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Analog Devices Inc. LTC2935CDC-3
- Part No.:
- LTC2935CDC-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935CDC-3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,411
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Product details
Overview
LTC2935CDC-3 from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with open-drain reset and power-fail outputs, designed for battery-powered systems requiring precise, configurable threshold monitoring. It features 500nA typical quiescent current, ±1.5% max threshold accuracy over temperature, eight pin-selectable reset thresholds (1.60V–2.40V), and a fixed 120mV power-fail margin above each selected reset threshold. It operates in the 0°C to 70°C industrial range and is housed in an 8-lead 2mm × 2mm DFN package.
For engineers reviewing the LTC2935CDC-3 datasheet, LTC2935CDC-3 pinout, LTC2935CDC-3 application, or LTC2935CDC-3 equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in coin-cell and alkaline stack monitoring, and validated alternative options - all grounded in the official LTC2935 datasheet (Rev. FA) and Analog Devices product documentation.
Technical Context
The LTC2935CDC-3 implements dual independent comparators: one for reset generation (RST) and one for early warning (PFO), both referenced to precision internal voltage references and attenuators. Its threshold selection logic uses S2/S1/S0 inputs to configure one of eight discrete falling-reset thresholds, with hysteresis of 5% on RST and 2.5% on PFO.
As an open-drain variant (LTC2935-3 family), it supports external pull-up voltages up to 5.5V - independent of VCC - enabling level-shifting and mixed-voltage system interfacing. The 200ms internal reset timeout ensures stable processor initialization after supply recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables multi-year operation on coin cells without measurable drain. |
| Reset Threshold Range | 1.60V to 2.40V (8 pin-selectable values) - covers common low-voltage rails (1.8V, 2.5V, 3.3V logic domains). |
| Power-Fail Margin | +120mV above configured reset threshold - provides deterministic early-warning window before reset assertion. |
| Threshold Accuracy | ±1.5% max over –40°C to 85°C - ensures reliable trip points across temperature without calibration. |
| Reset Timeout | 200ms (140–260ms min/max) - guarantees sufficient system stabilization time before releasing RST high. |
| Operating Temp Range | 0°C to 70°C - qualified for commercial/industrial portable equipment environments. |
| VCC Supply Range | 1V to 5.5V - supports direct monitoring of Li-ion, alkaline, and coin-cell sources without external scaling. |
Pinout & Package
Package: 8-lead, 2mm × 2mm plastic DFN (DC package), exposed pad (optional GND connection), RoHS-compliant, lead-free finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply and monitored input | Primary voltage rail under supervision; powers internal circuitry and serves as reference for threshold detection. |
| MR | Manual reset input | Active-low pushbutton interface; internally pulled up to VCC (900kΩ); asserts RST for 200ms after release. |
| RST | Open-drain reset output | Drives low when VCC falls below selected threshold; requires external pull-up; compatible with 5.5V logic levels. |
| PFO | Open-drain power-fail output | Drives low when VCC falls below reset threshold + 120mV; signals impending brownout for controlled shutdown. |
| S2, S1, S0 | Binary threshold select inputs | Three logic inputs (GND/VCC) that set one of eight reset/power-fail threshold pairs per Falling Threshold Selection Table. |
| GND | Ground reference | System ground return for all internal comparators, references, and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 500nA typical - extends battery life in always-on sensors and wearables by orders of magnitude vs. μA-class supervisors. |
| Configurable dual thresholds | Eight discrete reset thresholds + corresponding PFO offsets - eliminates need for external resistive dividers or trimming. |
| Open-drain outputs | RST and PFO support independent pull-up voltages up to 5.5V - enables interfacing with higher-voltage logic or mixed-supply microcontrollers. |
| Integrated hysteresis | 5% on RST, 2.5% on PFO - prevents output chatter during slow-rising/falling supply transients without external RC networks. |
| Compact DFN package | 2mm × 2mm footprint with thermal pad - saves PCB area in space-constrained portable devices like medical patches and IoT nodes. |
Applications
| Alkaline Cell Stack Monitoring | Coin Cell Voltage Supervision |
|---|---|
Use Scenario: Monitoring 3×AA or 4×AAA alkaline stacks (4.5V–6.0V) powering handheld meters or remote sensors. IC Role / Device Role / Timing Role: LTC2935CDC-3 acts as primary voltage supervisor, asserting PFO at ~3.15V and RST at ~3.00V to trigger graceful shutdown before data corruption. Use Value: Prevents unexpected resets during load transients; 120mV PFO margin allows firmware to save state before final brownout. |
Use Scenario: Supervising CR2032 (3.0V nominal) or BR2032 (2.8V) batteries in Bluetooth beacons or smart tags. IC Role / Device Role / Timing Role: LTC2935CDC-3 monitors declining cell voltage, using S2/S1/S0 to select 2.55V reset and 2.70V PFO thresholds. Use Value: Enables accurate end-of-life detection with ±1.5% accuracy - avoids premature shutdown while preventing deep discharge damage. |
| Low-Power Microcontroller Reset | Portable Medical Device Power Management |
