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Renesas ISL8703AIBZ-T
- Part No.:
- ISL8703AIBZ-T
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL8703AIBZ-T.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,750
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Product details
Overview
ISL8703AIBZ-T from Intersil is a quad-channel, delay-adjustable power supply sequencer with under/overvoltage monitoring, operating from 3.3V to 24V input bias. It provides four active-low open-drain ENABLE# outputs (ENABLE#_A through ENABLE#_D), programmable sequencing delays via external resistors (TB/TC/TD), and voltage compliance reporting via FAULT and SEQ_EN pins. It is used in FPGA, DSP, and multi-rail embedded systems requiring precise power-up/down sequencing.
For engineers reviewing the ISL8703AIBZ-T datasheet, ISL8703AIBZ-T pinout, ISL8703AIBZ-T application, or ISL8703AIBZ-T equivalent, key selection criteria include its 14-lead SOIC package, -40°C to +85°C temperature range, 1.21V typical UV/OV threshold, 2.6µA TIME pin current source, and support for daisy-chained sequencing across multiple ICs.
Technical Context
The ISL8703AIBZ-T implements a voltage-monitoring sequencer with dual thresholds: UV rising at 1.21V (±50mV) and OV falling at 1.21V (±50mV), each with 104mV hysteresis. It uses an internal 2.6µA current source on the TIME pin to generate the initial delay before ENABLE#_A assertion, and three independent RC-based timing channels (TB, TC, TD) to control inter-output delays.
It features active-low ENABLE# outputs that track VIN during power-up and assert low upon valid sequencing start; FAULT reports voltage window violations by releasing high (open-drain), while SEQ_EN enables external control of sequence initiation and shutdown order (D→C→B→A off-sequence). All functions operate within the 3.3V–24V nominal bias range and require no external clock or microcontroller.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.3V to 24V nominal bias - powers IC directly from system rail without LDO |
| UV/OV Threshold | 1.21V typical rising/falling - sets ±10% window for 12V monitored rail using 3-resistor divider |
| TIME Pin Current | 2.6µA constant current - charges external capacitor to set 7.7ms to 435ms delay to ENABLE#_A |
| Delay Resolution (TB/TC/TD) | 3.5ms to 240ms per stage - adjustable via 0Ω–120kΩ resistors to ground for fine-grained sequencing control |
| FAULT Response Time | 15–50µs low-to-high, <0.5µs high-to-low - enables fast fault propagation to upstream controllers or supervisors |
| Operating Temperature | -40°C to +85°C - qualified for industrial and embedded applications with no derating required |
| Package | 14-lead SOIC (M14.15) - standard footprint compatible with automated assembly and thermal management up to 110°C/W θJA |
Pinout & Package
ISL8703AIBZ-T is housed in a 14-lead narrow-body SOIC package (M14.15), RoHS-compliant, with 1.27mm pitch and 8.65mm × 3.9mm body dimensions. Thermal resistance θJA is 110°C/W on standard FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: ENABLE#_D | Active-low sequenced output | Final output in A→B→C→D turn-on sequence; pulled low after ENABLE#_C; tracks VIN during ramp-up |
| 2: ENABLE#_C | Active-low sequenced output | Third output; asserted after ENABLE#_B; released high on UV/OV fault |
| 3: ENABLE#_B | Active-low sequenced output | Second output; asserted after ENABLE#_A; supports daisy-chain synchronization |
| 4: ENABLE#_A | Active-low sequenced output | First output; released after TIME capacitor reaches 2.0V; initiates downstream enable chain |
| 5: OV | Voltage monitor input | Overvoltage sense node - pulls all ENABLE# outputs high if voltage >1.21V (rising) |
| 6: UV | Voltage monitor input | Undervoltage sense node - pulls all ENABLE# outputs high if voltage <1.21V (falling) |
| 7: GND | Signal and power ground | Reference for all analog inputs and digital logic; requires low-impedance connection to system ground plane |
| 8: FAULT | Open-drain fault indicator | Releases high (to external pull-up) when UV or OV violation occurs; <0.5µs response to recovery |
| 9: SEQ_EN | Sequence enable input | Active-high signal - must be high or open to initiate auto-start; internally pulled to ~2.4V |
