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Analog Devices Inc. LTC2935CDC-1
- Part No.:
- LTC2935CDC-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935CDC-1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,766
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Product details
Overview
LTC2935CDC-1 from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with pin-selectable reset and power-fail thresholds, open-drain RST/PFO outputs, and 500nA typical quiescent current. It provides system initialization, early low-voltage warning, and reset generation for battery-powered systems monitoring VCC from 1.6V to 3.45V. Used in portable medical devices requiring stable brownout detection and controlled shutdown.
For engineers reviewing the LTC2935CDC-1 datasheet, LTC2935CDC-1 pinout, LTC2935CDC-1 application, or LTC2935CDC-1 equivalent, key selection criteria include its 8-pin DFN package, ±1.5% threshold accuracy over temperature, 200ms reset timeout, manual reset input (MR), and configurable dual-threshold supervision for battery voltage monitoring with early warning capability.
Technical Context
The LTC2935CDC-1 integrates two precision comparators: one for reset (RST) activation at a user-selected falling threshold (eight options via S2/S1/S0), and another for power-fail warning (PFO) at a fixed offset above that threshold (150mV for -1/-2 variants). Its internal 5% hysteresis on RST and 2.5% on PFO prevents chatter during supply transients.
It operates across 0°C to 70°C ambient, draws only 500nA typical ICC, and features a 200ms internal reset timer after VCC exceeds the threshold. The MR input supports manual reset with 20μs minimum pulse width and internal 900kΩ pull-up, enabling pushbutton-initiated system reset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables multi-year operation on coin cells without measurable battery drain. |
| Reset Threshold Accuracy | ±1.5% max over temperature - ensures reliable brownout detection across industrial ambient range. |
| Reset Timeout Period | 200ms nominal - guarantees sufficient processor initialization time before releasing reset signal. |
| Power-Fail Offset | +150mV above selected reset threshold - provides deterministic early warning margin before reset assertion. |
| Supply Voltage Range | 1.6V to 5.5V - supports direct monitoring of Li-ion, alkaline, and coin cell stacks without external scaling. |
| Hysteresis (RST) | 5% of threshold - suppresses false resets caused by load-induced supply droop or noise. |
| Manual Reset Pulse Width | 20μs min - allows compact pushbutton designs with minimal PCB footprint. |
Pinout & Package
Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad (optional GND connection), RoHS-compliant, 0°C to 70°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply & monitored voltage input | Primary power rail under supervision; must be bypassed with ≥0.01μF capacitor to GND. |
| MR | Manual reset input | Active-low input with internal 900kΩ pull-up; asserts RST when pulled ≤0.4V (0.3×VCC). |
| RST | Open-drain reset output | Pulls low when VCC falls below selected threshold; requires external pull-up to host logic voltage. |
| PFO | Open-drain power-fail output | Pulls low when VCC falls below configured power-fail threshold (150mV above RST threshold). |
| S2, S1, S0 | Threshold selection inputs | Binary-coded inputs (GND/VCC) selecting one of eight reset/power-fail threshold pairs per table. |
| GND | Device ground reference | Return path for all internal circuits; exposed pad may be connected to GND for thermal/EMI improvement. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 500nA typical enables >10-year shelf life in battery-backed SRAM or real-time clocks. |
| Configurable dual thresholds | Eight independent RST/PFO pairs allow precise matching to battery discharge curves (e.g., 2.55V/2.70V for CR2032). |
| Integrated hysteresis | 5% RST and 2.5% PFO hysteresis eliminate need for external feedback resistors or RC filters. |
| Pushbutton-compatible MR | No external pull-up required; 20μs pulse width supports miniature tactile switches with minimal debouncing. |
| DFN package footprint | 2mm × 2mm area saves >60% board space vs. legacy SOIC-8 supervisors in space-constrained wearables. |
Applications
| Battery-Powered Medical Sensors | Portable Point-of-Sale Terminals |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell, requiring low-power brownout detection and graceful shutdown before data loss. IC Role / Device Role / Timing Role: LTC2935CDC-1 monitors VCC, asserts PFO at 2.70V to trigger NMI-driven state save, then asserts RST at 2.55V to halt MCU. Use Value: 500nA ICC extends battery life beyond 2 years; 150mV PFO-RST gap ensures ≥15 seconds of safe operation after warning. |
Use Scenario: Handheld credit card reader using single alkaline AA cell, needing reliable reset during battery swap or low-voltage conditions. IC Role / Device Role / Timing Role: LTC2935CDC-1 supervises 1.5V rail, configures S2/S1/S0 for 1.60V/1.72V thresholds, and drives MCU reset via open-drain RST. Use Value: ±1.5% threshold accuracy prevents premature shutdown at 1.55V; 200ms timeout accommodates slow alkaline voltage recovery. |
| Wireless Sensor Node | Security System Keypad |
Use Scenario: LoRaWAN node powered by Li-MnO₂ primary cell, requiring early warning before radio transmission failure. IC Role / Device Role / Timing Role: LTC2935CDC-1 monitors 3.0V supply, sets PFO at 3.15V to interrupt MCU and disable RF amplifier prior to 3.00V reset. Use Value: Open-drain PFO allows pull-up to 3.3V logic while VCC drops to 1.6V, ensuring clean interface signaling during brownout. |
