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Analog Devices Inc. LTC2905ITS8#TRPBF
- Part No.:
- LTC2905ITS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2905ITS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
LTC2905ITS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision dual supply voltage monitor IC with adjustable reset timeout, open-drain RST output, ±1.5% threshold accuracy over –40°C to +85°C, and programmable thresholds for V1 (5V/3.3V/2.5V) and V2 (3.3V/2.5V/1.8V/1.5V/1.2V/1.0V) via three-state pins S1, S2, and TOL. It is used in embedded power sequencing and fault detection for multi-rail systems.
For engineers reviewing the LTC2905ITS8#TRPBF datasheet, LTC2905ITS8#TRPBF pinout, LTC2905ITS8#TRPBF application, or LTC2905ITS8#TRPBF equivalent, key selection criteria include its TSOT-23-8 package, adjustable 200μs–295ms reset delay via external capacitor on TMR pin, guaranteed RST operation down to V1 ≥ 1V or V2 ≥ 1V, and support for nine voltage combinations with 5%/7.5%/10% tolerance options.
Technical Context
The LTC2905ITS8#TRPBF implements two independent high-accuracy comparators referenced to a bandgap, with internal resistor networks selecting thresholds based on S1/S2/TOL logic states. Its reset pulse generator uses an external capacitor on the TMR pin to set delay time (tRST = CTMR × 110 ns⁻¹), enabling precise timing control across temperature.
It features glitch immunity via integrated low-pass filtering at comparator outputs and a retriggerable timer that resets on any voltage dip during the timeout period. The device derives internal VCC from the higher of V1 or V2, ensuring functional operation even when only one rail is present above 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Input Range | Selectable nominal: 5V, 3.3V, or 2.5V - determines first monitored rail and contributes to internal VCC |
| V2 Input Range | Selectable nominal: 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, or 1.0V - second monitored rail; VCC = max(V1,V2) |
| Threshold Accuracy | ±1.5% over full –40°C to +85°C - ensures reliable trip point without margining overhead |
| Reset Timeout Range | 200μs (TMR open) to 295ms (CTMR = 22nF) - configurable for microprocessor reset hold requirements |
| RST Output Type | Open-drain with weak internal pull-up to VCC - supports wired-OR, level-shifting, and external pull-up for faster rise |
| Minimum Operating Voltage | V1 ≥ 1V or V2 ≥ 1V guarantees correct RST logic state - enables monitoring during brownout and partial power-up |
| Supply Tolerance Options | 5%, 7.5%, or 10% - selected via TOL pin; larger tolerance lowers trip threshold proportionally |
Pinout & Package
Package: 8-lead Plastic TSOT-23 (3.0mm × 1.75mm × 1.0mm height), RoHS-compliant, lead-free finish. Exposed pad not present (unlike DFN variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 (Pin 1) | Voltage Input 2 | Second monitored supply rail; sets lower threshold; bypass with 0.1μF to GND |
| TMR (Pin 2) | Reset Delay Timing Input | Connect external capacitor to GND to program tRST (9ms/nF); open = ~200μs min delay |
| RST (Pin 3) | Inverted Reset Output | Active-low open-drain output; pulls low when either V1 or V2 falls below threshold; weak internal pull-up to VCC |
| GND (Pin 4) | Ground Reference | Primary return path; must be low-impedance connection for accurate threshold sensing |
| TOL (Pin 5) | Tolerance Selection Input | Three-state pin: V1 = 5%, open = 7.5%, GND = 10% - applies to both V1 and V2 thresholds |
| S1 (Pin 6) | Voltage Threshold Select 1 | Three-state pin defining V1/V2 combination per Table 1; connects to V1, GND, or left open |
| S2 (Pin 7) | Voltage Threshold Select 2 | Three-state pin defining V1/V2 combination per Table 1; connects to V1, GND, or left open |
| V1 (Pin 8) | Voltage Input 1 | First monitored supply rail; sets upper threshold; bypass with 0.1μF to GND; also supplies VCC |
Key Features
| Feature | Design Value |
|---|---|
| 27 programmable threshold/tolerance combinations | Three 3-state inputs (S1, S2, TOL) eliminate need for multiple part numbers across voltage variants |
| Adjustable reset timeout (200μs–295ms) | External capacitor on TMR pin enables precise match to processor reset timing requirements |
| Guaranteed operation down to 1V input | Enables valid reset assertion during brownout, partial power-up, or single-rail failure scenarios |
| Glitch-immune comparator architecture | Integrated low-pass filtering prevents false triggering from supply noise near threshold |
| Open-drain RST with weak VCC-referenced pull-up | Supports wired-OR reset buses and eliminates need for external pull-up unless fast rise required |
Applications
| Desktop & Notebook Computers | Network Servers |
|---|---|
Use Scenario: Monitoring 5V standby and 3.3V main rails during cold boot and sleep/wake transitions. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting system reset until both supplies stabilize above programmed thresholds with 200ms delay. Use Value: Prevents CPU lockup by ensuring clean power sequencing before firmware execution begins. | Use Scenario: Validating 12V intermediate bus and 1.2V core voltage in multi-phase VRM systems. IC Role / Device Role / Timing Role: Independent V1/V2 monitoring with asymmetric tolerance (10% on 12V, 5% on 1.2V) to accommodate different ripple profiles. Use Value: Enables early fault detection on sensitive core rail while tolerating higher noise on bulk supply. |
| Handheld Devices | Industrial Embedded Controllers |
