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Analog Devices Inc. LTC2904ITS8#TRPBF
- Part No.:
- LTC2904ITS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2904ITS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
LTC2904ITS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with pin-selectable thresholds, designed for systems requiring simultaneous monitoring of two voltage rails. It features ±1.5% threshold accuracy over –40°C to +85°C, 200ms fixed reset delay, open-drain RST output, and guaranteed operation down to 1V input. It is used in embedded power sequencing for industrial controllers and network infrastructure equipment.
For engineers reviewing the LTC2904ITS8#TRPBF datasheet, LTC2904ITS8#TRPBF pinout, LTC2904ITS8#TRPBF application, or LTC2904ITS8#TRPBF equivalent, key selection criteria include its fixed 200ms reset timeout, TSOT-23-8 package compatibility, 8-pin three-state programming interface (S1/S2/TOL), and support for 5V/3.3V, 3.3V/2.5V, and other dual-rail combinations without external components.
Technical Context
The LTC2904ITS8#TRPBF implements two independent comparators with a shared reset pulse generator and internal bandgap reference. Its threshold selection logic decodes three-state inputs (S1, S2, TOL) into nine V1/V2 voltage pairs and three tolerance levels (5%, 7.5%, 10%), enabling precise brownout detection without trimming resistors.
It uses internal VCC auto-select (VCC = max(V1,V2)), ensuring functional reset assertion during power-up when either monitored rail reaches ≥1V. Glitch immunity is achieved via comparator output integration and the 200ms delay timer, preventing false resets from transient supply noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Delay | Fixed 200ms timeout ensures reliable microprocessor reset hold time after power stabilization. |
| Threshold Accuracy | ±1.5% over full temperature range guarantees tight trip-point control for safety-critical brownout response. |
| Supply Range (V1/V2) | Supports 1.0V–5.0V input pairs (e.g., 5V/3.3V, 3.3V/1.2V) with programmable thresholds per Table 1. |
| RST Output Type | Open-drain configuration enables wired-OR reset bus sharing and flexible pull-up voltage selection. |
| Operating Temp | –40°C to +85°C industrial grade rating supports deployment in harsh ambient environments. |
| Package | 8-lead TSOT-23 (0.65mm pitch) provides compact footprint for space-constrained PCB layouts. |
| Input Current (V2) | ≤1.0μA max at V2 ensures minimal loading on low-power rails like 1.2V or 1.0V core supplies. |
Pinout & Package
Package: 8-lead Plastic TSOT-23 (0.65mm pitch), 1.95mm × 2.80mm footprint, 1.00mm max height, exposed pad not present (unlike DFN variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 (Pin 1) | Voltage Input 2 | Monitors second rail (e.g., 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, or 1.0V); also contributes to internal VCC. |
| RST (Pin 2) | Reset Logic Output | Active-low open-drain output; asserts low when any input falls below threshold and holds for 200ms after recovery. |
| RST (Pin 3) | Inverted Reset Output | Complementary to Pin 2; pulls low only when both inputs are above threshold and delay expires. |
| GND (Pin 4) | Ground Reference | Primary return path for internal circuitry and comparator references; must be low-impedance. |
| TOL (Pin 5) | Tolerance Select Input | Three-state pin (V1/Open/GND) sets common tolerance: 5%/7.5%/10% for both V1 and V2 thresholds. |
| S1 (Pin 6) | Voltage Threshold Select | Three-state pin defining V1/V2 pair (e.g., 5V/3.3V, 3.3V/2.5V); see Table 1 for mapping. |
| S2 (Pin 7) | Voltage Threshold Select | Second three-state pin completing V1/V2 combination selection with S1 and TOL. |
| V1 (Pin 8) | Voltage Input 1 | Monitors primary rail (5V, 3.3V, or 2.5V); determines internal VCC if higher than V2. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable thresholds | 27 unique V1/V2/tolerance combinations via S1/S2/TOL pins eliminate BOM proliferation across voltage variants. |
| Glitch-immune reset | Integrated comparator filtering + 200ms delay prevents spurious resets from sub-5Hz supply transients. |
| 1V minimum operating input | Guaranteed RST assertion and correct logic state even when V1 or V2 drops to 1V, enabling early fault detection. |
| Low quiescent current | Typical 65μA V1 input current and ≤1μA V2 current minimize impact on battery-backed or ultra-low-power rails. |
| Internal VCC auto-select | Automatic use of higher of V1/V2 as supply eliminates need for dedicated bias rail or LDO. |
Applications
| Industrial PLC Power Sequencing | Network Switch Core/I/O Monitoring |
|---|---|
Use Scenario: Monitoring 3.3V I/O and 1.2V FPGA core rails during cold start and brownout events in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-rail supervisor providing synchronized 200ms reset pulse to FPGA and peripheral ASICs upon undervoltage detection. Use Value: Prevents metastability and configuration corruption by enforcing strict power-good timing before logic initialization. | Use Scenario: Ensuring stable 5V DC/DC output and 3.3V PHY supply in Ethernet switch line cards before link training begins. IC Role / Device Role / Timing Role: Simultaneous dual-supply monitor asserting RST until both rails exceed 4.75V and 3.135V respectively for ≥200ms. Use Value: Eliminates need for discrete RC timers and voltage dividers, reducing component count and layout area by >40%. |
| Medical Diagnostic Imaging Module | Automated Test Equipment (ATE) |
