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Renesas ISL12027IB30AZ
- Part No.:
- ISL12027IB30AZ
- Manufacturer:
- Renesas
- Category:
- Real Time Clocks
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL12027IB30AZ.pdf
- Description:
- IC RTC CLK/CALENDAR I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,641
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Product details
Overview
ISL12027IB30AZ from Intersil is a low-power real-time clock/calendar IC with integrated 512×8-bit EEPROM, two non-volatile alarms, on-chip oscillator compensation, CPU supervisor (POR/WDT), and intelligent battery backup switching. It operates from 2.7V to 5.5V main supply and retains timekeeping down to 1.8V on VBAT, with VRESET = 3.09V and −40°C to +85°C temperature range. Used in utility meters and network infrastructure for accurate time stamping and configuration storage.
For engineers reviewing the ISL12027IB30AZ datasheet, ISL12027IB30AZ pinout, ISL12027IB30AZ application, or ISL12027IB30AZ equivalent, this page delivers verified timing accuracy (±30ppm trim), I²C interface compliance (400kHz), EEPROM endurance (>2M cycles), battery current (850–1200nA at 3.0V VBAT), and alarm flexibility (second- to month-level repeatable triggers).
Technical Context
The ISL12027IB30AZ implements a crystal-based RTC architecture using an external 32.768kHz quartz resonator with fully integrated digital trim-64-position digitally controlled capacitor and six discrete frequency adjustment settings (±30ppm). Its dual-alarm system supports match-triggered polling and periodic interrupt modes via dedicated non-volatile registers.
Power management includes legacy-mode battery switchover (VBAT > VDD required), open-drain RESET output (active-low, 5kΩ pull-up recommended), and voltage monitoring with 30mV hysteresis on VTRIP. The device maintains full RTC/calendar functionality-including leap-year correction through 2099-in battery mode while disabling watchdog timer operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRESET Threshold | 3.09V nominal; asserts RESET when VDD drops below this level, enabling reliable brown-out detection in industrial power supplies. |
| Battery Supply Current | 850–1200nA at VBAT = 3.0V; enables multi-year backup operation from coin cells or supercapacitors. |
| I²C Interface Speed | 400kHz maximum; supports fast configuration and time updates without bus contention in embedded systems. |
| EEPROM Capacity & Structure | 512×8-bit (4kbit) in 32 pages of 16 bytes; enables secure, page-wise firmware parameter storage with BlockLock™ protection. |
| Oscillator Compensation Range | ±30ppm via 6 digital settings; corrects crystal drift across −40°C to +85°C without external capacitors. |
| Timekeeping Voltage Range | Operates fully from 2.7V–5.5V on VDD; calendar/RTC remains functional down to 1.8V on VBAT for uninterrupted timekeeping. |
| Alarm Flexibility | Two independent non-volatile alarms configurable per second, minute, hour, day-of-week, date, or month; supports repeat-mode interrupts. |
Pinout & Package
ISL12027IB30AZ is housed in an 8-lead SOIC package (Pb-free, RoHS compliant, package drawing M8.15), with thermal resistance θJA = 115°C/W and θJC = 50°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1 | Oscillator input | Connects to one terminal of external 32.768kHz crystal; internal inverting amplifier input-no external components required. |
| X2 | Oscillator output | Connects to other crystal terminal; internal inverting amplifier output-must not drive external loads. |
| VBAT | Backup supply input | Enables seamless switchover to battery/supercap during VDD failure; minimum 1.8V required for guaranteed RTC operation. |
| VDD | Main power supply | Primary 2.7–5.5V supply; powers all logic, EEPROM, and I²C interface; powers SCL/SDA pull-ups. |
| RESET | Open-drain reset output | Active-low signal indicating VDD brown-out or watchdog timeout; requires external 5kΩ pull-up to VDD. |
| SCL | I²C clock input | Asynchronous serial clock; always-enabled input buffer; pull-up must reference VDD. |
| SDA | I²C bidirectional data | Open-drain serial data line; supports wire-OR with other I²C devices; pull-up must reference VDD. |
| GND | Analog/digital ground | Common reference for all signals; must be low-impedance connection to minimize noise coupling into RTC circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip oscillator compensation | Digitally adjustable ±30ppm trim eliminates need for external load capacitors-reduces BOM count and layout sensitivity. |
| Non-volatile dual alarms | Two independently programmable alarms retain settings across power cycles and support periodic interrupt generation without host intervention. |
