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Analog Devices Inc. LTC2908CTS8-B1#TRMPBF
- Part No.:
- LTC2908CTS8-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2908CTS8-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 6 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2908CTS8-B1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply monitor IC designed for multivoltage systems requiring tight threshold accuracy and ultralow-voltage reset assertion. It monitors 3.3V, 2.5V, 1.8V, 1.5V, and two adjustable inputs (VADJ1/VADJ2) with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST low output down to VCC = 0.5V. It is used in network servers and optical networking systems for reliable power-on reset and brownout detection.
For engineers reviewing the LTC2908CTS8-B1#TRMPBF datasheet, LTC2908CTS8-B1#TRMPBF pinout, LTC2908CTS8-B1#TRMPBF application, or LTC2908CTS8-B1#TRMPBF equivalent, key selection criteria include its 3.3V/2.5V/1.8V/1.5V fixed thresholds, dual 0.5V-adjustable inputs, open-drain RST with 200ms delay, ±1.5% accuracy over –40°C to 85°C, and TSOT-23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2908CTS8-B1#TRMPBF implements six independent comparators with internal bandgap reference and glitch-immune timing logic. Its reset pulse generator enforces a 200ms delay after all inputs exceed their thresholds before releasing RST, and it features built-in first-order low-pass filtering on each comparator output to suppress transient-induced false triggers.
VCC is auto-selected as the greater of V1 or V2, enabling operation across input combinations without external regulation. The RST output uses a strong NMOS pull-down (typ. 40Ω) and weak 6μA internal pull-up to VCC, supporting wired-OR configurations and external pull-up for faster rise times-critical in systems with multiple supervisors or long trace lengths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Count | Six simultaneous voltage inputs: V1 (3.3V), V2 (2.5V), V3 (1.8V), V4 (1.5V), VADJ1, VADJ2 |
| Threshold Accuracy | ±1.5% over full operating temperature range (–40°C to 85°C), ensuring precise margining in multivoltage systems |
| Reset Timeout | 200ms nominal delay after all inputs stabilize above threshold-eliminates noise-induced resets below 5Hz |
| RST Output Type | Active-low open-drain with guaranteed VOL ≤ 0.15V at VCC = 0.5V and IRST = 5μA-enables reliable reset assertion during deep brownout |
| Supply Range | V1/V2 operate from 0.5V to 6V; internal VCC derived from max(V1,V2)-no external bias required |
| Adjustable Threshold | VADJ1/VADJ2 reference 0.5V with ±8nA input current-supports resistor-divider monitoring of any voltage ≥0.55V |
| Package | 8-lead TSOT-23 (3mm × 1.75mm, 1mm height)-compatible with high-density routing and automated assembly |
Pinout & Package
Package: 8-lead plastic TSOT-23 (ThinSOT™), 3mm × 1.75mm footprint, 1mm profile, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 (Pin 1) | Voltage Input 2 | Monitors 2.5V rail; contributes to internal VCC selection-must be bypassed with ≥0.1μF capacitor |
| V4 (Pin 2) | Voltage Input 4 | Monitors 1.5V rail; high-impedance input draws ≤2μA-suitable for direct connection to DC/DC output |
| RST (Pin 3) | Reset Logic Output | Open-drain active-low output; pulls low when any input falls below threshold and holds for 200ms after recovery |
| GND (Pin 4) | Device Ground | Reference node for all comparators and internal circuitry-requires low-inductance connection to system ground plane |
| V1 (Pin 8) | Voltage Input 1 | Monitors 3.3V rail; primary VCC source when V1 > V2-bypass with ≥0.1μF ceramic capacitor |
| VADJ1 (Pin 7) | Adjustable Input 1 | 0.5V-referenced comparator input; connects to resistor divider for custom trip points (e.g., 12V, 5V, 1.2V) |
| V3 (Pin 6) | Voltage Input 3 | Monitors 1.8V rail; draws ≤2μA quiescent current-minimizes loading on low-noise LDO outputs |
| VADJ2 (Pin 5) | Adjustable Input 2 | Second 0.5V-referenced input; enables independent monitoring of two additional rails without external references |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-voltage reset assertion | Guaranteed RST low output with VCC ≥ 0.5V-ensures deterministic reset during severe brownout conditions |
| Glitch-immune comparator architecture | Integrated first-order low-pass filtering per input-rejects transients <250μs duration without hysteresis penalty |
| Auto-selected internal supply | VCC dynamically sourced from higher of V1 or V2-eliminates need for dedicated supervisor supply rail |
| Wired-OR reset bus support | Open-drain RST with weak internal pull-up-allows multiple LTC2908s to share single system reset line |
| Space-optimized packaging | TSOT-23-8 footprint (3mm × 1.75mm) with 1mm height-reduces board area vs. SOIC-8 by >70% |
Applications
| Network Server Power Sequencing | Optical Transceiver Module Monitoring |
|---|---|
Use Scenario: Monitoring 12V, 3.3V, 2.5V, 1.8V, 1.5V, and 1.2V rails in a 1U rack server with hot-swap controllers and multi-phase VRMs. IC Role / Device Role / Timing Role: Six-input supply monitor providing synchronized power-on reset and brownout detection across CPU, memory, I/O, and management controller domains. Use Value: ±1.5% threshold accuracy ensures reliable reset margining within tight 3.3V ±3% and 1.2V ±5% server rail tolerances-preventing premature boot or lockup. | Use Scenario: Supervising dual 3.3V supplies (laser driver and digital control), 2.5V DAC reference, 1.8V SerDes core, 1.5V analog front-end, and adjustable 1.25V bias in SFP+ modules. IC Role / Device Role / Timing Role: Precision voltage supervisor enforcing 200ms power-stabilization window before enabling laser bias and data path initialization. Use Value: 200ms reset timeout eliminates false triggers from DC/DC startup overshoot and ripple-critical for Class 1 laser safety compliance. |
| Wireless Base Station RF Front-End | Desktop PC Multirail Management |
