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Analog Devices Inc. LTC2907CDDB#TRMPBF
- Part No.:
- LTC2907CDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2907CDDB#TRMPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,203
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Product details
Overview
LTC2907CDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with one pin-selectable threshold input (5V/3.3V/2.5V) and one adjustable 0.5V input, featuring ±1.5% threshold accuracy over temperature, 5%/7.5%/10% selectable supply tolerance, and an externally programmable reset delay via capacitor on the TMR pin. It delivers reliable power-up/power-down/brownout reset signaling in space-constrained embedded systems.
For engineers reviewing the LTC2907CDDB#TRMPBF datasheet, LTC2907CDDB#TRMPBF pinout, LTC2907CDDB#TRMPBF application, or LTC2907CDDB#TRMPBF equivalent, this page provides verified functional specifications, DFN-8 package layout, real-world timing behavior, reset output drive characteristics, and validated alternative options for dual-rail monitoring in industrial and computing applications.
Technical Context
The LTC2907CDDB#TRMPBF implements two independent comparators - one with a resistor-programmable VADJ input referenced to a 0.5V internal bandgap, and another with a three-state S1-configurable V1 input (5V/3.3V/2.5V). Both share a common open-drain RST output and use the same internal VMAX supply derived from max(V1, VCC).
Reset assertion is triggered when either monitored voltage falls below its programmed threshold; recovery requires both inputs to remain above threshold for the full TMR-capacitor–set delay period. Glitch immunity is achieved via comparator output integration and the programmable timeout - eliminating false resets from transient noise without sacrificing ±1.5% accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Threshold Accuracy | ±1.5% of nominal voltage over –40°C to 85°C - ensures precise brownout detection without margining overhead |
| Adjustable Reset Delay | Programmable via external CTMR capacitor (e.g., 22nF = 200ms) - enables alignment with processor power-on requirements |
| VADJ Input Threshold | 0.465V to 0.508V at 10% tolerance - supports custom trip points down to 0.6V using external resistor dividers |
| V1 Input Options | Selectable 5V/3.3V/2.5V thresholds via S1 pin (V1/GND/open) - eliminates external resistors for standard rails |
| Supply Tolerance Options | 5%, 7.5%, or 10% via TOL pin (V1/open/GND) - enables system-level voltage margining during validation |
| RST Output Type | Open-drain with guaranteed low state (≤0.4V @ 2.5mA) and weak pull-up to VMAX - supports wired-OR reset buses |
| Operating Voltage Range | V1/VCC: –0.3V to 7V; VADJ/S1/TOL: –0.3V to (VMAX + 0.3V) - accommodates auxiliary supplies and noisy environments |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), exposed pad soldered to PCB for thermal and electrical GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Optional auxiliary supply input | Provides backup power path for RST logic when V1 drops; VMAX = max(V1, VCC) powers all outputs |
| RST (Pin 2) | Inverted reset output | Open-drain active-low signal; asserts low when V1 or VADJ falls below threshold and holds low for TMR delay after recovery |
| GND (Pin 4) | Ground reference | Primary ground return; exposed pad (Pin 9) must be soldered to PCB GND plane for thermal stability and noise immunity |
| TOL (Pin 5) | Tolerance selection input | Three-state control (V1/open/GND) sets common 5%/7.5%/10% tolerance for both V1 and VADJ thresholds |
| S1 (Pin 6) | V1 threshold selection input | Three-state control (V1/open/GND) selects 5V/3.3V/2.5V nominal V1 trip point without external components |
| VADJ (Pin 7) | Adjustable monitor input | Accepts divided-down voltage; comparator trips at 0.5V ±1.5% × tolerance - enables custom rail monitoring |
| V1 (Pin 8) | Primary supply input | Main rail to monitor; also used as logic reference for S1/TOL programming and as VMAX source if > VCC |
| TMR (Pin 2, alternate function) | Reset delay timing input | Capacitor-to-GND sets tRST = 9ms/nF; open circuit yields ~200µs minimum delay - replaces fixed-delay ICs |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% threshold accuracy over temperature | Reduces system voltage margining requirement by ≥1% vs ±2.5% alternatives, lowering power supply cost and size |
| Three-state S1/TOL programming | Eliminates external resistors and configuration jumpers - simplifies BOM and layout for multi-rail systems |
| Guaranteed RST operation down to V1 ≥ 1V or VCC ≥ 1V | Ensures valid reset signaling during deep brownout, enabling safe processor shutdown before data corruption |
| Internal VCC auto-select (VMAX = max(V1, VCC)) | Enables robust reset generation even if primary rail fails, provided auxiliary VCC remains ≥1V |
| Power supply glitch immunity | Combines comparator integration + programmable delay to reject transients <200ms duration without hysteresis penalty |
Applications
| Desktop & Notebook Computers | Network Servers |
|---|---|
Use Scenario: Monitoring 3.3V I/O and 1.8V core rails during cold boot and thermal throttling events. IC Role / Device Role / Timing Role: Dual-rail supervisor generating synchronized reset pulse only after both rails stabilize above 3.3V/1.8V thresholds with 200ms delay. Use Value: Prevents CPU lockup from partial rail sequencing; ±1.5% accuracy avoids unnecessary reboots during marginal voltage dips. | Use Scenario: Validating redundant 12V and 5V PSUs in blade server chassis with margining capability. IC Role / Device Role / Timing Role: Simultaneous monitoring of main and standby supplies with 10% tolerance mode for production burn-in stress testing. Use Value: Enables automated voltage margining without firmware changes - reduces test time by eliminating manual resistor swaps. |