| 10: TIME | Timing capacitor node | 2.6µA current source charges external cap to 2.0V threshold; determines delay to ENABLE#_A |
| 11: TB | Delay timing resistor node | Resistor to GND sets delay from ENABLE#_A to ENABLE#_B (3.5–240ms) |
| 12: TC | Delay timing resistor node | Resistor to GND sets delay from ENABLE#_B to ENABLE#_C (3.5–240ms) |
| 13: TD | Delay timing resistor node | Resistor to GND sets delay from ENABLE#_C to ENABLE#_D (3.5–240ms) |
| 14: VIN | Bias supply input | 3.3V–24V input; requires 1µF ceramic decoupling capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Four active-low sequenced outputs | ENABLE#_A through ENABLE#_D provide deterministic, resistor-programmable turn-on/off order without firmware |
| Adjustable UV/OV monitoring window | Configurable trip points via external 3-resistor divider - supports any monitored rail ≥1.22V |
| Independent on/off sequencing control | SEQ_EN pin triggers both startup and reverse-order shutdown (D→C→B→A), eliminating need for external logic |
| Minimal external BOM | Only 1 capacitor (TIME) and 3 resistors (TB/TC/TD) needed for full 4-stage sequencing - no timing crystals or EEPROM |
| Fault-reporting with fast response | FAULT pin asserts within 15µs of UV/OV violation and recovers in <0.5µs - suitable for real-time safety interlocks |
Applications
| FPGA Power Sequencing | DSP Core + I/O Rail Management |
|---|---|
Use Scenario: Sequencing 12V auxiliary, 3.3V I/O, 1.8V core, and 1.2V PLL rails for Xilinx Artix-7 FPGA during cold start. IC Role / Device Role / Timing Role: ISL8703AIBZ-T acts as autonomous hardware sequencer, enforcing strict voltage ramp order and monitoring VCCINT against 1.14V–1.26V window. Use Value: Prevents configuration latch-up and I/O contention by ensuring core rails stabilize before I/O enable, with <50µs fault detection halting boot on violation. |
Use Scenario: Managing TI C6678 DSP power domains: 1.25V core, 1.8V memory interface, 3.3V peripherals, and 5V analog supply. IC Role / Device Role / Timing Role: ISL8703AIBZ-T coordinates turn-on sequence and monitors 1.25V rail with ±50mV tolerance, asserting FAULT if droop exceeds 62.5mV. Use Value: Eliminates need for FPGA-based sequencing logic; resistor-tuned delays match silicon-specific ramp requirements without software overhead. |
| Industrial PLC Backplane Power Control | Multi-Board Embedded System Startup |
Use Scenario: Controlling power delivery to hot-swappable I/O modules on a 24V backplane with transient immunity. IC Role / Device Role / Timing Role: ISL8703AIBZ-T monitors backplane voltage and sequences module enables with RC-filtered VIN to suppress dv/dt-induced false trips. Use Value: Enables safe hot-insertion via SEQ_EN gating and ensures all modules power up in fixed order, preventing bus contention during initialization. |
Use Scenario: Synchronizing power to CPU board, GPU carrier, and sensor hub in an edge AI gateway with distributed 12V/5V/3.3V supplies. IC Role / Device Role / Timing Role: ISL8703AIBZ-T serves as central sequencer, using daisy-chained FAULT and SEQ_EN signals to coordinate across three boards. Use Value: Reduces BOM count by replacing three discrete supervisors; single 14-pin SOIC replaces multiple discrete timers and comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power sequencing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Integrated PMIC with buck/boost regulators; sequencer is fixed-function, not resistor-programmable | Best for compact, single-board designs needing regulation + sequencing; lacks independent UV/OV monitoring on external rails | Select when combined regulation and sequencing are required, and external rail monitoring is unnecessary |
| MAX16050ATA+ | Quad sequencer with SPI interface and nonvolatile configuration; supports 16-step sequencing vs. 4-step fixed | Suitable for complex, field-upgradable sequencing profiles; requires MCU interaction and adds layout complexity | Select when programmable sequencing depth, event logging, or dynamic reconfiguration is required |
Compared with TPS65023RSBR and MAX16050ATA+, the ISL8703AIBZ-T offers simpler, resistor-based timing without MCU dependency or integrated regulation - ideal for cost-sensitive, hardware-only sequencing where external rail monitoring is critical and sequencing depth is limited to four stages.