Use Scenario: Battery-backed keypad with tamper detection, needing fail-safe reset if backup battery depletes below operational minimum. IC Role / Device Role / Timing Role: LTC2935CDC-1 supervises 3.3V backup rail, uses MR input for emergency reset during keypad lockout events. Use Value: Internal MR pull-up eliminates external resistor, reducing BOM count; 200ms RST hold guarantees EEPROM write completion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935CTS8-1#TRPBF | Same functionality and electrical specs, but in 8-lead TSOT-23 package (2.9mm × 1.6mm) instead of DFN. | Preferred for designs requiring smaller height (<0.9mm) or compatibility with legacy TSOT-23 footprints. | Select when board space constraints favor TSOT-23 or reflow profile requires lower thermal mass. |
| LTC2934CDC-1#TRPBF | Adjustable thresholds via external resistors (not pin-selectable); 400nA ICC; same DFN package and temperature grade. | Better suited for custom threshold values outside the LTC2935's eight fixed points (e.g., 2.82V). | Choose when precise non-standard thresholds are required and design can accommodate two external resistors. |
Compared with LTC2935CTS8-1#TRPBF, the LTC2935CDC-1 offers identical supervision logic in a lower-profile, thermally superior DFN package; compared with LTC2934CDC-1#TRPBF, it trades external resistor flexibility for faster, more robust pin-strapping configuration without layout sensitivity.
Availability
LTC2935CDC-1 is available at Aetrix Electronics and suitable for battery-powered medical sensors, portable point-of-sale terminals, and wireless sensor nodes requiring stable component supply with long-term lifecycle support.
Supply support for LTC2935CDC-1 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 high-reliability analog IC portfolio, emphasizing precision, low power, and robustness for mission-critical applications.
The LTC2935 family was designed specifically for ultra-low-power battery supervision in portable and energy-harvesting systems, prioritizing nanoscale current consumption and deterministic dual-threshold behavior over general-purpose monitoring.
FAQ
What is the operating temperature range for the LTC2935CDC-1?
The LTC2935CDC-1 is specified for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix in the part number. This distinguishes it from the "I" grade (–40°C to 85°C) versions like LTC2935IDC-1. All electrical characteristics in the datasheet labeled with "l" apply across this full range.
How does the LTC2935CDC-1 differ from the LTC2935-2 variant?
The LTC2935CDC-1 corresponds to the LTC2935-1 variant, featuring open-drain RST and PFO outputs. Unlike the LTC2935-2 (active pull-up), the LTC2935CDC-1 requires external pull-up resistors but supports pull-up voltages up to 5.5V - even exceeding VCC - enabling level-shifting interfaces not possible with active-pull-up versions.
Can the LTC2935CDC-1 monitor a 1.8V supply?
Yes, the LTC2935CDC-1 supports monitoring down to 1.6V. With S2/S1/S0 set to High/High/High, it configures a 2.25V reset threshold and 2.40V power-fail threshold - both fully compatible with a 1.8V nominal supply, providing ~20% headroom before warning and ~25% before reset assertion.
What is the purpose of the exposed pad on the LTC2935CDC-1 DFN package?
The exposed pad on the LTC2935CDC-1 serves as a thermal and EMI enhancement feature. It may be left floating or connected to PCB ground - no electrical connection is required. When soldered to a thermal pad, it improves heat dissipation and reduces junction-to-board thermal resistance, supporting reliable operation at maximum ambient temperatures.
Does the LTC2935CDC-1 require external components for basic operation?
No external components are required for core supervision functionality. A 0.01μF decoupling capacitor between VCC and GND is recommended for noise immunity, but the LTC2935CDC-1 integrates all threshold references, hysteresis, reset timing, and input pull-ups - eliminating the need for external resistors, capacitors, or diodes in standard configurations.
LTC2935CDC-1 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-1 FAQ
1.How can I place an order for LTC2935CDC-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935CDC-1 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-1 reliable?
The price and inventory of LTC2935CDC-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935CDC-1 is usually 5 days.
3.What payment methods are accepted for LTC2935CDC-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935CDC-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935CDC-1?
LTC2935CDC-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935CDC-1 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-1?
For technical support, including LTC2935CDC-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935CDC-1 requirements.
6.How does Aetrix verify that LTC2935CDC-1 is sourced from the original manufacturer or authorized distributors?
All LTC2935CDC-1 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-1 meets industry standards.
7.What is the process for return or replacement of LTC2935CDC-1?
All LTC2935CDC-1 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935CDC-1, 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-1 part is unused and in its original packaging.
Return procedure for LTC2935CDC-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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