935CDC-2#TRMPBF datasheet, LTC2935CDC-2#TRMPBF pinout, LTC2935CDC-2#TRMPBF application, or LTC2935CDC-2#TRMPBF equivalent, key selection criteria include its active-pull-up RST/PFO outputs (eliminating external pull-ups), 200ms reset timeout with 5% hysteresis, –40°C to 85°C industrial temperature range, and DFN (2mm × 2mm) package compatibility with space-constrained designs.
Technical Context
The LTC2935CDC-2#TRMPBF integrates dual comparators with precision internal attenuators to monitor VCC against independently configured reset and power-fail thresholds. Its S2/S1/S0 inputs select one of eight fixed falling-reset thresholds (e.g., 3.30V, 3.15V, 3.00V…2.25V), each paired with a fixed +150mV power-fail threshold (e.g., 3.45V, 3.30V…2.40V).
It features an internal 200ms reset timeout timer activated on VCC rise above threshold +5% hysteresis, manual reset input (MR) with 200ms debounced release, and active-pull-up RST/PFO outputs referenced to VCC - enabling direct interfacing with CMOS logic without external resistors while supporting operation down to VCC = 0V with optional ground tie.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables multi-year battery life in coin-cell or alkaline-powered systems. |
| Reset Threshold Range | 2.25V to 3.30V (8 pin-selectable values) - covers common microcontroller I/O rails (1.8V, 2.5V, 3.3V) and battery discharge profiles. |
| Power-Fail Threshold Offset | +150mV above selected reset threshold - provides deterministic early warning margin before system reset. |
| Threshold Accuracy | ±1.5% max over –40°C to 85°C - ensures robust reset timing across industrial temperature extremes. |
| Reset Timeout | 200ms nominal with ±30ms variation - guarantees sufficient processor initialization time after power stabilization. |
| Output Type | Active pull-up (LTC2935-2 variant) - eliminates need for external pull-up resistors; outputs drive high to VCC. |
| Operating Temperature | –40°C to 85°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad (optional GND connection), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply and monitored voltage input | Primary rail under supervision; requires 0.1μF decoupling to GND; powers internal circuitry and defines output high level. |
| MR | Manual reset input | Active-low pushbutton interface; internally pulled up to VCC (900kΩ); forces RST low for ≥200ms after release. |
| RST | Reset output | Active-pull-up output; drives high to VCC when valid; pulls low during undervoltage or MR assertion; 200ms timeout on recovery. |
| PFO | Power-fail output | Active-pull-up output; asserts low when VCC falls below power-fail threshold (reset threshold +150mV); releases at threshold +2.5% hysteresis. |
| S2, S1, S0 | Threshold selection inputs | Binary-coded inputs (GND = Low, VCC = High) selecting one of eight reset/power-fail threshold pairs per Table 1. |
| GND | Ground reference | System ground return for all internal comparators, timers, and output drivers; exposed pad may be connected here. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 500nA typical - minimizes battery drain in always-on monitoring applications like security sensors or IoT endpoints. |
| Configurable dual-threshold supervision | Eight discrete reset thresholds with fixed +150mV power-fail offset - enables precise staging of warning and shutdown actions. |
| Active-pull-up outputs | No external pull-up resistors required - simplifies BOM, reduces board area, and avoids resistor-induced leakage or noise coupling. |
| Guaranteed reset timeout | 200ms minimum assertion time - ensures reliable microcontroller boot sequence completion after power recovery. |
| Industrial temperature grade | –40°C to 85°C operation - supports deployment in automotive cabins, industrial controllers, and outdoor electronics. |
Applications
| Portable Medical Sensors | Battery-Powered Point-of-Sale Terminals |
|---|---|
|
Use Scenario: Coin-cell–powered glucose meter with Bluetooth LE transmission requiring low-power wake-up and controlled shutdown before battery depletion. IC Role / Device Role / Timing Role: LTC2935CDC-2#TRMPBF monitors CR2032 voltage (nominal 3.0V), asserts PFO at 2.70V for NMI-triggered data save, then asserts RST at 2.55V to halt MCU. Use Value: 500nA quiescent current extends shelf life; active-pull-up outputs interface directly with BLE SoC GPIOs; 200ms reset timeout prevents brownout lockup. |
Use Scenario: Handheld POS terminal using dual alkaline AA cells (3.0V nominal) with LCD backlight and thermal printer. IC Role / Device Role / Timing Role: LTC2935CDC-2#TRMPBF supervises main 3.0V rail, triggers PFO at 3.15V to disable backlight and initiate flash memory write, then resets MCU at 3.00V. Use Value: Pin-selectable thresholds match alkaline discharge curve; ±1.5% accuracy ensures consistent shutdown across temperature; DFN package fits compact PCB layout. |
| Wireless Security Sensors | Industrial Data Loggers |
|
Use Scenario: Zigbee-enabled door/window sensor powered by lithium thionyl chloride (3.6V) with 10-year battery life target. IC Role / Device Role / Timing Role: LTC2935CDC-2#TRMPBF monitors VCC, asserts PFO at 3.45V to trigger low-battery alert via RF, then asserts RST at 3.30V to enter deep sleep. Use Value: 500nA ICC preserves battery capacity; active-pull-up PFO drives RF transceiver enable line directly; no external components reduce failure modes. |
