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Renesas ISL12026IBZ-T
- Part No.:
- ISL12026IBZ-T
- Manufacturer:
- Renesas
- Category:
- Real Time Clocks
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL12026IBZ-T.pdf
- Description:
- IC RTC CLK/CALENDAR I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
ISL12026IBZ-T from Intersil (now Renesas) is a micro-power real-time clock/calendar IC with integrated 512×8-bit EEPROM, I²C interface, dual non-volatile alarms, and on-chip oscillator compensation for 32.768kHz crystals. It maintains accurate timekeeping down to 1.8V in battery backup mode, supports leap-year correction through 2099, and delivers 800nA battery supply current. It is used in utility meters and HVAC equipment where long-term time accuracy and data retention are critical.
For engineers reviewing the ISL12026IBZ-T datasheet, ISL12026IBZ-T pinout, ISL12026IBZ-T application, or ISL12026IBZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed I²C timing compliance at 400kHz, exact EEPROM endurance (2M cycles), and real-world alarm configuration capabilities - all specific to the ISL12026IBZ-T variant with Legacy Mode power control and SOIC-8 packaging.
Technical Context
The ISL12026IBZ-T implements a crystal-based RTC architecture with separate volatile timekeeping registers (hours/minutes/seconds/date/month/year/day-of-week) and non-volatile alarm registers, both accessible via I²C. Its oscillator compensation uses a 64-position digitally controlled trim capacitor and six discrete frequency adjustment settings (±30ppm), enabling calibration without external components.
Power management includes intelligent automatic switching between VDD and VBAT, with a programmable VBAT trip threshold (1.8–2.6V) and hysteresis (50mV). The IRQ/FOUT pin operates as either an open-drain interrupt output or a selectable 1Hz/4096Hz/32.768Hz frequency output, controlled via the INT register's FO1/FO0 bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Main Supply Range | 2.7V to 5.5V - supports standard logic rails and ensures full RTC+EEPROM operation |
| Battery Supply Range | 1.8V to 5.5V - enables continuous timekeeping during main power loss |
| I²C Speed | 400kHz - compatible with Fast-mode I²C systems without clock stretching |
| Battery Current | 800–1000nA at VBAT = 1.8V - extends coin-cell life beyond 10 years in typical metering applications |
| EEPROM Size & Protection | 512×8-bit with 8 BlockLock™ modes - allows secure configuration storage and user data partitioning |
| Oscillator Accuracy Control | ±30ppm digital trim via 6 ATR settings - corrects crystal drift over temperature without external capacitors |
| Data Retention | 50 years - guarantees calendar/alarm/EEPROM data integrity across product lifecycle |
Pinout & Package
ISL12026IBZ-T is housed in an 8-lead Pb-free SOIC package (M8.15 drawing), with gull-wing leads, RoHS-compliant matte tin plating, and moisture sensitivity level (MSL) rating per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1 | Oscillator Input | Inverting amplifier input for 32.768kHz crystal; accepts direct 32.768kHz square-wave drive |
| X2 | Oscillator Output | Inverting amplifier output connected to crystal; must not drive external loads |
| VBAT | Backup Power Input | Supplies RTC and SRAM during VDD failure; triggers automatic switchover at 1.8–2.6V threshold |
| VDD | Main Power Supply | Primary power source; powers I²C interface, EEPROM writes, and full register access |
| IRQ/FOUT | Multi-function Open-Drain Pin | Configurable as alarm interrupt (active-low) or 1Hz/4096Hz/32.768Hz clock output |
| SCL | I²C Clock Input | Always-active input buffer; requires pull-up to VDD; defines I²C transaction timing |
| SDA | I²C Data Bidirectional | Open-drain I/O with slope-controlled pull-down; supports wire-OR with other I²C devices |
| GND | Analog/Digital Ground | Common reference for all internal circuitry; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Legacy Mode Power Control | BSW = 1 default; follows X1226-compatible behavior for predictable VBAT switchover sequencing |
| Two Non-Volatile Alarms | Each independently configurable to second/minute/hour/day-of-week/date/month; supports repeat mode for periodic interrupts |
| Integrated Oscillator Compensation | Eliminates need for external trim capacitors; 64-step digital capacitance tuning enables factory or system-level calibration |
| Page Write EEPROM | 16-byte page write (32 pages total); reduces I²C transaction overhead and wear leveling burden vs. byte-by-byte writes |
| Real-Time Latched Reads | RTC register values are hardware-latched on ACK edge - prevents read corruption during clock updates |
Applications
| Utility Metering | HVAC Control Systems |
|---|---|
Use Scenario: Time-stamping energy consumption data and scheduling tariff changes in smart electricity/water/gas meters. IC Role / Device Role / Timing Role: Primary RTC/calendar with battery-backed timekeeping and non-volatile alarm-triggered logging. Use Value: Maintains ±30ppm accuracy over –40°C to +85°C using on-chip trim; 50-year EEPROM retention secures billing history and firmware timestamps. |
Use Scenario: Scheduling fan operation, temperature setpoint changes, and maintenance alerts in residential/commercial HVAC controllers. IC Role / Device Role / Timing Role: System timekeeper and event scheduler with dual alarms driving relay control or UI notifications. Use Value: 800nA battery current enables >10-year CR2032 operation; IRQ/FOUT pin simplifies interrupt-driven firmware design without external logic. |
| Set-Top Box / Television | Industrial Test Equipment |
Use Scenario: Managing electronic program guides (EPG), recording timers, and firmware update windows in broadcast receivers. IC Role / Device Role / Timing Role: Calendar-synchronized alarm generator and persistent time source across power cycles. Use Value: Automatic leap-year correction through 2099 ensures EPG accuracy; I²C interface integrates cleanly with SoC host processors. |
Use Scenario: Timestamping measurement results, calibrating test intervals, and tracking calibration due dates in portable multimeters and signal analyzers. IC Role / Device Role / Timing Role: High-reliability timebase for data logging and scheduled self-test execution. Use Value: >2,000,000 EEPROM write cycles support frequent calibration log updates; RTCF bit flags complete power loss for diagnostic recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar real-time clock/calendar applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL12026AIBZ-T | Standard Mode power control (BSW = 0); VBAT trip point fixed at 2.2V; no Legacy Mode compatibility | Preferred for new designs requiring tighter VBAT threshold control and simplified power sequencing | Select only if Legacy Mode behavior is unnecessary and 2.2V VBAT switchover is acceptable |
| DS1339U-33+T&R | No integrated EEPROM; lower battery current (300nA); no oscillator compensation circuitry | Suitable for cost-sensitive applications where external memory suffices and crystal calibration is handled externally | Choose when EEPROM is unnecessary and ultra-low IBAT outweighs feature set |
Compared with ISL12026IBZ-T, the ISL12026AIBZ-T offers deterministic VBAT switching but loses X1226 compatibility, while the DS1339U-33+T&R reduces power and BOM count at the expense of integrated memory and trimming capability - making ISL12026IBZ-T optimal for legacy-aligned, feature-rich metering and industrial timing.
