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Renesas ISL6536IB-T
- Part No.:
- ISL6536IB-T
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6536IB-T.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,113
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Product details
Overview
ISL6536IB-T from Intersil is a four-channel voltage supervisory IC that monitors up to four positive supply rails >0.7V using external resistor dividers and an internal 0.63V reference. It features open-drain PGOOD output with guaranteed validity down to VDD <1V, 30µs glitch immunity on all VMON inputs, and ENABLE-controlled reset. It is used in graphics cards and multi-rail DSP/processor power systems.
For engineers reviewing the ISL6536IB-T datasheet, ISL6536IB-T pinout, ISL6536IB-T application, or ISL6536IB-T equivalent, key selection criteria include independent VMON threshold adjustability, PGOOD delay timing (≤2µs), low-VDD operation (2.7–4V), and SOIC-8 compatibility for space-constrained PCB layouts.
Technical Context
The ISL6536IB-T implements a Boolean AND logic function across four independently programmable undervoltage monitor inputs (VMON1–VMON4), each compared to a stable 0.63V internal reference with ±10mV hysteresis and 100µV/°C temperature coefficient. Its PGOOD output releases only when all four monitored rails exceed their respective thresholds.
It incorporates a 30µs hardware glitch filter per VMON input, supports EN-controlled asynchronous reset with 0.4–0.6×VDD rising threshold and 65mV hysteresis, and maintains PGOOD validity during VDD decay down to 1V - critical for orderly system shutdown sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 2.7V to 4.0V - defines minimum bias voltage required for full supervisory functionality and PGOOD assertion. |
| VMON Threshold | 0.633V (typ) ±10mV hysteresis - sets precise undervoltage detection point referenced to internal bandgap. |
| PGOOD Delay | 2µs max from last VMON rising edge - ensures rapid power-good signaling after rail stabilization. |
| Glitch Immunity | 30µs filter on all VMON inputs - rejects short transients without false PGOOD deassertion. |
| ENABLE Threshold | 0.4VDD to 0.6VDD with 65mV hysteresis - enables robust noise-immune reset control via push-button or logic signal. |
| PGOOD Output | Open-drain with internal 20kΩ pull-up to VDD - allows wired-OR of multiple supervisors and flexible logic-level interfacing. |
| Operating Temp | −40°C to +85°C - qualified for industrial and embedded computing environments. |
Pinout & Package
ISL6536IB-T is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, pkg drawing M8.15), RoHS-compliant with matte tin (e3) termination and 108°C/W θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Bias supply input | Provides operating power (2.7–4V); powers internal reference, comparators, and EN pull-up. |
| 2 PGOOD | Power-good status output | Open-drain output asserting high only when all four VMON inputs exceed threshold; requires external pull-up if interfacing to non-VDD logic. |
| 3 ENABLE | Supervisory enable/reset input | Active-high enable with internal 10µA pull-up to VDD; pulling below 0.5V forces PGOOD low regardless of VMON states. |
| 4 GND | Ground reference | Common return path for VDD, VMON inputs, and internal circuitry; must be low-impedance connection. |
| 5–8 VMON1–VMON4 | Monitor input channels | Four independent analog inputs comparing divided-down rail voltages to 0.63V reference; each includes 30µs glitch filter. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent VMON inputs | Enables simultaneous monitoring of CPU core, I/O, memory, and auxiliary rails without external multiplexing or additional ICs. |
| Guaranteed PGOOD validity to VDD <1V | Ensures reliable power-fail signaling during brown-out or controlled shutdown, supporting safe state retention in microprocessors. |
| 30µs hardware glitch immunity | Eliminates need for external RC filtering on VMON lines, reducing BOM count and layout area in noisy power environments. |
| Internal 20kΩ PGOOD pull-up | Removes requirement for external pull-up resistor in standard VDD-referenced logic interfaces, simplifying schematic design. |
| Programmable UVLO thresholds | Allows precise rail-specific undervoltage detection (e.g., 1.2V ±1%, 3.3V ±2%) using two-resistor dividers per VMON pin. |
Applications
| Graphics Card Power Monitoring | Multi-Rail DSP/Processor Systems |
|---|---|
Use Scenario: Real-time supervision of GPU core, memory, and auxiliary voltages in discrete graphics cards under dynamic load switching. IC Role / Device Role / Timing Role: Four-channel voltage supervisor asserting PGOOD only when all rails stabilize above defined thresholds post-power-on. Use Value: Prevents GPU firmware initialization until all power domains meet specification, eliminating boot failures caused by marginal rail sequencing. |
Use Scenario: Coordinated power validation for heterogeneous SoC subsystems (core, I/O, PLL, DDR) in telecom baseband processors. IC Role / Device Role / Timing Role: Centralized PGOOD generator with sub-2µs response to any rail collapse, enabling fast fault propagation to system controller. Use Value: Reduces need for discrete supervisors per rail, cutting component count and PCB area while maintaining deterministic fault detection latency. |
| Embedded Control System Startup | Medical Instrument Power Sequencing |
Use Scenario: Ensuring clean startup of ARM-based industrial controllers where FPGA, MCU, and analog front-end supplies must be validated before firmware execution. IC Role / Device Role / Timing Role: Supervisory gatekeeper releasing PGOOD only after all four rails exceed user-defined thresholds with hysteresis. Use Value: Guarantees deterministic boot sequence without software polling, improving system reliability in unattended operation. |
