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Renesas ISL1209IU10Z-TK
- Part No.:
- ISL1209IU10Z-TK
- Manufacturer:
- Renesas
- Category:
- Real Time Clocks
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL1209IU10Z-TK.pdf
- Description:
- IC RTC EVENT REC I2C 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:998
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Product details
Overview
ISL1209IU10Z-TK from Renesas (formerly Intersil) is a low-power real-time clock IC with integrated battery-backed SRAM, event/tamper detection, I²C interface, and programmable frequency output. It tracks time and calendar (accurate through 2099), supports automatic leap-year correction, operates from 2.7V to 5.5V main supply and down to 1.8V on backup, and draws only 400nA from VBAT. It is used in utility meters, security systems, and network infrastructure where tamper-proof timekeeping and power-fail resilience are critical.
For engineers reviewing the ISL1209IU10Z-TK datasheet, ISL1209IU10Z-TK pinout, ISL1209IU10Z-TK application, or ISL1209IU10Z-TK equivalent, this page delivers verified technical context-including crystal compensation range (-94ppm to +140ppm), 15 selectable frequency outputs, EVIN sampling rates (1/4 Hz to 2 Hz), IRQ/FOUT dual-mode configuration, and battery switchover thresholds (VTRIP ≈ 2.2V, VBATHYS ≈ 50mV)-to support secure, low-power RTC integration.
Technical Context
The ISL1209IU10Z-TK implements a crystal-based RTC core using an external 32.768kHz quartz oscillator with on-chip analog (ATR) and digital (DTR) trimming for ±60ppm counter adjustment and ±80ppm capacitance tuning. Its event detection circuit operates in both VDD and VBAT modes, with user-selectable glitch filtering (0–31.25ms) and sampling rates (1/4 Hz, 1 Hz, 2 Hz) to minimize current draw.
Power management includes intelligent VDD-to-VBAT switchover governed by dual thresholds (VTRIP and VBATHYS), InterSeal™ Battery Saver to prevent pre-use drain, and Low Power Mode (LPMODE) that reduces IDD1 by ~600nA at 5V by disabling VTRIP monitoring. The I²C interface runs at up to 400kHz and deactivates in battery backup mode, while all RTC registers, alarm logic, and 2-byte SRAM remain fully functional down to 1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Main Supply Range | 2.7V to 5.5V - Ensures compatibility with standard industrial and telecom rails without level-shifting. |
| Battery Supply Range | 1.8V to 5.5V - Supports lithium coin cells (3.0V) and supercaps; RTC remains active down to 1.8V. |
| VBAT Current | 400nA typical at 3V - Enables >10-year battery life with common CR2032 cells. |
| I²C Speed | 400kHz - Full Fast-Mode compliance for high-throughput register access and SRAM writes. |
| Crystal Compensation | -94ppm to +140ppm - Achieved via combined ATR (capacitance) and DTR (counter) trimming for temperature-stable accuracy. |
| Event Sampling Rates | 1/4 Hz, 1 Hz, 2 Hz - Configurable via control register to balance responsiveness and ultra-low power in tamper monitoring. |
| Frequency Outputs | 15 selectable options from 0Hz to 32.768kHz - Generated on IRQ/FOUT pin; enables system clock distribution or timing reference sharing. |
Pinout & Package
ISL1209IU10Z-TK is housed in a Pb-free 10-lead MSOP package (M10.118), 3.0mm × 4.9mm × 1.0mm, suitable for space-constrained metering and security modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1 | Oscillator Input | Inverting amplifier input for 32.768kHz crystal;也可 driven directly by external clock source. |
| X2 | Oscillator Output | Inverting amplifier output; left open when X1 is externally driven. |
| VBAT | Backup Supply Input | Provides power during VDD failure; triggers automatic switchover when VDD < VTRIP (≈2.2V) and VDD < VBAT – 50mV. |
| GND | Ground Reference | Common return for all analog and digital circuits; must be low-impedance for RTC stability. |
| EVIN | Event Detection Input | Monitors external switch or sensor; supports internal pull-up (~1µA) and configurable hysteresis (0–31.25ms). |
| EVDET | Event Detect Output | Open-drain active-low signal asserting on valid EVIN event; remains low until EVT bit is cleared. |
| SDA | I²C Bidirectional Data | Open-drain bus line; requires external pull-up; disabled in battery backup mode to reduce leakage. |
| SCL | I²C Clock Input | Input-only clock line; always active in VDD mode; gated off in VBAT mode for power savings. |
| IRQ/FOUT | Multi-function Pin | Configurable as interrupt output (active-low open drain) or frequency output (15 selectable rates); function set via FO bits. |
| VDD | Main Power Supply | Primary operating voltage; powers all logic, I²C, and SRAM; supplies internal regulator for RTC core. |
Key Features
| Feature | Design Value |
|---|---|
| InterSeal™ Battery Saver | Zero pre-use VBAT current draw until first VDD power-up, preserving shelf life of battery-equipped modules. |
| Automatic Leap-Year Correction | Hardware-calculated calendar logic ensures accurate date progression through year 2099 without host intervention. |
| Programmable Event Glitch Filter | Selectable 0 / 3.9ms / 15.625ms / 31.25ms hysteresis prevents false triggers from mechanical switch bounce or EMI. |
| Low-Power Mode (LPMODE) | Reduces VDD supply current by ~600nA at 5V by eliminating VTRIP comparator monitoring-ideal for fixed VDD > VBAT systems. |
