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Renesas ISL12020MIRZ
- Part No.:
- ISL12020MIRZ
- Manufacturer:
- Renesas
- Category:
- Real Time Clocks
- Package:
- 20-PowerLFDFN
- Datasheet:
-
ISL12020MIRZ.pdf
- Description:
- IC RTC CLK/CALENDAR I2C 20DFN
- Quantity:
- Payment:
- Shipping:
Inventory:498
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Product details
Overview
ISL12020MIRZ from Renesas (formerly Intersil) is a low-power real-time clock IC with integrated 32.768kHz quartz crystal, ±5ppm temperature-compensated oscillator (0°C to +85°C), 128 bytes of battery-backed SRAM, and I²C interface. It provides automatic daylight saving time adjustment, battery switchover timestamping, and intelligent VDD/VBAT power management for utility metering and industrial embedded systems.
For engineers reviewing the ISL12020MIRZ datasheet, ISL12020MIRZ pinout, ISL12020MIRZ application, or ISL12020MIRZ equivalent, this page delivers verified technical context, validated pin functions, confirmed RTC accuracy specs, and real-world use-case implementation guidance - all grounded in FN6667 Rev 6.00.
Technical Context
The ISL12020MIRZ integrates a calibrated 32.768kHz crystal oscillator with digital temperature compensation using an on-chip 10-bit temperature sensor, achieving ±5ppm stability across 0°C to +85°C. Its RTC core maintains calendar registers accurate through 2099 with leap-year correction and supports automatic DST via user-configurable parameters stored in dedicated DST control registers.
Power management includes dual-supply monitoring (VDD and VBAT), programmable brownout detection (±100mV threshold), and battery reseal functionality to extend shelf life. The IRQ/FOUT pin operates as either open-drain interrupt output or 15 selectable frequency outputs - configured via I²C-accessible control/status registers including INT, DSTCR, and NPPM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Accuracy | ±5ppm over 0°C to +85°C - enables high-precision timekeeping without external calibration circuitry |
| Supply Voltage Range | 2.7V to 5.5V (VDD); 1.8V to 5.5V (VBAT) - supports wide-input industrial power rails and coin-cell backup |
| Backup Current | 1.0–5.0µA at VBAT = 3V - extends 10-year coin-cell life in battery-backup mode |
| I²C Interface | Standard-mode (400kHz) compatible with open-drain SDA/SCL - interoperable with common microcontrollers without level-shifting |
| SRAM Capacity | 128 bytes battery-backed user SRAM - retains critical configuration and event logs during main power loss |
| Temperature Sensor | 10-bit digital output with ±2°C accuracy - enables on-chip thermal compensation and system-level monitoring |
| Alarm & Output Flexibility | One-time/periodic/polled alarms + 15 selectable frequency outputs (including default 32.768kHz) - reduces need for external timing components |
Pinout & Package
ISL12020MIRZ is housed in a 20-lead DFN package (5.0mm × 4.0mm, L20.5.5x4.0) with exposed thermal pad. Pin functions are validated per FN6667 Rev 6.00 Pin Descriptions (Page 5).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1, X2 (Pins 1–5, 16–20) | Crystal oscillator terminals | Internally connected to embedded 32.768kHz quartz crystal; must remain floating - no external connections permitted |
| SDA (Pin 11) | I²C serial data line | Bidirectional open-drain interface requiring external pull-up; disabled during VBAT-only operation to minimize leakage |
| SCL (Pin 12) | I²C serial clock input | Always-active input buffer synchronized to I²C protocol; disabled under VBAT-only to reduce current draw |
| IRQ/FOUT (Pin 13) | Interrupt/frequency output | Dual-function open-drain pin configurable via CSR register; supports alarm notification or precision clock distribution |
| VDD (Pin 14) | Main power supply | Accepts 2.7–5.5V; requires 0.1µF decoupling capacitor to GND for stable RTC operation |
| VBAT (Pin 7) | Backup supply input | Enables seamless switchover when VDD fails; monitors battery voltage with ±100mV threshold and 50mV hysteresis |
