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Analog Devices Inc. LTC1536CMS8#TRPBF
- Part No.:
- LTC1536CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1536CMS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,020
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Product details
Overview
LTC1536CMS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC designed for PCI local bus applications, simultaneously monitoring 5V (±5%), 3.3V (±0.3V), and an adjustable input (e.g., 1.000V ±0.75% threshold accuracy), with guaranteed reset assertion for VCC3 ≥ 1V or VCC5 ≥ 1V, internal 200ms reset delay, and active-low/open-drain RST/SRST outputs - deployed in motherboard-level PCI RST generation.
For engineers reviewing the LTC1536CMS8#TRPBF datasheet, LTC1536CMS8#TRPBF pinout, LTC1536CMS8#TRPBF application, or LTC1536CMS8#TRPBF equivalent, key selection criteria include PCI tFAIL timing compliance (≤450ns), glitch immunity, pushbutton soft-reset capability (100µs pulse), dual reset output polarity support, and operation down to 1V supply voltage - critical for robust power sequencing in desktop/notebook computers and network servers.
Technical Context
The LTC1536CMS8#TRPBF implements dual-threshold comparator architecture per supply rail: a high-accuracy slow comparator (±0.75% threshold tolerance) for stable undervoltage detection, and a fast comparator offset 250mV lower to meet PCI tFAIL (≤450ns) and tPF (≤90ns) specifications during rapid supply collapse. It uses VCC3 as primary power source but dynamically selects VCC5 or VCC3 for RST gate drive based on higher potential, ensuring valid reset assertion down to 1V on either rail.
Its pushbutton reset logic includes 20ms debounce, 2-second mode transition threshold (soft vs. hard reset), and independent SRST (100µs open-drain pulse) and RST (200ms open-drain pulse) outputs - both with weak internal 6µA pull-ups to VCC3 and compatible with external pull-up to >VCC3 (e.g., 5V logic). The VCCA input supports high-impedance 1V threshold sensing or "power good" signal monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | Three independent inputs: VCC5 (4.725V typ threshold), VCC3 (2.985V typ), VCCA (1.000V typ) - enables simultaneous validation of PCI 5V/3.3V rails plus auxiliary supply or power-good signal. |
| Threshold Accuracy | ±0.75% over full temperature range - ensures reliable reset assertion without false triggering across industrial (–40°C to 85°C) operation. |
| Reset Pulse Width | RST: 200ms nominal (140–300ms over temp); SRST: 100µs typ (50–200µs) - provides standardized power-on reset and non-disruptive DRAM-preserving soft reset. |
| tFAIL Response Time | ≤450ns (VCC5/VCC3 drop 500mV below threshold at –0.1V/µs) - meets PCI Local Bus Rev 2.1 timing spec with margin for downstream logic delays. |
| Supply Current | 100µA typical (IVCC3), <20nA leakage on VCCA - enables use in battery-backed or ultra-low-power systems without compromising monitoring fidelity. |
| Operating Voltage Range | VCC3/VCC5: 1V to 7V; PBR/RST/SRST: –0.3V to 7V - supports valid reset state assertion even during deep brownout conditions before system shutdown. |
| Output Types | RST: active-high CMOS; RST: active-low open-drain; SRST: active-low open-drain - allows flexible interface to 3.3V/5V logic, OR-tie with other reset sources, and software-controlled reset initiation. |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, RoHS-compliant lead-free finish (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V supply sense input & IC power rail | Primary power source for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor; enables RST assertion when ≥1V. |
| VCC5 (Pin 2) | 5V supply sense input | Used for gate drive of RST output FET when VCC5 > VCC3; ensures early reset assertion during 5V collapse before 3.3V fails. |
| VCCA (Pin 3) | Adjustable threshold input (e.g., 1.000V) | High-impedance input for monitoring auxiliary supplies or "power good" signals; threshold accuracy ±0.75%; can be tied to VCC3/VCC5 if unused. |
| GND (Pin 4) | Ground reference | Common return path for all analog comparators and digital logic; requires low-inductance connection to system ground plane. |
| PBR (Pin 8) | Pushbutton reset input | Active-low with 7µA internal pull-up to VCC3; debounced (20–35ms); triggers 100µs SRST pulse if held <2s, or 200ms RST pulse if held >2s. |
| RST (Pin 5) | Active-high CMOS reset output | Inverted complement of Pin 6 RST; drives high to VCC3; buffered output suitable for direct microprocessor /RESET input. |