Use Scenario: Validating 2.5V analog front-end and 1.8V digital signal processor supplies in portable ultrasound units. IC Role / Device Role / Timing Role: Precision dual monitor with ±1.5% threshold accuracy ensuring compliance with IEC 62304 safety-critical power validation requirements. Use Value: Meets Class C software safety integrity level (SIL) by guaranteeing deterministic reset behavior under worst-case temperature drift. | Use Scenario: Enabling voltage margining on 5V and 3.3V test rails using S1/S2/TOL pins to verify system robustness across ±5% tolerance boundaries. IC Role / Device Role / Timing Role: Programmable supervisor allowing automated test sequences to sweep threshold combinations without hardware changes. Use Value: Reduces qualification test time by 65% versus manual resistor swapping and eliminates calibration errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816EUT+T | Single-supply monitor with watchdog timer; no dual-rail threshold programming or 200ms fixed delay. | Requires external logic for dual-rail AND function; lacks pin-selectable tolerance. | Select only if watchdog functionality is required and dual-rail coordination is handled externally. |
| TPS3808G33DBVR | Single-channel 3.3V supervisor with adjustable delay; no V1/V2 programming or multi-tolerance support. | Needs two devices plus OR gate for dual-rail monitoring; increases board area and BOM cost. | Choose when only one rail requires supervision or when design already uses TI ecosystem tools. |
Compared with MAX6816EUT+T and TPS3808G33DBVR, the LTC2904ITS8#TRPBF uniquely integrates dual-rail comparison, 27-programmable thresholds, and fixed 200ms delay in a single TSOT-23-8 package-reducing component count, eliminating external passives, and simplifying layout for space-constrained industrial designs.
Availability
LTC2904ITS8#TRPBF is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, and medical electronics requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2904ITS8#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 LTC2904ITS8#TRPBF belongs to Linear's precision power monitoring product line, engineered for mission-critical systems where deterministic reset timing, wide temperature operation, and zero-component threshold configuration are mandatory.
FAQ
What is the operating temperature range for the LTC2904ITS8#TRPBF?
The LTC2904ITS8#TRPBF is rated for –40°C to +85°C, making it suitable for industrial and extended-temperature applications. This specification is confirmed in the "ORDER INFORMATION" table of the datasheet, where the "I" grade denotes the industrial temperature range, and the part marking "LTBCK" corresponds to this grade in the TSOT-23 package.
Does the LTC2904ITS8#TRPBF require external components to set its reset thresholds?
No, the LTC2904ITS8#TRPBF does not require external resistors or capacitors to set its reset thresholds. All 27 combinations of V1/V2 voltage pairs and tolerance levels (5%, 7.5%, 10%) are configured solely via the three three-state programming pins S1, S2, and TOL, as defined in Tables 1 and 2 of the datasheet.
How does the LTC2904ITS8#TRPBF handle power-up sequencing when V1 and V2 rise at different rates?
The LTC2904ITS8#TRPBF uses internal VCC auto-select (VCC = max(V1,V2)) to power its internal circuitry. As soon as either V1 or V2 reaches ≥1V, the RST output asserts low. Once both inputs exceed their programmed thresholds and remain stable for 200ms, RST releases. This ensures robust power-up sequencing without external timing components.
Can the LTC2904ITS8#TRPBF monitor a 1.0V rail paired with a 3.3V rail?
Yes, the LTC2904ITS8#TRPBF supports the 3.3V/1.0V combination. Per Table 1 in the datasheet, setting S1 = V1 and S2 = GND selects V1 = 3.3V and V2 = 1.0V. The corresponding threshold for V2 is 0.900V (10% tolerance), with ±1.5% accuracy ensuring reliable detection down to 0.885V over temperature.
What is the maximum load capacitance the RST pin can drive while maintaining specified rise time?
With only the internal 6μA pull-up, the RST pin achieves ~86μs rise time into 150pF. For faster edges, an external pull-up resistor is recommended: a 10kΩ resistor reduces rise time to ~3.3μs at 150pF. The datasheet confirms this behavior in the "Output Rise and Fall Time Estimation" section and Figure G14–G16.
LTC2904ITS8#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
LTC2904ITS8#TRPBF FAQ
1.How can I place an order for LTC2904ITS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2904ITS8#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 LTC2904ITS8#TRPBF reliable?
The price and inventory of LTC2904ITS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2904ITS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2904ITS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2904ITS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2904ITS8#TRPBF?
LTC2904ITS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2904ITS8#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 LTC2904ITS8#TRPBF?
For technical support, including LTC2904ITS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2904ITS8#TRPBF requirements.
6.How does Aetrix verify that LTC2904ITS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2904ITS8#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 LTC2904ITS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2904ITS8#TRPBF?
All LTC2904ITS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2904ITS8#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 LTC2904ITS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC2904ITS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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