Availability
ISL8703AIBZ-T is available at Aetrix Electronics and suitable for FPGA power sequencing, DSP subsystem startup, industrial PLC backplane control, and multi-board embedded system initialization requiring stable component supply and long-term lifecycle support.
Supply support for ISL8703AIBZ-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 semiconductor manufacturer specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.
The ISL8703AIBZ-T belongs to the ISL870XA family of under/overvoltage sequencers, designed specifically for hardware-controlled, multi-rail power sequencing in high-reliability embedded systems without firmware dependency.
FAQ
What is the function of the SEQ_EN pin on the ISL8703AIBZ-T?
The SEQ_EN pin on the ISL8703AIBZ-T is an active-high input that enables external control of sequencing initiation and shutdown. When held high or open, it allows auto-start after voltage compliance; when driven low, it triggers reverse-order shutdown (D→C→B→A). Internally pulled to ~2.4V, it eliminates the need for an external pull-up resistor. This pin is essential for synchronized multi-board sequencing and safe hot-swap operation in the ISL8703AIBZ-T.
How does the ISL8703AIBZ-T monitor overvoltage and undervoltage conditions?
The ISL8703AIBZ-T monitors overvoltage and undervoltage using dedicated OV and UV pins, each with a 1.21V typical threshold and 104mV hysteresis. An external resistor divider scales the monitored rail (e.g., 12V) to match this threshold. If the scaled voltage exceeds 1.21V on OV or falls below 1.21V on UV, all ENABLE# outputs are immediately pulled high and FAULT is released. This analog comparator-based method operates independently of VIN and requires no calibration, making it robust for the ISL8703AIBZ-T in industrial environments.
Can the ISL8703AIBZ-T be used with a 5V-only system?
Yes, the ISL8703AIBZ-T supports 3.3V to 24V nominal bias, so a 5V supply is fully within specification for VIN. Its UV/OV monitoring can be configured for any rail ≥1.22V using an external resistor divider - for example, a 5V rail can be scaled to 1.21V using Ru=332kΩ, Rm=10.2kΩ, Rl=10.0kΩ. The 2.6µA TIME pin current and 3.5–240ms delay range remain fully functional at 5V bias, confirming compatibility with 5V-only systems using the ISL8703AIBZ-T.
What is the maximum delay achievable between ENABLE#_C and ENABLE#_D on the ISL8703AIBZ-T?
The maximum delay between ENABLE#_C and ENABLE#_D on the ISL8703AIBZ-T is 240ms, achieved by connecting a 120kΩ resistor from the TD pin to GND. This value is specified in the Electrical Specifications table under "tdel_120" with TYP 195ms and MAX 240ms. The delay is generated by an internal oscillator/counter driven by the TD resistor, and remains stable across -40°C to +85°C. This timing resolution supports slow-ramping supplies such as linear regulators or isolated DC/DC converters in the ISL8703AIBZ-T application.
Does the ISL8703AIBZ-T require a decoupling capacitor on the VIN pin?
Yes, the ISL8703AIBZ-T requires a 1µF ceramic decoupling capacitor placed as close as possible to the VIN pin (Pin 14), as explicitly stated in the datasheet's Application Recommendations section. This capacitor stabilizes the internal bias regulator and prevents false triggering due to supply transients. Omitting it may cause erratic sequencing behavior or premature FAULT assertion. The requirement applies universally across all operating voltages (3.3V–24V) and is mandatory for reliable operation of the ISL8703AIBZ-T.
ISL8703AIBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Sequencer
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ISL8703AIBZ-T FAQ
1.How can I place an order for ISL8703AIBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8703AIBZ-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 ISL8703AIBZ-T reliable?
The price and inventory of ISL8703AIBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8703AIBZ-T is usually 5 days.
3.What payment methods are accepted for ISL8703AIBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8703AIBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8703AIBZ-T?
ISL8703AIBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8703AIBZ-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 ISL8703AIBZ-T?
For technical support, including ISL8703AIBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8703AIBZ-T requirements.
6.How does Aetrix verify that ISL8703AIBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8703AIBZ-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 ISL8703AIBZ-T meets industry standards.
7.What is the process for return or replacement of ISL8703AIBZ-T?
All ISL8703AIBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8703AIBZ-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 ISL8703AIBZ-T part is unused and in its original packaging.
Return procedure for ISL8703AIBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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