| RST (Pin 6) | Active-low open-drain reset output | Main reset output; weak 6µA internal pull-up to VCC3; supports external pull-up to 5V; OR-tie capable with other open-drain reset sources. |
| SRST (Pin 7) | Active-low open-drain soft reset output | Generates 100µs pulse after PBR release (if held <2s); preserves DRAM refresh cycles; monitored by processor for software-initiated reset. |
Key Features
| Feature | Design Value |
|---|---|
| PCI tFAIL/tPF Timing Compliance | Meets Rev 2.1 spec with ≤450ns tFAIL and ≤90ns tPF - enables use in certified PCI expansion boards and motherboards without additional timing margining. |
| Dual-Comparator Architecture | Separate fast (250mV offset) and precision (±0.75%) comparators per rail - delivers both speed for fault response and stability against supply noise/glitches. |
| 1V Minimum Supply Operation | RST guaranteed valid for VCC3 ≥ 1V or VCC5 ≥ 1V - ensures reset integrity during deep brownout, supporting graceful system shutdown in portable equipment. |
| Soft Reset Pulse Generation | 100µs SRST pulse triggered by sub-2s PBR press - resets CPU without disturbing DRAM refresh, enabling firmware-level recovery without data loss. |
| Glitch-Immune Power-Fail Detection | Internal filtering and dual-threshold design reject transients <40ns - prevents spurious resets from switching noise or ESD-induced supply perturbations. |
Applications
| PCI Expansion Board RST Generation | Motherboard-Level Dual Supply Monitoring |
|---|---|
|
Use Scenario: Generating compliant reset signaling for PCIe/PCI add-in cards where 3.3V and 5V rails must be validated before local bus initialization. IC Role / Device Role / Timing Role: Triple-supply monitor enforcing PCI tFAIL timing, asserting RST within 450ns of 5V/3.3V undervoltage, and holding reset for 200ms post-recovery. Use Value: Eliminates need for discrete RC timing networks and external comparators, reducing BOM count while guaranteeing spec-compliant reset behavior. |
Use Scenario: Monitoring main 5V and 3.3V system rails on desktop/notebook motherboards, with VCCA tied to DC/DC converter feedback or power-good signal. IC Role / Device Role / Timing Role: Centralized supply validation IC providing synchronized reset assertion, brownout protection, and pushbutton-initiated soft/hard reset modes. Use Value: Enables single-chip solution for multi-rail sequencing, replacing discrete supervisor ICs and simplifying layout around VRM outputs. |
| Notebook Computer Battery Backup Mode | Network Server Redundant Power Monitoring |
|
Use Scenario: Maintaining valid reset state during AC-to-battery switchover in portable systems, where 3.3V may dip transiently while 5V collapses. IC Role / Device Role / Timing Role: Low-current (100µA) supervisor asserting RST when either VCC3 or VCC5 falls below threshold, with guaranteed operation down to 1V. Use Value: Prevents CPU lockup during power transitions by delivering deterministic reset before supply collapse reaches critical levels. |
Use Scenario: Validating redundant 5V/3.3V power supplies in rack-mounted servers, using VCCA to monitor backup PSU status or OR-ing controller output. IC Role / Device Role / Timing Role: Fault-tolerant supply monitor generating fail-safe reset if primary or secondary rail fails, with glitch immunity against cross-rail coupling. Use Value: Increases system uptime by detecting partial power failures earlier than standard supervisors, enabling proactive failover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1326CMS8#PBF | Same 8-pin MSOP package; identical ±0.75% threshold accuracy; but fixed thresholds (4.725V/3.118V/1.000V) and no PBR input or soft reset functionality. | Lacks pushbutton reset and SRST output - suitable only for passive monitoring, not interactive reset control. | Select LTC1326CMS8#PBF when only supply supervision is needed and manual reset is handled externally. |
| TPS3808G33DBVR | Single 3.3V supervisor (not triple); 0.5% accuracy; 200ms delay; no VCC5/VCCA inputs; SOT-23-6 package - fundamentally different scope and pinout. | Cannot monitor 5V or adjustable rails; no PCI timing compliance; no soft reset - limited to basic 3.3V-only systems. | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where triple monitoring is unnecessary. |
Compared with LTC1536CMS8#TRPBF, LTC1326CMS8#PBF offers identical accuracy and package but omits interactive reset features, while TPS3808G33DBVR reduces functionality to a single-rail supervisor - making LTC1536CMS8#TRPBF the only option supporting PCI-compliant triple-rail monitoring with soft/hard reset duality.