| Integrated CPU supervisor | Combines power-on reset (250ms delay), low-voltage detection (VRESET = 3.09V), and selectable watchdog timeout (225–775ms) in one die. |
| EEPROM with BlockLock™ | 512×8-bit memory with 8-level write-protection granularity prevents accidental overwrite of critical calibration or security data. |
| 50-year data retention | Guaranteed EEPROM data integrity for ≥50 years at ≤+75°C-enables long-lifecycle deployment in utility and infrastructure equipment. |
Applications
| Utility Meters | Network Routers & Switches |
|---|---|
Use Scenario: Time-stamping energy consumption logs and firmware update events in smart electricity/water/gas meters. IC Role / Device Role / Timing Role: Primary RTC/calendar with battery-backed timekeeping and EEPROM storage for tariff schedules and metering history. Use Value: Maintains accurate time across multi-year battery life and power interruptions; supports regulatory-compliant audit trails via non-volatile alarm-triggered logging. |
Use Scenario: Synchronizing SNMP trap timestamps, NTP server initialization, and configuration backup scheduling in enterprise networking gear. IC Role / Device Role / Timing Role: System-level time source and configuration register keeper; provides deterministic reset signaling during brown-out conditions. Use Value: Enables precise event correlation across distributed network nodes; EEPROM stores MAC address, serial number, and factory calibration data with BlockLock™ protection. |
| HVAC Equipment | POS Terminals |
Use Scenario: Logging maintenance intervals, sensor calibration cycles, and occupancy-scheduled operations in commercial HVAC controllers. IC Role / Device Role / Timing Role: Real-time scheduler and persistent parameter store; alarms trigger service alerts or seasonal mode changes. Use Value: Eliminates external RTC + EEPROM + supervisor ICs; reduces board space and improves reliability in thermally stressed environments. |
Use Scenario: Securing transaction timestamps, receipt generation, and firmware version tracking in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Tamper-resistant timekeeper and secure configuration vault; RESET output ensures clean boot after power loss. Use Value: Meets PCI-DSS timestamp integrity requirements; EEPROM endurance (>2M cycles) supports daily firmware updates over 5+ years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar real-time clock/calendar with EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1339U-33+T&R | Max I²C speed 100kHz; no on-chip oscillator trim; VRESET = 3.08V; 256×8 EEPROM; 2µA battery current. | Lacks digital frequency compensation and alarm repeat mode; suitable only where ±100ppm accuracy suffices. | Select DS1339U-33+T&R only if lower cost and reduced feature set are acceptable trade-offs for basic timekeeping. |
| PCF2129AT/1,118 | Integrated 32.768kHz oscillator (no X1/X2); ±5ppm accuracy; 128×8 EEPROM; 300nA battery current; I²C up to 400kHz. | Eliminates crystal but removes user-adjustable compensation; smaller EEPROM limits configuration storage depth. | Choose PCF2129AT/1,118 when crystal placement constraints dominate and factory-trimmed accuracy is sufficient. |
Compared with DS1339U-33+T&R and PCF2129AT/1,118, the ISL12027IB30AZ uniquely combines ±30ppm field-adjustable compensation, dual repeat-mode alarms, and 512×8 EEPROM with BlockLock™-making it optimal for applications requiring long-term accuracy, robust event scheduling, and secure parameter retention.
Availability
ISL12027IB30AZ is available at Aetrix Electronics and suitable for utility metering, network infrastructure, HVAC control, and POS terminal designs requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.
Supply support for ISL12027IB30AZ 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and timing solutions for industrial, communications, and computing markets.
The ISL12027IB30AZ belongs to Intersil's high-reliability RTC family designed for mission-critical timekeeping in infrastructure equipment-emphasizing battery longevity, crystal stability, and integrated supervision without external components.
FAQ
What is the VRESET threshold voltage for ISL12027IB30AZ?
The ISL12027IB30AZ has a nominal VRESET threshold of 3.09V, with guaranteed operation between 3.04V and 3.14V across −40°C to +85°C. This voltage determines when the open-drain RESET output asserts low during VDD brown-out events. The threshold is fixed for this variant and cannot be adjusted via registers-unlike other ISL12027 versions with different suffixes (e.g., IB27Z = 2.63V). ISL12027IB30AZ uses Legacy Mode Power Control, requiring VDD < VBAT for proper backup operation.
Does ISL12027IB30AZ support I²C communication during battery backup mode?