Use Scenario: Supervising battery-backed 3.3V I/O and 1.8V SoC rails in portable medical instruments. IC Role / Device Role / Timing Role: Low-quiescent-current dual monitor with V2 = 1.8V and V1 = 3.3V, using 7.5% tolerance to balance noise immunity and headroom. Use Value: Extends battery life via micropower operation (<130μA total supply current) while maintaining robust reset behavior. | Use Scenario: Ensuring stable 2.5V FPGA configuration and 1.0V I/O supply in factory automation PLC modules. IC Role / Device Role / Timing Role: High-temperature-rated variant (–40°C to +85°C) monitoring critical rails with 5% tolerance for tight-margin designs. Use Value: Guarantees deterministic reset under extended thermal cycling, eliminating field failures due to marginal supply dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V/3.3V dual monitor; no V1/V2 flexibility; fixed 200ms delay; ±2.0% threshold accuracy | Only supports identical dual-rail voltages; lacks programmable tolerance and voltage combinations | Choose when design uses matched 3.3V rails and requires TI-qualified automotive-grade AEC-Q100 option |
| MAX6816EUT+T | Single 3.3V supply monitor; no dual-input capability; fixed 140ms delay; ±1.5% accuracy; SOT-23-6 | Cannot monitor two independent rails; lacks S1/S2/TOL programming interface | Choose only for single-rail systems where footprint and cost are prioritized over dual-monitor functionality |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2905ITS8#TRPBF uniquely supports nine distinct V1/V2 combinations and three tolerance levels in a single TSOT-23-8 package, enabling one-part-fits-many designs without layout changes or BOM proliferation.
Availability
LTC2905ITS8#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, handheld devices, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.
Supply support for LTC2905ITS8#TRPBF 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 LTC2905ITS8#TRPBF belongs to Linear's precision power supervision product line, designed specifically for space-constrained, multi-rail systems requiring high threshold accuracy, flexible voltage combinations, and robust noise immunity without external components.
FAQ
What is the operating temperature range for the LTC2905ITS8#TRPBF?
The LTC2905ITS8#TRPBF is rated for –40°C to +85°C ambient operation (I-grade). This range is confirmed in the "ORDER INFORMATION" table of the datasheet and applies to all electrical specifications unless otherwise noted. The device uses internal bandgap reference and trimmed resistor networks to maintain ±1.5% threshold accuracy across this full range.
How do I configure the LTC2905ITS8#TRPBF to monitor 3.3V and 1.2V supplies?
To configure the LTC2905ITS8#TRPBF for 3.3V and 1.2V monitoring, set S1 = Open, S2 = Open, and TOL = GND (for 10% tolerance) per Table 1 in the datasheet. This selects V1 = 3.3V and V2 = 1.2V. Bypass both V1 and V2 pins with 0.1μF capacitors to GND. The resulting thresholds are 2.970V (3.3V × 0.9) and 1.080V (1.2V × 0.9), respectively.
Can the LTC2905ITS8#TRPBF operate if only one supply rail is present?
Yes. The LTC2905ITS8#TRPBF derives its internal VCC from the greater of V1 or V2. As long as either V1 ≥ 1V or V2 ≥ 1V, the RST output is guaranteed to assert correctly. For example, if only V1 = 2.5V is powered, VCC = 2.5V, and the device monitors V1 against its programmed threshold while ignoring V2 (which may be unconnected or at 0V).
What capacitor value gives a 200ms reset timeout on the LTC2905ITS8#TRPBF?
A 22nF capacitor between the TMR pin and GND yields a nominal 200ms reset timeout for the LTC2905ITS8#TRPBF. This follows the formula tRST = CTMR × 110 ns⁻¹, so CTMR = 200ms ÷ 110 ns⁻¹ = 22nF. The datasheet confirms this value in Figure 1 and Typical Application TA04.
Is an external pull-up resistor required on the RST pin of the LTC2905ITS8#TRPBF?
No external pull-up is required for basic operation - the LTC2905ITS8#TRPBF includes a weak internal pull-up to VCC (~6μA). However, an external pull-up (e.g., 10kΩ) is recommended if faster rise time (<1μs) or VOH > VCC is needed. The internal pull-up resistance varies with VCC (e.g., ~260kΩ at 3.3V), yielding ~86μs rise time with 150pF load.
LTC2905ITS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 9 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2905ITS8#TRPBF FAQ
1.How can I place an order for LTC2905ITS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2905ITS8#TRPBF 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 LTC2905ITS8#TRPBF reliable?
The price and inventory of LTC2905ITS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2905ITS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2905ITS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2905ITS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2905ITS8#TRPBF?
LTC2905ITS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2905ITS8#TRPBF 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 LTC2905ITS8#TRPBF?
For technical support, including LTC2905ITS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2905ITS8#TRPBF requirements.
6.How does Aetrix verify that LTC2905ITS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2905ITS8#TRPBF 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 LTC2905ITS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2905ITS8#TRPBF?
All LTC2905ITS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2905ITS8#TRPBF, 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 LTC2905ITS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC2905ITS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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