Availability
LTC1536CMS8#TRPBF is available at Aetrix Electronics and suitable for PCI-based systems, desktop/notebook computers, intelligent instruments, and network servers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1536CMS8#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 acquired Linear Technology in 2017; Linear pioneered high-performance analog ICs including precision supervisors, DC/DC controllers, and signal conditioning products.
The LTC1536CMS8#TRPBF belongs to Linear's precision power monitoring product line, engineered specifically for PCI-compliant computing platforms requiring fast, accurate, and glitch-immune multi-rail reset generation with interactive pushbutton control.
FAQ
What is the minimum operating voltage for LTC1536CMS8#TRPBF to assert a valid reset?
The LTC1536CMS8#TRPBF guarantees correct RST logic state for VCC3 ≥ 1V or VCC5 ≥ 1V - meaning it remains fully functional and asserts reset reliably even during deep brownout conditions where supplies drop below nominal levels. This is confirmed in Absolute Maximum Ratings and Electrical Characteristics tables, with VOL specified down to VCC3 = 1V and VCC5 = 0V.
Does LTC1536CMS8#TRPBF support PCI Local Bus Revision 2.1 tFAIL timing requirements?
Yes, the LTC1536CMS8#TRPBF explicitly meets PCI Local Bus Specification Rev 2.1 Section 4.3.2 tFAIL timing, with measured values of ≤450ns (typical 150ns) for VCC5 or VCC3 dropping 500mV below threshold at –0.1V/µs - verified in Electrical Characteristics table (Note 4) and Typical Performance curves (G15).
How does the pushbutton reset function differ between soft and hard reset modes on LTC1536CMS8#TRPBF?
On the LTC1536CMS8#TRPBF, holding PBR low for <2 seconds generates a 100µs SRST pulse (soft reset), preserving DRAM refresh; holding PBR low for >2 seconds forces RST low for 200ms after release (hard reset). This dual-mode behavior is implemented via internal debounce (20–35ms) and timer logic, documented in Timing Diagrams TD01/TD02 and Applications Information section.
Can VCCA input on LTC1536CMS8#TRPBF be used for monitoring a DC/DC converter feedback node?
Yes, the VCCA input on LTC1536CMS8#TRPBF is a high-impedance (leakage <15nA), adjustable-threshold (1.000V ±0.75%) sense pin - ideal for connecting directly to the feedback divider of a DC/DC converter to monitor regulation status or "power good" signaling, as shown in Typical Application TA09 and TA07.
What package type and lead finish does LTC1536CMS8#TRPBF use?
The LTC1536CMS8#TRPBF uses the 8-pin MSOP (MS8) package (3.0mm × 3.0mm, 0.65mm pitch) with lead-free (Pb-free) termination and tape-and-reel packaging (#TRPBF suffix), as specified in Package Description section and Order Information table - compliant with RoHS and JEDEC J-STD-020 moisture sensitivity level 1.
LTC1536CMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.985V, 4.725V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1536CMS8#TRPBF FAQ
1.How can I place an order for LTC1536CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1536CMS8#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 LTC1536CMS8#TRPBF reliable?
The price and inventory of LTC1536CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1536CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1536CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1536CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1536CMS8#TRPBF?
LTC1536CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1536CMS8#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 LTC1536CMS8#TRPBF?
For technical support, including LTC1536CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1536CMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1536CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1536CMS8#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 LTC1536CMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1536CMS8#TRPBF?
All LTC1536CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1536CMS8#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 LTC1536CMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1536CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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