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Renesas ISL88813IB846Z
- Part No.:
- ISL88813IB846Z
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88813IB846Z.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
ISL88813IB846Z from Renesas (formerly Intersil) is a microprocessor supervisor IC with fixed 4.64V VDD reset threshold, dual active-high/active-low reset outputs (RST/RST), watchdog timer (1.6s timeout), and auxiliary power-fail monitor (PFI/PFO). It operates from 2.0V to 5.5V, draws ≤10µA at 3V, and asserts reset down to VDD = 1V - used in portable systems for reliable power-up sequencing and brownout protection.
For engineers reviewing the ISL88813IB846Z datasheet, ISL88813IB846Z pinout, ISL88813IB846Z application, or ISL88813IB846Z equivalent, key selection considerations include its ±1.8% voltage threshold accuracy, 140ms minimum reset pulse width, immunity to supply transients, low-power operation, and dual-reset output architecture enabling flexible system-level reset control.
Technical Context
The ISL88813IB846Z integrates a precision bandgap reference, POR circuit with 200ms nominal delay, hysteresis-enhanced VDD monitoring (4.64V trip point), and independent 1.25V PFI comparator. Its watchdog timer clears on WDI edge transitions and asserts WDO low upon timeout or VDD undervoltage.
Unlike ISL88707/ISL88708, it lacks CPOR pin and adjustable tPOR; unlike ISL88705/ISL88706, it provides both RST and RST outputs. It shares identical pinout, package, and core supervision functions with ISL88716, differing only in reset output configuration and internal logic mapping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 4.64V ±1.8% - ensures reliable reset assertion during 5V rail brownout without false triggering. |
| Supply Current | ≤10µA at 3V - enables multi-year battery life in portable equipment with continuous supervision. |
| Reset Pulse Width | ≥140ms - guarantees sufficient hold time for microprocessor initialization and FPGA configuration loading. |
| Watchdog Timeout | 1.6s typical - provides robust software hang detection without excessive system latency. |
| PFI Threshold | 1.25V ±50mV - supports external resistor divider for custom voltage monitoring (e.g., 12V UV detection). |
| Operating Range | -40°C to +85°C - validated for industrial temperature environments without derating. |
| Reset Validity | Down to VDD = 1V - maintains functional reset signaling even during deep undervoltage conditions. |
Pinout & Package
ISL88813IB846Z is housed in an 8-lead SOIC package (JEDEC MS-012-AA, M8.15 outline), RoHS-compliant, with 1.27mm lead pitch and 4.9mm × 3.9mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low debounced input with 20kΩ internal pull-up; triggers reset when pulled below 0.8V for ≥550ns. |
| 2 VDD | Power Supply Input | Main supply rail monitored for 4.64V threshold; reset asserted if VDD drops below trip point or during power-up. |
| 3 GND | Ground Reference | Common return path for all internal comparators, reference, and output drivers. |
| 4 PFI | Auxiliary Voltage Input | Monitors external voltage against 1.25V internal reference; drives PFO high when input >1.25V. |
| 5 PFO | Power-Fail Output | Open-drain output indicating PFI status; low when PFI <1.25V - used for low-battery warning or OV/UV flagging. |
| 6 RST | Active-Low Reset Output | PMOS open-drain output pulled low during reset; requires external pull-up for logic-level compatibility. |
| 7 RST | Active-High Reset Output | Push-pull output driven high to VDD during reset - eliminates need for external pull-up in many MCU interfaces. |
| 8 WDO | Watchdog Output | Open-drain output pulled low on watchdog timeout or VDD undervoltage; no minimum pulse width guarantee. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | RST (active-low) and RST (active-high) enable direct interface with diverse MCU reset inputs without level-shifting. |
| Ultra-Low Quiescent Current | 10µA max at 3V allows integration into always-on battery-backed subsystems without significant drain. |
| Immunity to Supply Transients | Hysteresis (46mV at 4.64V) and internal filtering prevent spurious resets from switching noise or brief droops. |
| Power-Fail Detection | 1.25V PFI threshold with ±50mV tolerance supports accurate low-battery warning or auxiliary rail monitoring. |
| Reset Validity at Low VDD | Asserts valid reset signals down to VDD = 1V - critical for graceful shutdown in deep brownout scenarios. |
Applications
| Portable Power Management | Notebook System Supervision |
|---|---|
Use Scenario: Battery-powered handheld device requiring reliable startup and brownout recovery. IC Role / Device Role / Timing Role: Monitors main 5V rail and battery voltage; asserts reset on undervoltage and generates early low-battery warning via PFO. Use Value: Prevents corrupted firmware execution during weak battery conditions and extends usable runtime by enabling controlled sleep entry before shutdown. | Use Scenario: Notebook motherboard ensuring stable CPU and chipset initialization after AC adapter connection or battery insertion. IC Role / Device Role / Timing Role: Provides synchronized power-on reset with 200ms delay, monitors 3.3V/5V rails, and flags auxiliary power failures via PFI/PFO. Use Value: Eliminates need for discrete RC reset circuits, reduces BOM count, and improves boot reliability across varying input sources. |
| Industrial Controller Monitoring | DSP-Based Communication Module |
Use Scenario: Programmable logic controller operating in harsh environments with fluctuating 24V DC input. IC Role / Device Role / Timing Role: Uses resistor divider on PFI to monitor 24V rail for undervoltage; asserts RST/RST to halt I/O operations during fault. Use Value: Enables deterministic fault response within 200ms, preventing erroneous actuator commands during power instability. | Use Scenario: Cellular baseband module where DSP must initialize before RF subsystem activation. IC Role / Device Role / Timing Role: Generates precise reset timing and watchdog supervision; RST connects to DSP reset pin, WDO feeds back to WDI for software liveliness check. Use Value: Guarantees DSP completes boot sequence before RF calibration begins, avoiding signal integrity issues from premature clock enable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL88716IB846Z | Identical pinout, package, VDD threshold (4.64V), and PFI/PFO functionality; differs only in internal logic - provides RST/RST like ISL88813IB846Z but with same watchdog behavior. | No functional difference in reset generation or supervision timing; fully interchangeable in designs using dual-reset outputs. | Select ISL88716IB846Z if sourcing constraints require alternate part number with identical electrical and mechanical behavior. |
| TPS3808G33DBVR | Fixed 3.3V VDD threshold (not 4.64V); 350ms min reset pulse; 1.8µA quiescent current; no PFI/PFO or dual-reset outputs. | Suitable only for 3.3V systems requiring ultra-low power; cannot replace ISL88813IB846Z in 5V supervision or power-fail detection roles. | Choose only for new 3.3V designs prioritizing sub-2µA current; not a drop-in replacement due to voltage threshold and feature mismatch. |
Compared with ISL88716IB846Z, ISL88813IB846Z offers identical supervision performance and pin compatibility, while TPS3808G33DBVR serves a different voltage class and lacks auxiliary monitoring - making ISL88716IB846Z the only functionally aligned alternative.