Yes, ISL12027IB30AZ supports full I²C read/write access-including RTC, alarm, and EEPROM registers-while operating from VBAT, provided VBAT ≥ 1.8V. However, the watchdog timer is disabled in battery mode, and RESET assertion remains active until VDD returns and exceeds VRESET. SCL and SDA pull-ups must be connected to VDD, not VBAT, so I²C functionality depends on VDD presence-even during VBAT operation. ISL12027IB30AZ does not support autonomous I²C activity solely from VBAT without VDD.
How many EEPROM write cycles does ISL12027IB30AZ guarantee?
ISL12027IB30AZ guarantees >2,000,000 write cycles per EEPROM byte-validated per JEDEC standards-with 50-year data retention at temperatures ≤+75°C. Each 16-byte page write consumes one cycle; single-byte writes are supported but less efficient. BlockLock™ protection prevents accidental writes to secured pages, preserving calibration or security-critical data. The ISL12027IB30AZ EEPROM is organized as 32 pages × 16 bytes, and non-volatile write cycle time is 12–20ms per operation.
Can ISL12027IB30AZ operate without an external crystal?
No, ISL12027IB30AZ requires an external 32.768kHz quartz crystal connected between X1 and X2 pins-it contains no integrated oscillator. The device integrates all compensation circuitry (64-position trim capacitor, feedback resistor, digital frequency adjustment) but relies on the crystal for timebase generation. Driving X1 with an external 32.768kHz clock is permitted, but X2 must not drive any external load. ISL12027IB30AZ explicitly prohibits external capacitors or resistors on X1/X2; doing so degrades accuracy and may cause startup failure.
What is the battery supply current specification for ISL12027IB30AZ?
ISL12027IB30AZ draws 850–1200nA from VBAT at 3.0V, with VDD, SCL, SDA, and RESET grounded-measured under SBIB = 0 (battery-only mode). This ultra-low current enables >10-year operation from standard CR2032 coin cells in typical utility meter applications. Battery leakage is specified at ±100nA when VDD = 5.5V and VBAT = 1.8V. The ISL12027IB30AZ achieves this by disabling non-essential circuits (e.g., watchdog, I²C interface) in battery mode while maintaining full RTC/calendar and alarm functionality.
ISL12027IB30AZ 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:
- Clock/Calendar
- Features:
- Alarm, Leap Year, Supervisor, Watchdog Timer
- Memory Size:
- -
- Time Format:
- HH:MM:SS (12/24 hr)
- Date Format:
- YY-MM-DD-dd
- Interface:
- I2C, 2-Wire Serial
- Voltage - Supply:
- 2.7V ~ 5.5V
- Voltage - Supply, Battery:
- 1.8V ~ 5.5V
- Current - Timekeeping (Max):
- 10µA ~ 20µA @ 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
ISL12027IB30AZ FAQ
1.How can I place an order for ISL12027IB30AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL12027IB30AZ 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 ISL12027IB30AZ reliable?
The price and inventory of ISL12027IB30AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL12027IB30AZ is usually 5 days.
3.What payment methods are accepted for ISL12027IB30AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL12027IB30AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL12027IB30AZ?
ISL12027IB30AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL12027IB30AZ 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 ISL12027IB30AZ?
For technical support, including ISL12027IB30AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL12027IB30AZ requirements.
6.How does Aetrix verify that ISL12027IB30AZ is sourced from the original manufacturer or authorized distributors?
All ISL12027IB30AZ 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 ISL12027IB30AZ meets industry standards.
7.What is the process for return or replacement of ISL12027IB30AZ?
All ISL12027IB30AZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL12027IB30AZ, 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 ISL12027IB30AZ part is unused and in its original packaging.
Return procedure for ISL12027IB30AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL12027IB30AZ Tags
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MCP7940N-I/SN
Microchip Technology
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MCP7940MT-I/MNY
Microchip Technology
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PCF85063ATL/1,118
NXP USA Inc.
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MCP7940NT-I/SN
Microchip Technology
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MCP7940NT-I/MS
Microchip Technology
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MCP7940N-I/MS
Microchip Technology
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PCF85063AT/AY
NXP USA Inc.
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PCF85063TP/1Z
NXP Semiconductors
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PCF85063ATT/AJ
NXP USA Inc.
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MCP7940NT-E/SN
Microchip Technology
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MCP7940NT-I/MNY
Microchip Technology
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MCP79400T-I/SN
Microchip Technology
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