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Analog Devices Inc. LTC1536IS8#TRPBF
- Part No.:
- LTC1536IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1536IS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
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Product details
Overview
LTC1536IS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC designed for PCI local bus applications. It simultaneously monitors 5V (±5%), 3.3V (±0.3V), and an adjustable input (e.g., 1.000V ±0.75% threshold accuracy), delivers active-high and active-low open-drain reset outputs, and guarantees correct RST state down to VCC3 ≥ 1V or VCC5 ≥ 1V - enabling reliable power-on, brownout, and fast-fail reset generation in desktop and notebook motherboards.
For engineers reviewing the LTC1536IS8#TRPBF datasheet, LTC1536IS8#TRPBF pinout, LTC1536IS8#TRPBF application, or LTC1536IS8#TRPBF equivalent, key selection considerations include guaranteed PCI tFAIL compliance (≤450 ns), 200ms internal reset delay, manual pushbutton soft-reset capability (100µs pulse), low 100µA supply current, and operation across –40°C to +85°C industrial temperature range.
Technical Context
The LTC1536IS8#TRPBF integrates dual-threshold comparator pairs per supply rail: a high-accuracy slow comparator (±0.75% threshold tolerance) for stable undervoltage detection, and a faster comparator offset by 250mV for sub-100ns response to rapid supply collapse - meeting PCI Rev 2.1 tFAIL and tPF timing requirements. Its gate drive circuitry auto-selects between VCC3 and VCC5 to ensure RST remains valid even when only one supply reaches 1V.
It features three independent sense inputs (VCC5, VCC3, VCCA), two reset outputs (RST active-high CMOS, RST active-low open-drain), a soft-reset output (SRST, open-drain), and a debounced pushbutton input (PBR) with 20ms debounce and mode-switching at ~2 seconds. All outputs are specified for operation with external pull-ups to VCC3 or higher voltages (e.g., 5V logic).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | VCC5 (4.725V threshold), VCC3 (2.985V threshold), VCCA (1.000V threshold), all ±0.75% over full temperature range |
| Reset Pulse Width | 200ms nominal hard reset; ensures sufficient hold time for CPU initialization and memory stabilization |
| Soft Reset Pulse Width | 100µs typical; enables DRAM-refresh-preserving "soft" reset without system reboot |
| tFAIL Response Time | ≤450ns (PCI Rev 2.1 compliant); asserts RST within nanoseconds when VCC5 drops below 4.25V or VCC3 below 2.5V |
| Supply Current | 100µA typical at VCC3; enables use in battery-backed or ultra-low-power embedded systems |
| Operating Temperature | –40°C to +85°C (I-grade); qualified for industrial motherboard and server environments |
| Package | 8-pin MSOP (MS8); 3.0mm × 3.0mm footprint, 0.65mm pitch, RoHS-compliant lead-free (#TRPBF) |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm lead pitch, exposed pad not present. Thermal resistance θJA = 160°C/W. Compatible with standard reflow profiles for lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V supply sense input & IC power rail | Powers internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor; RST output referenced to this rail |
| VCC5 (Pin 2) | 5V supply sense input & auxiliary gate drive source | Enables RST FET drive when VCC5 > VCC3; supports robust reset assertion during 5V-first or mixed-rail power sequencing |
| VCCA (Pin 3) | Adjustable threshold sense input | High-impedance 1.000V comparator input; usable for "power good" monitoring or DC/DC feedback voltage sensing |
| GND (Pin 4) | Analog and digital ground reference | Common return for all internal comparators, timers, and output drivers; requires low-impedance PCB connection |
| PBR (Pin 8) | Pushbutton reset input | Active-low, internally pulled up to VCC3 (7µA); debounced (20–35ms); triggers soft reset if held <2s, hard reset if held >2s |
| RST (Pin 5) | Active-high CMOS reset output | Drives high to VCC3; buffered complement of Pin 6; compatible with 3.3V logic families |
| RST (Pin 6) | Active-low open-drain reset output | Open-drain with 6µA weak pull-up to VCC3; supports OR-tie with other reset sources and 5V-tolerant pull-ups |