Availability
ISL88813IB846Z is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, and notebook computing systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL88813IB846Z 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
Renesas Electronics Corporation (acquired Intersil in 2017) is a global leader in microcontrollers, analog, power management, and SoC solutions for industrial, automotive, and infrastructure markets.
The ISL88813IB846Z belongs to Renesas' legacy Intersil microprocessor supervisor family, designed specifically for cost-sensitive, low-power embedded systems requiring precise voltage monitoring, watchdog safety, and dual-output flexibility in compact SOIC packaging.
FAQ
What is the reset threshold voltage of the ISL88813IB846Z?
The ISL88813IB846Z has a factory-programmed VDD reset threshold of 4.64V with ±1.8% accuracy over temperature. This value is encoded in the part number suffix "46Z" and is verified across -40°C to +85°C. The device asserts reset whenever VDD falls below this threshold or during power-up until VDD exceeds it for the POR delay period. The ISL88813IB846Z does not support user-adjustable thresholds.
Does the ISL88813IB846Z support adjustable power-on reset delay?
No, the ISL88813IB846Z does not support adjustable power-on reset delay. Unlike ISL88707/ISL88708 variants, it lacks the CPOR pin required for external capacitor-based tPOR extension. Its POR timeout is fixed at 200ms (min 140ms, max 260ms). The ISL88813IB846Z delivers consistent, unmodified reset timing ideal for systems requiring deterministic startup behavior without layout-dependent tuning.
How does the watchdog timer function in the ISL88813IB846Z?
The ISL88813IB846Z watchdog timer has a nominal 1.6s timeout period. It clears on any rising or falling edge at the WDI pin and asserts WDO low if no edge occurs within that window. WDO remains low until cleared by WDI toggle or VDD recovery. Unlike the reset outputs, WDO has no minimum pulse width and transitions immediately when VDD rises above threshold. The ISL88813IB846Z watchdog operates independently of the main reset circuitry.
Can the ISL88813IB846Z monitor voltages other than VDD?
Yes, the ISL88813IB846Z includes a dedicated PFI (Power-Fail Input) pin with a fixed 1.25V internal reference. By connecting an external resistor divider to PFI, designers can monitor auxiliary voltages such as 12V, 3.3V, or battery levels. When the divided voltage drops below 1.25V, PFO goes low - enabling low-battery warnings, presence detection, or secondary rail supervision. The ISL88813IB846Z supports this function without additional components beyond the divider network.
What are the key differences between ISL88813IB846Z and ISL88705IB846Z?
The ISL88813IB846Z provides both active-high (RST) and active-low (RST) reset outputs, while ISL88705IB846Z offers only RST. Both share identical VDD threshold (4.64V), PFI/PFO functionality, watchdog timer, and SOIC-8 package. The ISL88813IB846Z's dual-output capability eliminates external inverters in systems requiring both reset polarities - a key differentiator for mixed-signal or legacy MCU interfaces where ISL88705IB846Z would require additional logic.
ISL88813IB846Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.64V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISL88813IB846Z FAQ
1.How can I place an order for ISL88813IB846Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88813IB846Z 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 ISL88813IB846Z reliable?
The price and inventory of ISL88813IB846Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88813IB846Z is usually 5 days.
3.What payment methods are accepted for ISL88813IB846Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88813IB846Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88813IB846Z?
ISL88813IB846Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88813IB846Z 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 ISL88813IB846Z?
For technical support, including ISL88813IB846Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88813IB846Z requirements.
6.How does Aetrix verify that ISL88813IB846Z is sourced from the original manufacturer or authorized distributors?
All ISL88813IB846Z 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 ISL88813IB846Z meets industry standards.
7.What is the process for return or replacement of ISL88813IB846Z?
All ISL88813IB846Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL88813IB846Z, 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 ISL88813IB846Z part is unused and in its original packaging.
Return procedure for ISL88813IB846Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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