Use Scenario: Providing clean, glitch-immune reset to ARM Cortex-M0+ or RISC-V MCUs in battery-operated edge nodes. IC Role / Device Role / Timing Role: LTC2935CDC-3 generates a 200ms reset pulse upon power-up and brownout, synchronized to VCC stabilization. Use Value: Eliminates need for RC-based reset circuits; built-in hysteresis and 1ms glitch immunity ensure robust operation in noisy EMI environments. |
Use Scenario: Ensuring safe power sequencing and shutdown in wearable ECG monitors or glucose meters powered by single Li-SOCl₂ cells. IC Role / Device Role / Timing Role: LTC2935CDC-3 interfaces with analog front-end and MCU via open-drain PFO/RST, signaling low-battery condition to initiate data backup. Use Value: 500nA quiescent current preserves battery capacity during standby; DFN package fits tight form factors required for body-worn devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-3#TRPBF | Same functionality and pinout, but rated for –40°C to 85°C extended temperature range. | Required for automotive cabin modules or outdoor industrial sensors operating beyond 70°C. | Select when ambient operating temperature exceeds 70°C; otherwise, LTC2935CDC-3 offers cost and qualification advantages for commercial-grade designs. |
| LTC2934CTS8-3#TRPBF | Adjustable thresholds via external resistor divider (not pin-selectable); 400nA ICC; same DFN/TSOT-23 packages. | Better suited for non-standard thresholds (e.g., 2.17V) where fixed 120mV PFO offset is acceptable. | Choose LTC2934CTS8-3 only if custom threshold tuning is needed; LTC2935CDC-3 provides faster, more repeatable configuration without external components. |
Compared with LTC2935ITS8-3#TRPBF, LTC2935CDC-3 trades extended temperature capability for lower cost and commercial qualification; compared with LTC2934CTS8-3#TRPBF, it delivers deterministic, factory-trimmed thresholds without resistor tolerance drift or layout sensitivity.
Availability
LTC2935CDC-3 is available at Aetrix Electronics and suitable for battery-powered equipment, portable medical devices, and security systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC2935CDC-3 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 LTC2935 family was designed specifically for ultra-low-power, pin-configurable voltage supervision in portable and energy-harvesting systems - emphasizing minimal ICC, precision thresholds, and compact packaging.
FAQ
What is the exact reset threshold for LTC2935CDC-3 when S2=S1=S0=GND?
The LTC2935CDC-3 uses the LTC2935-3 threshold table. With S2=S1=S0=GND (all low), its reset threshold is 2.440V (typical), ranging from 2.404V to 2.476V across temperature and process variation. This value is factory-trimmed and guaranteed per the Electrical Characteristics table in the datasheet.
Does LTC2935CDC-3 support pull-up voltages higher than VCC?
Yes - LTC2935CDC-3 features open-drain RST and PFO outputs, allowing external pull-up voltages up to 5.5V regardless of VCC level. This enables interfacing with higher-voltage logic families (e.g., 5V MCU I/O) even when VCC is only 1.8V or 2.5V.
How does the manual reset (MR) function work on LTC2935CDC-3?
When MR is pulled low (e.g., via pushbutton to GND), LTC2935CDC-3 forces RST low immediately. After MR returns high, RST remains low for a guaranteed 200ms timeout before releasing high - ensuring consistent reset duration independent of button release timing or noise.
What is the power-fail threshold offset for LTC2935CDC-3?
LTC2935CDC-3 has a fixed +120mV power-fail threshold offset above its selected reset threshold. For example, with a 2.44V reset point, PFO asserts at 2.56V. This differential is guaranteed between 70mV and 170mV per datasheet limits, with 120mV typical.
Is the exposed pad on the LTC2935CDC-3 DFN package required to connect to GND?
No - the exposed pad on the LTC2935CDC-3 DFN package may be left floating or connected to GND per design requirements. It is not electrically tied to any internal node; connecting it to GND improves thermal performance but is optional for functional operation.
LTC2935CDC-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 8 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- 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-3 FAQ
1.How can I place an order for LTC2935CDC-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935CDC-3 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-3 reliable?
The price and inventory of LTC2935CDC-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935CDC-3 is usually 5 days.
3.What payment methods are accepted for LTC2935CDC-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935CDC-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935CDC-3?
LTC2935CDC-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935CDC-3 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-3?
For technical support, including LTC2935CDC-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935CDC-3 requirements.
6.How does Aetrix verify that LTC2935CDC-3 is sourced from the original manufacturer or authorized distributors?
All LTC2935CDC-3 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-3 meets industry standards.
7.What is the process for return or replacement of LTC2935CDC-3?
All LTC2935CDC-3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935CDC-3, 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-3 part is unused and in its original packaging.
Return procedure for LTC2935CDC-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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