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Analog Devices Inc. LTC2935CDC-4
- Part No.:
- LTC2935CDC-4
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935CDC-4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
LTC2935CDC-4 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 (1.60V–2.40V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered portable equipment requiring reliable early-warning shutdown and controlled system reset.
For engineers reviewing the LTC2935CDC-4 datasheet, LTC2935CDC-4 pinout, LTC2935CDC-4 application, or LTC2935CDC-4 equivalent, this page delivers verified functional identity, DFN-8 package mapping, threshold configuration logic, PFO/RST output behavior under rising/falling VCC, manual reset timing, and real-world substitution guidance - all grounded in the official LTC2935 datasheet (Rev. FA) and ordering documentation.
Technical Context
The LTC2935CDC-4 implements dual independent comparators: one for reset generation (VRTF) and one for early power-fail warning (VPFT), with VPFT fixed 120mV above the selected VRTF. Its internal precision attenuators and reference enable stable threshold selection across –40°C to 85°C without external resistors.
It features a 200ms internal reset timeout timer activated on VCC rise, 5% hysteresis on reset threshold, 2.5% hysteresis on power-fail threshold, and active-pull-up RST/PFO outputs referenced to VCC - eliminating external pull-up resistors while constraining output voltage to ≤VCC.
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 Range | 1.60V to 2.40V (8 pin-selectable values) - covers common low-voltage rails (1.8V, 2.5V, 3.3V systems via attenuation). |
| Power-Fail Threshold Offset | +120mV above selected reset threshold - provides deterministic early warning margin before reset assertion. |
| Threshold Accuracy | ±1.5% max over –40°C to 85°C - ensures reliable trip points across industrial temperature range. |
| Reset Timeout | 200ms (140–260ms min–max) - guarantees sufficient processor initialization time after VCC recovery. |
| Output Type | Active pull-up (RST & PFO) - drives high to VCC; no external pull-ups required; output clamped at VCC. |
| Operating Temp Range | 0°C to 70°C (C-grade) - validated for commercial portable and point-of-sale 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 & monitored input | Primary voltage rail under supervision; powers IC and serves as reference for threshold detection. |
| MR | Manual reset input | Active-low input with internal 900kΩ pull-up; falling edge forces RST low for ≥200ms after release. |
| RST | Reset output | Active-pull-up output; goes low when VCC < selected reset threshold; returns high 200ms after VCC exceeds threshold +5% hysteresis. |
| PFO | Power-fail output | Active-pull-up output; goes low when VCC < (selected reset threshold + 120mV); returns high after VCC exceeds that level +2.5% hysteresis. |
| S2, S1, S0 | Threshold select inputs | Binary-coded inputs (GND/VCC) selecting one of eight reset/power-fail threshold pairs per Table 1. |
| GND | Ground reference | System ground return for all internal circuits and comparator references. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 500nA typical - preserves battery life in always-on monitoring applications like security sensors. |
| Pin-selectable thresholds | 8 discrete reset/power-fail pairs set by S2/S1/S0 - eliminates trimming resistors and simplifies BOM. |
| Early power-fail warning | Dedicated PFO output with fixed +120mV offset - enables graceful shutdown before brownout resets. |
| Integrated reset timer & hysteresis | 200ms timeout + 5% VRTF hysteresis - prevents chatter during noisy or slowly recovering supplies. |
| Active-pull-up outputs | RST and PFO drive to VCC - removes need for external pull-ups and avoids overvoltage risk on logic interfaces. |
Applications
| Portable Medical Sensors | Battery-Powered Point-of-Sale Terminals |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell, requiring low-power supervision and early low-battery alert. IC Role / Device Role / Timing Role: LTC2935CDC-4 monitors VCC, asserts PFO at 2.55V (early warning), then RST at 2.40V (shutdown trigger). Use Value: Enables 24+ month battery life with deterministic shutdown before data corruption occurs. |
Use Scenario: Handheld credit card terminal using alkaline AA batteries, needing reliable reset on cold start and low-voltage warning before transaction failure. IC Role / Device Role / Timing Role: LTC2935CDC-4 supervises 3.0V regulated rail, triggers PFO at 3.15V and RST at 3.00V during discharge. Use Value: Prevents partial transaction commits by initiating firmware-controlled save-and-shutdown sequence upon PFO assertion. |
| Wireless Sensor Node | Industrial Security Panel Backup |
Use Scenario: LoRaWAN node powered by Li-ion with LDO, requiring wake-up reset integrity and battery health monitoring. IC Role / Device Role / Timing Role: LTC2935CDC-4 monitors post-LDO VCC, uses MR for hardware-initiated deep-sleep exit, and PFO to log low-battery events. Use Value: Guarantees clean MCU reset on power-up and enables predictive maintenance via PFO-triggered telemetry. |
Use Scenario: Fire alarm control panel with supercapacitor backup, needing fail-safe reset during AC loss and early capacitor depletion warning. IC Role / Device Role / Timing Role: LTC2935CDC-4 supervises 2.5V backup rail, asserts PFO at 2.20V (capacitor sag warning) and RST at 2.08V (last-resort reset). Use Value: Extends functional uptime by 15–30 seconds via PFO-driven state preservation before final brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-4#TRPBF | Same functionality and pinout, but rated for –40°C to 85°C industrial temp range; TSOT-23-8 package (smaller footprint, higher θJA = 195°C/W). | Required for extended temperature deployments (e.g., outdoor kiosks, automotive accessories). | Select when operating ambient exceeds 70°C or board space constraints favor TSOT-23 over DFN. |
| LTC2934CDC-4#TRPBF | Adjustable thresholds via external resistor divider (not pin-selectable); same 500nA IQ, active-pull-up outputs, and 200ms timeout. | Used where dynamic threshold tuning is needed (e.g., multi-battery chemistries sharing one PCB). | Choose only if design requires field-programmable thresholds; otherwise LTC2935CDC-4 offers simpler, more robust fixed-point supervision. |
Compared with LTC2935ITS8-4#TRPBF, LTC2935CDC-4 trades temperature range for lower thermal resistance (θJA = 102°C/W vs 195°C/W) and identical DFN mounting; compared with LTC2934CDC-4#TRPBF, it replaces resistor-based adjustment with deterministic, production-tested pin-strapping - reducing calibration risk and component count.