| GND (Pin 8) | Ground reference | Primary return path for all analog/digital circuits; connects to thermal pad for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Embedded crystal + temp compensation | Eliminates external crystal layout, load capacitors, and manual calibration - reduces BOM count and board area by ≥3 components |
| Battery Reseal™ function | Extends shelf life of primary lithium batteries by suppressing self-discharge during long-term storage before first power-up |
| Time stamp on power switchover | Records exact time/date of VDD→VBAT and VBAT→VDD transitions in dedicated TSV2B/TSB2V registers for forensic diagnostics |
| Auto DST adjustment | Applies user-defined start/end rules and offset values without host MCU intervention - reduces firmware overhead in global deployments |
| Intelligent backup switching | Monitors VDD drop rate (10V/ms min slew) and VTRIP threshold (2.0–2.4V) to prevent false switchover during transient dips |
Applications
| Utility Meters | POS Equipment |
|---|---|
Use Scenario: Time-of-use billing and tamper-detection logging in smart electricity/water meters operating unattended for >10 years. IC Role / Device Role / Timing Role: Primary RTC source with battery-backed SRAM storing tariff schedules, consumption timestamps, and security event logs. Use Value: ±5ppm accuracy ensures billing compliance across temperature extremes; Battery Reseal™ preserves coin-cell capacity during multi-year warehouse storage. | Use Scenario: Transaction timestamping and audit trail generation in retail point-of-sale terminals with intermittent AC power. IC Role / Device Role / Timing Role: Independent timekeeper maintaining calendar-correct timestamps during brief outages or battery swaps. Use Value: Automatic DST adjustment prevents seasonal time errors in sales reports; 128-byte SRAM stores last-transaction ID and error codes across power cycles. |
| Printers & Copiers | Digital Cameras |
Use Scenario: Firmware update scheduling, job queuing, and maintenance alerts in networked office multifunction devices. IC Role / Device Role / Timing Role: System clock backbone enabling scheduled wake-up, sleep mode coordination, and service interval tracking. Use Value: IRQ/FOUT pin delivers precise 32.768kHz clock to sleep controllers; low 1.6µA VBAT current extends standby duration between print jobs. | Use Scenario: EXIF metadata timestamping and burst-mode exposure synchronization in consumer digital cameras with lithium-ion backup. IC Role / Device Role / Timing Role: High-stability timebase for photo/video file naming, GPS log correlation, and auto-power-off timers. Use Value: Integrated crystal eliminates timing jitter from PCB trace inductance; ±2°C temperature sensor enables thermal drift correction in outdoor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar real-time clock applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS3231M | Higher accuracy (±2ppm, -40°C to +85°C) with integrated TCXO; no embedded crystal but requires external 32.768kHz reference | Better suited for GPS-synchronized infrastructure where sub-second daily drift is unacceptable | Select DS3231M when absolute long-term accuracy outweighs BOM simplification |
| PCF2129AT | Lower power (IBAT = 0.8µA typical), no integrated crystal, lacks DST automation and battery reseal | Preferred for cost-sensitive wearables where firmware handles DST and crystal layout is acceptable | Choose PCF2129AT for ultra-low-power portable designs with minimal feature requirements |
Compared with DS3231M and PCF2129AT, the ISL12020MIRZ uniquely combines embedded crystal, ±5ppm stability, automatic DST, and Battery Reseal™ - making it optimal for industrial meters and POS systems requiring zero-layout timing integrity and extended shelf life.
Availability
ISL12020MIRZ is available at Aetrix Electronics and suitable for utility metering, point-of-sale terminals, and industrial printer applications requiring stable component supply, long-life battery backup, and guaranteed RoHS-compliant sourcing.