| SRST (Pin 7) | Active-low open-drain soft reset output | 100µs pulse after PBR release (<2s press); enables software-controlled or non-disruptive processor reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual-threshold comparator architecture | Combines ±0.75% accurate slow comparator with 250mV-lower fast comparator to meet PCI tFAIL while rejecting supply glitches |
| Auto-selectable VCC rail gating | Ensures RST remains asserted and valid even when only VCC3 ≥ 1V or VCC5 ≥ 1V - critical for partial-power brownout recovery |
| Programmable reset mode via PBR timing | Single pushbutton input delivers either 100µs soft reset (DRAM-safe) or 200ms hard reset (full power-cycle equivalent) based on press duration |
| PCI Rev 2.1 tFAIL/tPF compliance | Guaranteed ≤450ns tFAIL and ≤90ns tPF response ensures compatibility with PCI Local Bus timing budgets without external acceleration |
| Glitch-immune power-fail detection | Validates supply collapse only after sustained undervoltage (not transient dips), preventing false resets during load transients or noise events |
Applications
| Desktop Motherboard PCI RST Generation | Notebook System Dual-Supply Monitoring |
|---|---|
Use Scenario: Generating compliant PCI reset signal during AC power-up, brownout, or 5V/3.3V rail collapse on ATX desktop motherboards. IC Role / Device Role / Timing Role: Triple-supply monitor asserting RST within ≤450ns (tFAIL) when VCC5 falls below 4.25V or VCC3 below 2.5V; holds reset for 200ms post-recovery. Use Value: Ensures PCI devices initialize synchronously and avoid enumeration errors caused by marginal or collapsing supplies. |
Use Scenario: Monitoring both 5V and 3.3V rails plus VCCA (e.g., "power good" from VRM) in space-constrained notebook platforms. IC Role / Device Role / Timing Role: Simultaneous threshold detection with ±0.75% accuracy; guarantees RST validity down to VCC3 ≥ 1V for graceful shutdown during battery-only operation. Use Value: Enables deterministic system reset behavior during dynamic power-state transitions (S0ix, S3) without external supervision. |
| Intelligent Instrument Power Sequencing | Network Server Board Management |
Use Scenario: Coordinating power-up sequence of FPGA, ADC, and communication ICs requiring precise 3.3V/5V readiness confirmation before initialization. IC Role / Device Role / Timing Role: Uses VCCA as adjustable threshold input to monitor auxiliary 1.8V or 2.5V rails; provides synchronized RST release after all rails stabilize for ≥200ms. Use Value: Eliminates need for discrete RC timers or microcontroller-based sequencing, reducing BOM count and firmware complexity. |
Use Scenario: Providing fail-safe reset signaling to BMC (Baseboard Management Controller) during PSU failure or hot-swap events in 1U/2U servers. IC Role / Device Role / Timing Role: OR-tying SRST/RST outputs with other reset sources (e.g., thermal shutdown, watchdog); supports 5V-tolerant pull-ups for BMC interface compatibility. Use Value: Delivers sub-microsecond fault response and deterministic reset hold time - critical for IPMI-compliant fault containment and recovery. |
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#TRPBF | Same 3-input architecture but with fixed thresholds (4.725V/3.118V/1.000V); 1.5µA quiescent current; no PBR or soft-reset functionality | Lacks pushbutton interface and fast-PCI timing; suited for micropower, non-PCI systems where manual reset is unnecessary | Select LTC1326 when ultra-low power (<2µA) is critical and PCI tFAIL compliance is not required. |
| TPS3808G33DBVR | Single 3.3V supervisor (not triple); 350ms reset timeout; no VCC5/VCCA inputs; 1.8µA IQ; supports enable input | Cannot monitor 5V or adjustable rails; requires additional supervisors for multi-rail systems; no soft-reset or PCI timing support | Use TPS3808G33 only for dedicated 3.3V monitoring where cost and size outweigh multi-rail capability needs. |
Compared with LTC1326CMS8#TRPBF and TPS3808G33DBVR, the LTC1536IS8#TRPBF uniquely delivers PCI-compliant fast-fail response, integrated pushbutton soft/hard reset modes, and true triple-supply monitoring in a single 8-pin MSOP - making it irreplaceable for compact, standards-compliant motherboard designs.