Availability
LTC2935CDC-4 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered point-of-sale terminals, wireless sensor nodes, and industrial security panel backup systems requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC2935CDC-4 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 full product continuity, technical support, and manufacturing for the LTC portfolio. Linear's legacy analog expertise underpins high-precision, low-power supervision ICs.
The LTC2935 family was designed specifically for ultra-low-power battery supervision in portable and energy-constrained systems - emphasizing nanoscale quiescent current, factory-trimmed thresholds, and integrated hysteresis/timing to eliminate external components.
FAQ
What is the exact reset threshold range supported by LTC2935CDC-4?
The LTC2935CDC-4 supports eight discrete reset thresholds ranging from 1.60V to 2.40V in 120mV steps (e.g., 1.60V, 1.72V, 1.84V…2.40V), selected via binary coding on S2/S1/S0 pins. These values are specified for the LTC2935-3/LTC2935-4 variant group and confirmed in the Electrical Characteristics table on page 3 of the LTC2935 datasheet (Rev. FA). Each threshold has ±1.5% max accuracy over temperature.
Does LTC2935CDC-4 require external pull-up resistors on RST and PFO?
No - the LTC2935CDC-4 features active-pull-up outputs on both RST and PFO, driving high to VCC internally. This eliminates the need for external pull-up resistors, reduces BOM count, and avoids potential overvoltage issues seen with open-drain alternatives. However, if the output must remain valid down to VCC = 0V, a 100kΩ pull-down resistor from RST or PFO to GND is recommended to prevent floating states.
How does the power-fail output (PFO) behave relative to the reset output (RST) in LTC2935CDC-4?
In the LTC2935CDC-4, the PFO threshold is fixed at +120mV above the selected reset threshold (e.g., if RST trips at 2.40V, PFO trips at 2.52V). PFO asserts low first during VCC fall, providing early warning; RST follows when VCC drops further. On VCC rise, PFO releases when VCC exceeds its threshold +2.5% hysteresis, while RST releases after VCC exceeds its threshold +5% hysteresis plus a 200ms timeout - ensuring sequenced recovery.
Can LTC2935CDC-4 be used with a 1.8V supply rail?
Yes - the lowest reset threshold of the LTC2935CDC-4 is 1.60V, making it compatible with 1.8V systems. When configured for 1.60V reset (S2=S1=S0=High), the PFO activates at 1.72V, providing usable headroom. The device operates with VCC from 1.0V to 5.5V, and its 500nA quiescent current ensures minimal loading on low-voltage rails. Performance is fully specified down to 1.0V VCC.
What is the function of the MR (manual reset) input on LTC2935CDC-4?
The MR input on LTC2935CDC-4 is an active-low, internally pulled-up (900kΩ) signal that forces the RST output low when asserted. After MR is released (returns high), RST remains low for a guaranteed 200ms timeout - matching the automatic reset timeout. This allows hardware-initiated system reset independent of VCC level, commonly used with pushbutton switches in portable devices. MR is fully functional even when VCC is below reset threshold.
LTC2935CDC-4 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:
- 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-4 FAQ
1.How can I place an order for LTC2935CDC-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935CDC-4 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-4 reliable?
The price and inventory of LTC2935CDC-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935CDC-4 is usually 5 days.
3.What payment methods are accepted for LTC2935CDC-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935CDC-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935CDC-4?
LTC2935CDC-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935CDC-4 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-4?
For technical support, including LTC2935CDC-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935CDC-4 requirements.
6.How does Aetrix verify that LTC2935CDC-4 is sourced from the original manufacturer or authorized distributors?
All LTC2935CDC-4 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-4 meets industry standards.
7.What is the process for return or replacement of LTC2935CDC-4?
All LTC2935CDC-4 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935CDC-4, 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-4 part is unused and in its original packaging.
Return procedure for LTC2935CDC-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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