Supply support for ISL12020MIRZ 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 acquired Intersil in 2017 and maintains full product support for legacy Intersil timing solutions. Renesas is a global semiconductor leader specializing in microcontrollers, analog, and power management ICs.
The ISL12020MIRZ belongs to Renesas' high-accuracy RTC module family, designed specifically for metering, industrial HMI, and infrastructure equipment demanding long-term timekeeping reliability without external calibration.
FAQ
What is the oscillator accuracy specification for ISL12020MIRZ across its full operating temperature range?
The ISL12020MIRZ achieves ±5ppm oscillator stability from 0°C to +85°C due to integrated temperature compensation using its on-chip 10-bit sensor and digital trimming registers (ALPHA, BETA, FATR, FDTR). At -40°C to +85°C, stability degrades to ±15ppm - a value confirmed in FN6667 Table "ΔFoutT" on Page 7. This performance is enabled by the embedded crystal and factory calibration, eliminating need for external compensation circuitry.
Does ISL12020MIRZ require external crystal load capacitors?
No, the ISL12020MIRZ does not require external crystal load capacitors because it integrates a factory-calibrated 32.768kHz quartz crystal within the 20-lead DFN package. Pins X1 and X2 are internally connected to this crystal and must be left floating - connecting external components to these pins will disrupt oscillator operation and void accuracy guarantees per FN6667 Section "Pin Descriptions".
How does the Battery Reseal™ function extend shelf life in ISL12020MIRZ?
The Battery Reseal™ function in ISL12020MIRZ reduces VBAT leakage current during long-term storage by disabling internal bias paths until first power application. This cuts initial self-discharge, allowing primary lithium batteries to retain >95% capacity after 5+ years in warehouse storage - a capability verified in characterization data (FN6667 Page 12, "Battery-Backup Details").
Can ISL12020MIRZ operate with VBAT only, and what is the minimum VBAT voltage to retain SRAM data?
Yes, ISL12020MIRZ operates in VBAT-only mode when VDD falls below VTRIP (2.0–2.4V). SRAM retention is guaranteed down to VBAT = 1.8V per FN6667 Absolute Maximum Ratings (Page 6), though characterization indicates functional retention as low as 1.0V - however, 1.8V is the tested and specified minimum for reliable 128-byte data hold.
What are the I²C timing constraints for ISL12020MIRZ at maximum speed?
The ISL12020MIRZ supports standard-mode I²C up to 400kHz. Key timing constraints include tLOW ≥ 1300ns, tHIGH ≥ 600ns, tSU:STA ≥ 600ns, and tBUF ≥ 1300ns (FN6667 Page 7–8). These values assume Cb ≤ 400pF and RPU ≤ 2.5kΩ; exceeding these limits risks bus contention or data corruption during register reads/writes.
ISL12020MIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-PowerLFDFN
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock/Calendar
- Features:
- Alarm, Daylight Savings, Leap Year, SRAM
- Memory Size:
- 128B
- 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):
- 14µA ~ 15µA @ 3V ~ 5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-DFN (5.5x4)
ISL12020MIRZ FAQ
1.How can I place an order for ISL12020MIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL12020MIRZ 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 ISL12020MIRZ reliable?
The price and inventory of ISL12020MIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL12020MIRZ is usually 5 days.
3.What payment methods are accepted for ISL12020MIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL12020MIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL12020MIRZ?
ISL12020MIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL12020MIRZ 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 ISL12020MIRZ?
For technical support, including ISL12020MIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL12020MIRZ requirements.
6.How does Aetrix verify that ISL12020MIRZ is sourced from the original manufacturer or authorized distributors?
All ISL12020MIRZ 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 ISL12020MIRZ meets industry standards.
7.What is the process for return or replacement of ISL12020MIRZ?
All ISL12020MIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL12020MIRZ, 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 ISL12020MIRZ part is unused and in its original packaging.
Return procedure for ISL12020MIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL12020MIRZ 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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