Use Scenario: Ruggedized environmental logger using LiFePO₄ battery (3.2V nominal) deployed in remote field locations. IC Role / Device Role / Timing Role: LTC2935CDC-2#TRMPBF supervises 3.2V system rail, uses S2/S1/S0 to set reset at 2.85V and PFO at 3.00V, coordinating SD card flush and RTC backup before shutdown. Use Value: –40°C to 85°C rating ensures reliability in uncontrolled enclosures; 200ms reset timeout accommodates slow LDO recovery; DFN package withstands vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-2#TRMPBF | Same functionality and specs, but in 8-lead TSOT-23 package (2.9mm × 1.6mm) instead of DFN (2mm × 2mm). | Preferred where board height is constrained (<0.9mm profile) or existing TSOT-23 footprint is used. | Select when footprint compatibility or lower profile outweighs DFN's superior thermal performance (θJA = 102°C/W vs 195°C/W). |
| LTC2934CDC-2#TRMPBF | Adjustable thresholds via external resistors (not pin-selectable); same 500nA ICC, active-pull-up outputs, and 200ms timeout. | Used when fine-grained threshold tuning (e.g., 2.92V) is required beyond the eight fixed LTC2935 steps. | Choose when design flexibility justifies added resistor count and layout complexity; not drop-in compatible due to different pinout and bias network. |
Compared with LTC2935ITS8-2#TRMPBF, the LTC2935CDC-2#TRMPBF offers better thermal dissipation and smaller footprint area; compared with LTC2934CDC-2#TRMPBF, it delivers faster, more deterministic threshold configuration without external components - critical for high-volume production consistency.
Availability
LTC2935CDC-2#TRMPBF is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered point-of-sale terminals, and wireless security sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2935CDC-2#TRMPBF 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 its precision analog and power management product lines with full technical documentation and long-term manufacturing commitment.
The LTC2935 family was designed specifically for ultra-low-power battery supervision in portable and energy-harvesting systems, emphasizing sub-μA quiescent current, pin-configurable thresholds, and robust industrial-grade reliability.
FAQ
What is the operating temperature range for the LTC2935CDC-2#TRMPBF?
The LTC2935CDC-2#TRMPBF is rated for operation from –40°C to 85°C, meeting industrial temperature requirements. This range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, and applies across all specified electrical parameters including threshold accuracy and reset timeout.
Does the LTC2935CDC-2#TRMPBF require external pull-up resistors on RST and PFO?
No, the LTC2935CDC-2#TRMPBF uses active-pull-up outputs - meaning internal circuitry drives RST and PFO high to VCC without external components. This eliminates pull-up resistors, reduces BOM cost, and avoids associated leakage or noise issues. External pull-down resistors (e.g., 100kΩ to GND) are optional for leakage control when interfacing with high-impedance inputs.
How does the power-fail threshold relate to the reset threshold in the LTC2935CDC-2#TRMPBF?
In the LTC2935CDC-2#TRMPBF (LTC2935-2 variant), the power-fail threshold is fixed at exactly 150mV above the selected reset threshold - for example, if S2/S1/S0 configure a 3.00V reset threshold, PFO asserts at 3.15V. This differential is guaranteed and independent of temperature or supply voltage, providing deterministic early warning timing.
Can the LTC2935CDC-2#TRMPBF operate with VCC down to 0V?
Yes - the LTC2935CDC-2#TRMPBF's active-pull-up outputs remain functional even as VCC approaches 0V, provided an external pull-down resistor (e.g., 100kΩ) is connected from RST or PFO to GND. This prevents floating states when VCC is absent, ensuring defined logic levels for downstream CMOS inputs during full power loss.
What is the reset timeout duration of the LTC2935CDC-2#TRMPBF and how is it triggered?
The LTC2935CDC-2#TRMPBF has a nominal 200ms reset timeout period. It is triggered automatically when VCC rises above the selected reset threshold plus 5% hysteresis; RST remains low for the full timeout duration before returning high, ensuring stable power conditions before system initialization proceeds.
LTC2935CDC-2#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 8 Selectable Threshold Combinations
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LTC2935CDC-2#TRMPBF FAQ
1.How can I place an order for LTC2935CDC-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935CDC-2#TRMPBF 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 LTC2935CDC-2#TRMPBF reliable?
The price and inventory of LTC2935CDC-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935CDC-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2935CDC-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935CDC-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935CDC-2#TRMPBF?
LTC2935CDC-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935CDC-2#TRMPBF 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 LTC2935CDC-2#TRMPBF?
For technical support, including LTC2935CDC-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935CDC-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2935CDC-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2935CDC-2#TRMPBF 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 LTC2935CDC-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2935CDC-2#TRMPBF?
All LTC2935CDC-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935CDC-2#TRMPBF, 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 LTC2935CDC-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2935CDC-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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