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Analog Devices Inc. LTC1536IS8#PBF
- Part No.:
- LTC1536IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1536IS8#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1536IS8#PBF 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., 1V ±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 - used in motherboard-level PCI RST generation.
For engineers reviewing the LTC1536IS8#PBF datasheet, LTC1536IS8#PBF pinout, LTC1536IS8#PBF application, or LTC1536IS8#PBF equivalent, key selection considerations include PCI tFAIL timing compliance (≤450ns), pushbutton soft-reset pulse width (100µs typ), glitch immunity architecture, VCCA input flexibility for power-good monitoring, and operation down to 1V supply rail.
Technical Context
The LTC1536IS8#PBF implements dual-comparator per supply (VCC3/VCC5) - one high-accuracy slow comparator (±0.75% threshold) for stable brownout detection and one fast comparator offset by 250mV for sub-100ns tPF response to rapid supply collapse - enabling PCI Rev 2.1 tFAIL compliance even when VCC5 drops below VCC3 by 300mV.
Its power-detect gate drive selects between VCC3 and VCC5 to drive the RST output FET, ensuring valid reset state down to 1V on either rail; the PBR input includes 20ms debounce and dual-mode reset generation (100µs soft pulse for <2s press, 200ms hard reset for >2s press), with SRST and RST both open-drain and OR-tie capable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC3 Threshold | 2.985V ±0.75% (ensures reliable 3.3V ±0.3V monitoring with margin against spec drift) |
| VCC5 Threshold | 4.725V ±0.75% (meets PCI 5V ±5% tolerance with tight trip point control) |
| VCCA Threshold | 1.000V ±0.75% (supports logic-level or DC/DC feedback monitoring with high impedance input) |
| Reset Pulse Width | 200ms nominal (guaranteed minimum 140ms across –40°C to 85°C for robust power-up sequencing) |
| Soft Reset Pulse | 100µs typical (enables DRAM-refresh-preserving microprocessor reset without system interruption) |
| tFAIL Response | ≤450ns (meets PCI Rev 2.1 tFAIL spec with margin for downstream logic propagation) |
| Supply Current | 100µA typical (enables use in battery-backed or low-power embedded systems) |
| Operating Temp | –40°C to +85°C (qualified for industrial-grade motherboard and server environments) |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V sense input & IC power supply | Bypassed with ≥0.1µF ceramic capacitor; powers internal circuitry and provides pull-up for open-drain outputs |
| VCC5 (Pin 2) | 5V sense input & RST gate drive source | Used only for RST FET gate drive when VCC5 > VCC3; enables reset assertion even if VCC3 fails first |
| VCCA (Pin 3) | Adjustable threshold input (1V typ) | High-impedance (≤15nA leakage), supports power-good signal or DC/DC feedback monitoring |
| GND (Pin 4) | Ground reference | Common return for all analog comparators and digital logic; requires low-inductance connection |
| PBR (Pin 8) | Pushbutton reset input | Active-low with 7µA internal pull-up to VCC3; debounced (20–35ms) and mode-selects soft/hard reset |
| RST (Pin 5) | Active-high CMOS reset output | Buffered complement of Pin 6; drives high to VCC3; not open-drain |
| RST (Pin 6) | Active-low open-drain reset output | Primary reset output; weak 6µA internal pull-up to VCC3; supports OR-tying with other reset sources |
| SRST (Pin 7) | Active-low open-drain soft reset output | 100µs pulse on PBR release (<2s press); same electrical specs as Pin 6 but functionally isolated |
Key Features
| Feature | Design Value |
|---|---|
| Dual-threshold comparator per supply | Enables simultaneous high-accuracy brownout detection (±0.75%) and ultrafast tFAIL response (≤450ns) |
| Auto-selectable power detect | Gate drive for RST output dynamically chooses VCC3 or VCC5, guaranteeing reset validity down to 1V on either rail |
| Configurable soft/hard reset modes | PBR press duration determines output: <2s → 100µs SRST pulse; >2s → 200ms RST assertion with post-release hold |
| PCI tFAIL/tPF compliance | Fully meets Rev 2.1 timing specs (tFAIL ≤450ns, tPF ≤90ns) with margin for PCB trace delays and logic fanout |
| Glitch-immune architecture | Internal filtering and comparator hysteresis prevent false resets from transient supply noise or ESD events |
| OR-tie capable outputs | Both RST (Pin 6) and SRST (Pin 7) are open-drain with weak VCC3 pull-ups, enabling direct wire-OR with other reset sources |
Applications
| Motherboard PCI RST Generation | PCI Expansion Board RST Generation |
|---|---|
Use Scenario: Generating compliant reset signals on desktop/server motherboards with concurrent 3.3V and 5V rails and PCIe slot power requirements. IC Role / Device Role / Timing Role: Precision triple-supply monitor enforcing PCI tFAIL timing, asserting RST within 450ns of VCC5 or VCC3 undervoltage, and holding reset for 200ms after stabilization. Use Value: Eliminates need for discrete RC timing networks and external comparators while meeting strict PCI Rev 2.1 reset timing and voltage threshold specs. | Use Scenario: Providing localized reset generation on add-in cards (e.g., network, storage, GPU) requiring independent validation of onboard 3.3V/5V supplies before initialization. IC Role / Device Role / Timing Role: Monitors card-specific VCC3/VCC5 and optional VCCA (e.g., auxiliary 1.8V rail), generating synchronized RST with soft-reset capability via front-panel button. Use Value: Enables hot-plug-safe reset behavior and avoids system-level reset propagation delays through backplane signaling. |
| Dual-Supply System with Power-Good Monitoring | Portable Battery-Powered Equipment Reset Control |