Use Scenario: Monitoring PA bias (28V via divider), 5V control, 3.3V FPGA, 2.5V ADC, 1.8V DSP, and 1.2V core in massive MIMO active antenna units. IC Role / Device Role / Timing Role: Fault-tolerant supply monitor with adjustable inputs enabling single-chip supervision of high-voltage and low-voltage rails. Use Value: VADJ1/VADJ2 inputs configured for 28V (via 56:1 divider) and 5V (via 10:1 divider) extend monitoring range without external op-amps-reducing BOM count. | Use Scenario: Coordinating power sequencing for CPU VDDIO (1.8V), GPU core (1.2V), chipset 3.3V/2.5V, DDR4 VDDQ (1.2V), and adjustable 5V USB-PD controller in high-end desktop motherboards. IC Role / Device Role / Timing Role: Centralized reset generator asserting system reset only after all 6 critical rails meet tolerance and stability requirements. Use Value: Wired-OR capability allows cascading with secondary LTC2908 for 12-rail monitoring-enabling scalable design across ATX, EATX, and workstation platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V input, no adjustable thresholds, 200ms fixed delay, SOT-23-6 package | Only monitors one rail; lacks multirail coordination and adjustable inputs required for complex systems | Select only when supervising a single 3.3V rail with minimal board space-cannot replace LTC2908CTS8-B1#TRMPBF in multivoltage designs |
| MAX6369KA29+T | Quad input (2.5V/3.3V/adjustable/adjustable), ±2.5% accuracy, 140ms delay, SOT-23-8 package | Lower accuracy and shorter timeout reduce noise immunity; no V1/V2 auto-VCC selection increases supply complexity | Acceptable for cost-sensitive industrial controls where ±2.5% margining is sufficient-but not for telecom or server-grade reliability |
Compared with TPS3808G33DBVR and MAX6369KA29+T, the LTC2908CTS8-B1#TRMPBF delivers superior multirail coordination, tighter ±1.5% accuracy for robust margining, and ultralow-voltage reset assertion critical in brownout-prone infrastructure equipment.
Availability
LTC2908CTS8-B1#TRMPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and wireless base stations requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC2908CTS8-B1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2908 product line was designed specifically for precision multivoltage system supervision in telecom infrastructure, enterprise computing, and high-reliability embedded systems-emphasizing accuracy, low-voltage operation, and noise immunity.
FAQ
What is the guaranteed minimum VCC voltage for reliable RST output operation in LTC2908CTS8-B1#TRMPBF?
The LTC2908CTS8-B1#TRMPBF guarantees correct RST logic state (low output ≤0.15V) with VCC as low as 0.5V. This ultralow-voltage capability ensures deterministic reset assertion during deep brownout events where other supervisors fail-critical for maintaining system integrity in telecom and server power domains.
How does LTC2908CTS8-B1#TRMPBF achieve ±1.5% threshold accuracy over temperature?
The LTC2908CTS8-B1#TRMPBF achieves ±1.5% threshold accuracy using a trimmed bandgap reference and matched comparator input stages with curvature compensation. Electrical characterization across –40°C to 85°C confirms all six thresholds (3.3V, 2.5V, 1.8V, 1.5V, VADJ1, VADJ2) remain within this band-enabling precise system voltage margining without derating.
Can LTC2908CTS8-B1#TRMPBF monitor more than six voltage rails?
Yes-multiple LTC2908CTS8-B1#TRMPBF devices can be connected in wired-OR configuration via their open-drain RST outputs. When any input across any device falls below threshold, the shared RST line asserts low, enabling scalable supervision of 12+, 18+, or N-rail systems without redesigning the reset logic.
What is the purpose of the 200ms reset timeout in LTC2908CTS8-B1#TRMPBF?
The 200ms reset timeout in LTC2908CTS8-B1#TRMPBF prevents false triggering from supply transients and ripple by requiring all six monitored voltages to remain above threshold for a continuous 200ms period before releasing RST. This eliminates noise-induced resets below 5Hz-essential for stable boot in switching-power-supply-based systems.
How are the adjustable inputs VADJ1 and VADJ2 configured in LTC2908CTS8-B1#TRMPBF?
VADJ1 and VADJ2 in LTC2908CTS8-B1#TRMPBF connect to resistor dividers between the target rail and ground, with the noninverting comparator input fixed at 0.5V. Using R2 = 100kΩ, R1 is calculated as R1 = (VTRIP/0.5V − 1) × R2-enabling precise monitoring of rails from 0.55V to 12V with standard 1% resistors.
LTC2908CTS8-B1#TRMPBF 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:
- 6
- Voltage - Threshold:
- 1.403V, 1.683V, 2.338V, 3.086V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2908CTS8-B1#TRMPBF FAQ
1.How can I place an order for LTC2908CTS8-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2908CTS8-B1#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 LTC2908CTS8-B1#TRMPBF reliable?
The price and inventory of LTC2908CTS8-B1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2908CTS8-B1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2908CTS8-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2908CTS8-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2908CTS8-B1#TRMPBF?
LTC2908CTS8-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2908CTS8-B1#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 LTC2908CTS8-B1#TRMPBF?
For technical support, including LTC2908CTS8-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2908CTS8-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2908CTS8-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2908CTS8-B1#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 LTC2908CTS8-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2908CTS8-B1#TRMPBF?
All LTC2908CTS8-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2908CTS8-B1#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 LTC2908CTS8-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2908CTS8-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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