| Handheld Devices | Core, I/O Monitor |
Use Scenario: Managing battery-backed 3.3V logic and 2.5V sensor interface rails in medical wearables. IC Role / Device Role / Timing Role: Low-quiescent-current (≤100µA) dual monitor asserting RST during battery sag below 3.3V or sensor rail dropout. Use Value: 1mm-profile DFN package saves PCB area; guaranteed operation down to V1 = 1V extends usable battery life. | Use Scenario: Coordinating power sequencing between FPGA core (1.2V) and I/O banks (3.3V) in industrial PLCs. IC Role / Device Role / Timing Role: Configured with V1 = 3.3V (S1=open) and VADJ = 1.2V (via 49.9k/100k divider) to enforce strict sequencing order. Use Value: Adjustable TMR capacitor allows fine-tuning of reset hold time to match FPGA configuration window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2906CDDB#TRMPBF | Fixed 200ms reset delay; no TMR pin - uses internal timer instead of external capacitor | Best for cost-sensitive designs where delay is invariant; lacks flexibility for varying processor requirements | Select LTC2906CDDB#TRMPBF when fixed delay suffices and board space for timing capacitor must be minimized |
| TPS3808G33DBVR | Single-input supervisor (3.3V only); no adjustable VADJ or multi-threshold V1 - requires external resistors for custom rails | Suitable only for single-rail monitoring; cannot replace dual-input functionality without redesign | Choose TPS3808G33DBVR only for simple 3.3V-only systems where dual monitoring is unnecessary |
Compared with LTC2906CDDB#TRMPBF and TPS3808G33DBVR, the LTC2907CDDB#TRMPBF uniquely combines dual-rail monitoring, pin-selectable thresholds, and capacitor-programmable delay in a single DFN-8 package - enabling flexible, space-efficient power supervision without external passive components for most configurations.
Availability
LTC2907CDDB#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and handheld devices requiring stable component supply, precise dual-rail monitoring, and long-term industrial lifecycle support.
Supply support for LTC2907CDDB#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 high-precision analog product portfolio, including supervisors, references, and signal conditioning ICs for demanding industrial and computing applications.
The LTC2907CDDB#TRMPBF belongs to Linear's precision power monitoring family, designed specifically for systems requiring accurate, glitch-immune dual-supply supervision with minimal external components and configurable timing.
FAQ
What is the operating temperature range for the LTC2907CDDB#TRMPBF?
The LTC2907CDDB#TRMPBF is rated for commercial temperature operation from 0°C to 70°C. Its specified ±1.5% threshold accuracy, 5%/7.5%/10% tolerance options, and TMR-based delay timing are all guaranteed across this full range. For extended industrial use, the LTC2907IDDB#TRMPBF variant supports –40°C to 85°C.
How do I configure the LTC2907CDDB#TRMPBF to monitor a 5V rail and a 2.5V rail?
To monitor 5V and 2.5V rails with the LTC2907CDDB#TRMPBF, connect V1 to the 5V rail and set S1 = V1 (per Table 1). For the 2.5V rail, use a resistor divider (e.g., 365kΩ/100kΩ) from the 2.5V rail to GND, connecting the divider tap to VADJ. Set TOL = GND for 10% tolerance on both inputs.
Does the LTC2907CDDB#TRMPBF require external pull-up resistors on the RST pin?
The LTC2907CDDB#TRMPBF features an internal weak pull-up to VMAX on RST, sufficient for most applications. However, if fast rise time (>10µs) or guaranteed VOH > VMAX is required, add an external pull-up resistor (e.g., 10kΩ). Note that doing so increases total pull-up strength, requiring stronger pull-downs in wired-OR configurations.
Can the LTC2907CDDB#TRMPBF operate with only V1 applied, without VCC?
Yes - the LTC2907CDDB#TRMPBF operates with only V1 applied. VCC is optional; when absent, V1 becomes VMAX and powers all internal circuitry and the RST output. The device guarantees correct RST logic state for V1 ≥ 1V, making it functional even during deep brownout conditions.
What is the maximum leakage current allowed on the S1 and TOL pins when left open?
When S1 or TOL is left unconnected (high-impedance state), the LTC2907CDDB#TRMPBF specifies a maximum leakage current of ±10µA to either V1 or GND. This ensures reliable three-state interpretation without unintended threshold selection due to PCB contamination or stray coupling.
LTC2907CDDB#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:
- 2
- Voltage - Threshold:
- 2.5V, 3.3V, 5V, Adj
- 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 (3x2)
LTC2907CDDB#TRMPBF FAQ
1.How can I place an order for LTC2907CDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2907CDDB#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 LTC2907CDDB#TRMPBF reliable?
The price and inventory of LTC2907CDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2907CDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2907CDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2907CDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2907CDDB#TRMPBF?
LTC2907CDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2907CDDB#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 LTC2907CDDB#TRMPBF?
For technical support, including LTC2907CDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2907CDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC2907CDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2907CDDB#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 LTC2907CDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2907CDDB#TRMPBF?
All LTC2907CDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2907CDDB#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 LTC2907CDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2907CDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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