Availability
LTC1536IS8#TRPBF is available at Aetrix Electronics and suitable for desktop motherboards, notebook power management, intelligent instrumentation, network server board management, and PCI expansion board designs requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1536IS8#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 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC portfolio.
The LTC1536 belongs to Linear's precision power monitoring IC family, engineered specifically for PCI-compliant computing platforms requiring simultaneous multi-rail supervision, nanosecond-fast fault response, and pushbutton-initiated soft/hard reset differentiation.
FAQ
What is the operating temperature range for the LTC1536IS8#TRPBF?
The LTC1536IS8#TRPBF is rated for –40°C to +85°C (industrial grade), as confirmed by its "I" suffix and electrical specifications tested across that full range. This makes the LTC1536IS8#TRPBF suitable for deployment in demanding environments such as network servers, industrial PCs, and automotive-adjacent computing modules where ambient temperatures exceed commercial limits.
Does the LTC1536IS8#TRPBF support PCI Local Bus Specification Rev 2.1 tFAIL timing?
Yes - the LTC1536IS8#TRPBF guarantees tFAIL ≤ 450ns (and tPF ≤ 90ns) under defined test conditions, fully complying with PCI Local Bus Specification Rev 2.1 Section 4.3.2. This is achieved via its dual-comparator architecture and is explicitly validated in the datasheet's Electrical Characteristics table and Typical Performance curves (Figures G14–G15). The LTC1536IS8#TRPBF meets this spec without external components.
How does the pushbutton reset (PBR) function differ between soft and hard reset modes on the LTC1536IS8#TRPBF?
On the LTC1536IS8#TRPBF, holding PBR low for less than ~2 seconds triggers a 100µs SRST pulse (soft reset), preserving DRAM refresh; holding PBR low for more than ~2 seconds forces RST low for 200ms after release (hard reset). The internal debounce timer (20–35ms) prevents contact bounce from causing spurious resets. This dual-mode behavior is intrinsic to the LTC1536IS8#TRPBF's design and requires no external logic.
Can the LTC1536IS8#TRPBF monitor supplies other than 5V and 3.3V?
Yes - the VCCA pin on the LTC1536IS8#TRPBF is a high-impedance input with a factory-trimmed 1.000V threshold (±0.75%), but it can also monitor any adjustable voltage via external resistor dividers. For example, tying VCCA to the feedback node of a DC/DC converter allows tracking of 1.2V, 1.8V, or 2.5V rails. This flexibility is documented in LTC1536IS8#TRPBF Typical Application TA09 and TA07.
What package type and lead finish does the LTC1536IS8#TRPBF use?
The LTC1536IS8#TRPBF uses the 8-lead MSOP (MS8) package - 3.0mm × 3.0mm body, 0.65mm lead pitch - with lead-free (Pb-free) terminations and tape-and-reel packaging (#TRPBF suffix). Its part marking is "LTBV", and it is RoHS-compliant per Analog Devices' lead-free policy. Thermal performance is characterized with θJA = 160°C/W.
LTC1536IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1536IS8#TRPBF FAQ
1.How can I place an order for LTC1536IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1536IS8#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 LTC1536IS8#TRPBF reliable?
The price and inventory of LTC1536IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1536IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1536IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1536IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1536IS8#TRPBF?
LTC1536IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1536IS8#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 LTC1536IS8#TRPBF?
For technical support, including LTC1536IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1536IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1536IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1536IS8#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 LTC1536IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1536IS8#TRPBF?
All LTC1536IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1536IS8#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 LTC1536IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1536IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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