Availability
ISL12026IBZ-T is available at Aetrix Electronics and suitable for utility metering, HVAC control systems, and industrial test equipment requiring stable component supply, long-term calibration traceability, and guaranteed 50-year data retention.
Supply support for ISL12026IBZ-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
Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in analog, mixed-signal, and embedded processing solutions for industrial, automotive, and infrastructure markets.
The ISL12026IBZ-T belongs to Renesas' precision RTC product line, designed specifically for applications demanding high-accuracy, battery-backed timekeeping with integrated non-volatile memory and robust power-fail resilience.
FAQ
What is the VBAT trip threshold voltage for ISL12026IBZ-T?
The ISL12026IBZ-T has a programmable VBAT mode threshold (VTRIP) ranging from 1.8V to 2.6V, with typical hysteresis of 50mV. This Legacy Mode behavior follows X1226 specifications and ensures reliable switchover during brownout conditions. The exact trip point is determined by internal comparator design and is validated across –40°C to +85°C per FN8231 Rev 9.00.
Does ISL12026IBZ-T support I²C Fast-mode operation?
Yes, ISL12026IBZ-T fully supports I²C Fast-mode at 400kHz, with AC timing parameters including tLOW (1300ns), tHIGH (600ns), and tSU:STA (600ns) specified and tested per JEDEC standards. Its open-drain SDA/SCL drivers and slope-controlled outputs ensure signal integrity up to 400kHz under 400pF bus loading.
How does the oscillator compensation work in ISL12026IBZ-T?
The ISL12026IBZ-T implements on-chip oscillator compensation using a 64-position digitally controlled trim capacitor and six discrete ATR settings (±30ppm), allowing fine-tuning of 32.768kHz crystal frequency. This eliminates external trim caps and enables factory or system-level calibration - a key differentiator from basic RTCs like DS1307.
Can ISL12026IBZ-T retain time during a complete power loss?
Yes - ISL12026IBZ-T retains timekeeping functionality as long as VBAT ≥ 1.8V. After total power loss (VDD = 0V and VBAT = 0V), the RTCF bit is set, and the clock halts until at least one byte is written to the RTC registers. Once initialized, it resumes accurate timekeeping using the backup supply.
What EEPROM protection modes does ISL12026IBZ-T offer?
ISL12026IBZ-T provides eight BlockLock™ protection modes via BP2/BP1/BP0 bits, enabling selective write-protection across eight 64-byte segments of its 512×8-bit EEPROM array. This allows secure storage of calibration constants in locked blocks while permitting frequent updates to user data in unprotected regions.
ISL12026IBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock/Calendar
- Features:
- Alarm, Leap Year
- 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
ISL12026IBZ-T FAQ
1.How can I place an order for ISL12026IBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL12026IBZ-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 ISL12026IBZ-T reliable?
The price and inventory of ISL12026IBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL12026IBZ-T is usually 5 days.
3.What payment methods are accepted for ISL12026IBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL12026IBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL12026IBZ-T?
ISL12026IBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL12026IBZ-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 ISL12026IBZ-T?
For technical support, including ISL12026IBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL12026IBZ-T requirements.
6.How does Aetrix verify that ISL12026IBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL12026IBZ-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 ISL12026IBZ-T meets industry standards.
7.What is the process for return or replacement of ISL12026IBZ-T?
All ISL12026IBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL12026IBZ-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 ISL12026IBZ-T part is unused and in its original packaging.
Return procedure for ISL12026IBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL12026IBZ-T Tags
-
MCP7940N-I/SN
Microchip Technology
-
MCP7940MT-I/MNY
Microchip Technology
-
PCF85063ATL/1,118
NXP USA Inc.
-
MCP7940NT-I/SN
Microchip Technology
-
MCP7940NT-I/MS
Microchip Technology
-
MCP7940N-I/MS
Microchip Technology
-
PCF85063AT/AY
NXP USA Inc.
-
PCF85063TP/1Z
NXP Semiconductors
-
PCF85063ATT/AJ
NXP USA Inc.
-
MCP7940NT-E/SN
Microchip Technology
-
MCP7940NT-I/MNY
Microchip Technology
-
MCP79400T-I/SN
Microchip Technology
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