Use Scenario: Validating both main 3.3V/5V rails and a "power good" signal (e.g., from PMIC or DC/DC converter) before releasing processor reset in industrial controllers. IC Role / Device Role / Timing Role: Uses VCCA as high-impedance input for external PWR_GOOD assertion, extending reset hold until all three conditions (VCC3 OK, VCC5 OK, PWR_GOOD high) are met. Use Value: Prevents premature boot from partial power-up states, improving system reliability in multi-rail power architectures. | Use Scenario: Managing reset sequencing in notebook or handheld devices where battery voltage sag must trigger controlled shutdown without false triggers from load transients. IC Role / Device Role / Timing Role: Monitors scaled-down VCCA (e.g., 1V threshold tied to battery monitor output) alongside VCC3/VCC5, asserting reset at precise low-battery thresholds with 100µA quiescent current. Use Value: Extends battery life by minimizing supply current while maintaining deterministic low-voltage shutdown behavior. |
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 3.3V/5V/1V thresholds (±0.75%), but no PBR input or soft-reset functionality | Lacks pushbutton interface and SRST output - suitable only for fixed-supply monitoring without manual reset capability | Select when board layout lacks front-panel button routing and only power-fail reset is required |
| TPS3808G33DBVR | Single 3.3V monitor (not triple); 3-pin SOT-23; 3% threshold accuracy vs. LTC1536IS8#PBF's 0.75%; no VCCA or PBR support | Only monitors one rail; cannot replace LTC1536IS8#PBF in PCI systems requiring simultaneous 3.3V/5V/VCCA supervision | Use only as cost-optimized substitute in non-PCI, single-rail applications where timing and accuracy margins allow |
Compared with LTC1326CMS8#PBF, the LTC1536IS8#PBF adds critical PBR-driven soft/hard reset modes and OR-tie capable outputs; versus TPS3808G33DBVR, it delivers triple-rail monitoring, PCI-timed response, and ±0.75% accuracy - making it irreplaceable in compliant PCI designs.
Availability
LTC1536IS8#PBF is available at Aetrix Electronics and suitable for motherboard design, PCI expansion board development, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC1536IS8#PBF 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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1536 series.
The LTC1536IS8#PBF belongs to Linear's precision power monitoring IC family, engineered specifically for PCI-compliant computing platforms requiring simultaneous multi-rail voltage supervision, fast fault response, and robust reset sequencing under brownout and power-fail conditions.
FAQ
What is the operating temperature range for the LTC1536IS8#PBF?
The LTC1536IS8#PBF is rated for industrial operation from –40°C to +85°C, as confirmed by its "I" grade suffix and Absolute Maximum Ratings table. This range ensures reliable performance in server motherboards, network equipment, and industrial controllers where ambient temperatures exceed commercial limits. The LTC1536IS8#PBF maintains ±0.75% threshold accuracy across this full range.
Does the LTC1536IS8#PBF meet PCI Local Bus Specification Rev 2.1 timing requirements?
Yes, the LTC1536IS8#PBF explicitly meets PCI Rev 2.1 tFAIL (≤450ns) and tPF (≤90ns) timing specifications, as documented in the Electrical Characteristics table and Timing Diagrams section. Its dual-comparator architecture ensures guaranteed compliance even under worst-case slew rates and supply collapse conditions - a core design requirement validated during qualification of the LTC1536IS8#PBF.
How does the pushbutton reset (PBR) function work on the LTC1536IS8#PBF?
The PBR pin on the LTC1536IS8#PBF supports two reset modes: a <2-second press generates a 100µs soft reset pulse on SRST (preserving DRAM refresh), while a >2-second press forces RST low for 200ms after release. Internal 20–35ms debounce prevents false triggering, and the 7µA internal pull-up simplifies front-panel integration. This dual-mode behavior is intrinsic to the LTC1536IS8#PBF's architecture.
Can the LTC1536IS8#PBF operate with only one supply rail powered?
Yes, the LTC1536IS8#PBF guarantees correct RST logic state with either VCC3 ≥ 1V or VCC5 ≥ 1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Its auto-selectable gate drive uses whichever rail is present to power the RST output FET - a key feature enabling safe reset assertion during asymmetric power-up/down sequences in the LTC1536IS8#PBF.
What are the key differences between the LTC1536IS8#PBF and LTC1536CS8#PBF?
The LTC1536IS8#PBF is the industrial-grade version (–40°C to +85°C), while the LTC1536CS8#PBF is commercial-grade (0°C to +70°C). Both share identical electrical specifications, pinout, and functionality - the only difference is temperature qualification. The "I" suffix in LTC1536IS8#PBF denotes extended thermal range, critical for deployment in servers, base stations, and ruggedized computing hardware.
LTC1536IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1536IS8#PBF FAQ
1.How can I place an order for LTC1536IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1536IS8#PBF 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 LTC1536IS8#PBF reliable?
The price and inventory of LTC1536IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1536IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1536IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1536IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1536IS8#PBF?
LTC1536IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1536IS8#PBF 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 LTC1536IS8#PBF?
For technical support, including LTC1536IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1536IS8#PBF requirements.
6.How does Aetrix verify that LTC1536IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1536IS8#PBF 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 LTC1536IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1536IS8#PBF?
All LTC1536IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1536IS8#PBF, 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 LTC1536IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1536IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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