Use Scenario: Validating isolated DC-DC outputs powering analog sensor interfaces, digital processing, and display subsystems in portable ultrasound devices. IC Role / Device Role / Timing Role: Fault-tolerant monitor with 30µs glitch rejection preventing false PGOOD toggling during EMI-rich clinical environments. Use Value: Meets IEC 60601-1 requirements for power integrity assurance without adding redundant supervision layers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar four-channel voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3307-33D | Fixed 3.3V VDD bias; three VMON inputs (not four); no internal PGOOD pull-up; higher VDD min = 3V. | Suitable for simpler 3.3V-only systems with ≤3 rails; lacks flexibility for mixed-voltage or ultra-low-VDD (<3V) designs. | Select when cost-sensitive 3-rail monitoring suffices and VDD ≥3V is guaranteed. |
| MAX6816ESE+ | Quad VMON but with fixed 1.25V reference; no ENABLE pin; PGOOD valid only down to VDD = 2.7V (not <1V). | Applicable in legacy 5V systems with stable bias; unsuitable for low-VDD brown-out detection or EN-synchronized reset. | Choose only for retrofits where reference voltage and reset control constraints match existing design. |
Compared with TPS3307-33D and MAX6816ESE+, the ISL6536IB-T uniquely supports four fully independent rails, operates down to 2.7V VDD, guarantees PGOOD validity below 1V, and integrates ENABLE control - making it optimal for modern multi-voltage embedded systems requiring robust, low-threshold power sequencing.
Availability
ISL6536IB-T is available at Aetrix Electronics and suitable for graphics cards, multi-voltage DSP/processor systems, and embedded control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6536IB-T 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
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.
The ISL6536IB-T belongs to Intersil's supervisory IC product line, designed specifically for reliable multi-rail power validation in high-density computing and embedded platforms where sequencing accuracy and fault response speed are critical.
FAQ
What is the minimum VDD voltage required for ISL6536IB-T to assert PGOOD?
The ISL6536IB-T requires VDD ≥2.6V to release PGOOD after power-on. However, once asserted, PGOOD remains valid even as VDD falls to 1V - enabling reliable brown-out detection. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Specifications sections of the FN9114 datasheet, where VDD_L2H is specified at 2.6V and PGOOD output low voltage is tested at VDD = 1V.
Can ISL6536IB-T monitor a 12V rail directly?
No - the ISL6536IB-T VMON inputs accept only voltages referenced to its internal 0.63V threshold and must be scaled using external resistor dividers. For a 12V rail, a divider (e.g., 18.2kΩ + 1kΩ) reduces the voltage to ~0.63V at the VMON pin. The datasheet explicitly states "any positive voltage can be supervised using an external resistor divider," and absolute maximum VMON rating is VDD+0.3V, confirming indirect monitoring is required.
Does ISL6536IB-T require an external pull-up resistor on PGOOD?
No - the ISL6536IB-T includes an internal 20kΩ pull-up resistor from PGOOD to VDD, as stated in the Pin Descriptions and Electrical Specifications tables. This eliminates the need for an external pull-up in most VDD-referenced logic interfaces. However, if interfacing to a different voltage domain (e.g., 1.8V logic), an external pull-up to that rail is necessary since the internal pull-up connects only to VDD.
How does the ENABLE pin affect PGOOD behavior in ISL6536IB-T?
Pulling ENABLE below 0.5V forces PGOOD low immediately, overriding all VMON conditions - this provides hardware reset capability. ENABLE has a 10µA internal pull-up to VDD, allowing direct connection to ground via push-button or logic-low signals. The datasheet specifies tPGdelENF ≤15ns, confirming sub-microsecond reset response, making ISL6536IB-T suitable for systems requiring fast, synchronous power-fail recovery.
What is the temperature coefficient of the VMON threshold in ISL6536IB-T?
The VMON threshold exhibits a temperature coefficient of 100µV/°C (3.3VMON_TC in Electrical Specifications), measured across −40°C to +85°C. This drift is referenced to the nominal 0.633V threshold and is consistent across all four VMON inputs. The datasheet confirms this value applies to the 3.3V-biased condition, and the hysteresis (10mV) helps mitigate functional impact of thermal drift in real-world applications.
ISL6536IB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISL6536IB-T FAQ
1.How can I place an order for ISL6536IB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6536IB-T 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 ISL6536IB-T reliable?
The price and inventory of ISL6536IB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6536IB-T is usually 5 days.
3.What payment methods are accepted for ISL6536IB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6536IB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6536IB-T?
ISL6536IB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6536IB-T 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 ISL6536IB-T?
For technical support, including ISL6536IB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6536IB-T requirements.
6.How does Aetrix verify that ISL6536IB-T is sourced from the original manufacturer or authorized distributors?
All ISL6536IB-T 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 ISL6536IB-T meets industry standards.
7.What is the process for return or replacement of ISL6536IB-T?
All ISL6536IB-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6536IB-T, 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 ISL6536IB-T part is unused and in its original packaging.
Return procedure for ISL6536IB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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