| Single-Byte Alarm Flexibility | Alarm can match second, minute, hour, day-of-week, date, or month independently-enabling precise scheduling (e.g., "every Tuesday at 3:15 AM"). |
Applications
| Utility Meter Time Stamping | Security Enclosure Tamper Monitoring |
|---|---|
Use Scenario: Recording timestamped energy consumption events in smart electricity/water meters deployed in unattended outdoor locations. IC Role / Device Role / Timing Role: Primary RTC and calendar source; provides authenticated, battery-backed time stamps for billing data and firmware updates. Use Value: Maintains sub-minute accuracy over 10+ years via crystal compensation and low IBAT (400nA), ensuring regulatory-compliant audit trails even during grid outages. |
Use Scenario: Detecting unauthorized cabinet opening in network routers or POS terminals using a magnetic reed switch connected to EVIN. IC Role / Device Role / Timing Role: Tamper-detection engine with time-stamped event logging; stops RTC advancement upon breach to preserve forensic timing. Use Value: Combines hardware-level event capture (EVIN/EVDET), RTC freeze-on-tamper, and battery-backed SRAM storage-eliminating need for external microcontroller polling. |
| Network Equipment Power-Fail Logging | Fixed Wireless Base Station Calendar Sync |
Use Scenario: Capturing precise uptime/downtime logs in enterprise switches and firewalls during brownouts or UPS transitions. IC Role / Device Role / Timing Role: Power-fail indicator (RTCF bit) and persistent timekeeper; maintains calendar continuity across repeated VDD interruptions. Use Value: Delivers deterministic switchover (VTRIP ≈ 2.2V, hysteresis ≈ 30mV) and retains full RTC operation on VBAT down to 1.8V-critical for SLA reporting. |
Use Scenario: Providing synchronized time base for GPS-disciplined oscillators and packet timestamping in 5G fixed wireless CPE units. IC Role / Device Role / Timing Role: High-stability calendar reference with 15-frequency output (e.g., 1Hz or 100Hz) for system-level timing distribution. Use Value: On-chip crystal compensation (-94ppm to +140ppm) corrects for thermal drift across -40°C to +85°C, reducing reliance on external calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar real-time clock applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Maxim DS1339 | Single alarm only; no event detection, no EVIN/EVDET pins; 256B battery-backed SRAM vs. 2B; no crystal compensation. | Lacks tamper monitoring and time-stamped event capture-unsuitable for security-critical or warranty-reporting use cases. | Choose DS1339 only if large SRAM and basic RTC functionality suffice, and event detection is handled externally. |
| Analog Devices ADT7411 | Combines 12-bit ADC + temperature sensor + RTC; no dedicated EVIN pin; I²C max speed 400kHz; no frequency output or crystal trim. | Targets sensor fusion applications-not optimized for standalone tamper-aware timekeeping or power-fail resilience. | Select ADT7411 when simultaneous temperature sensing and RTC are required, but avoid if crystal compensation or event-triggered RTC freeze is needed. |
Compared with DS1339 and ADT7411, the ISL1209IU10Z-TK uniquely integrates tamper-aware event detection with hardware RTC freeze, programmable crystal compensation, and multi-rate frequency output-all in a 10-lead MSOP-making it the only choice for compact, battery-powered security and utility metering designs requiring certified time integrity.
Availability
ISL1209IU10Z-TK is available at Aetrix Electronics and suitable for utility metering, network infrastructure, and security equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL1209IU10Z-TK 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 continues to support its precision analog and timing portfolio. Renesas is a global semiconductor leader focused on embedded solutions for automotive, industrial, and IoT markets.
The ISL1209IU10Z-TK belongs to Renesas' legacy Intersil RTC family, designed specifically for secure, low-power timekeeping in metering, telecom, and anti-tampering applications where battery longevity and event-logged time stamps are mandatory.
FAQ
What is the maximum crystal frequency tolerance compensation supported by the ISL1209IU10Z-TK?
The ISL1209IU10Z-TK supports total crystal compensation from -94ppm to +140ppm using combined analog trimming (ATR) and digital trimming (DTR) registers. This allows fine-tuning of oscillator accuracy across temperature variations without external components, enabling sub-minute-per-month timekeeping stability in industrial environments.
Does the ISL1209IU10Z-TK retain RTC functionality during battery backup mode?
Yes, the ISL1209IU10Z-TK maintains full RTC, calendar, alarm, and 2-byte SRAM operation during battery backup mode down to 1.8V. However, the I²C interface (SCL/SDA) is disabled to minimize current draw-register access and SRAM reads/writes must occur during VDD operation.
How does the EVIN pin behave when configured for low-power sampling?
When EVIN sampling is enabled (1/4 Hz, 1 Hz, or 2 Hz), the ISL1209IU10Z-TK pulses the input circuit ON/OFF to reduce average current. For example, at 1 Hz sampling with 3.9ms hysteresis, ΔIDD adds only 82nA at 3V-enabling years of tamper monitoring on a single coin cell without compromising detection reliability.
Can the IRQ/FOUT pin output both interrupt and frequency signals simultaneously?
No-the IRQ/FOUT pin is strictly dual-mode: it functions either as an active-low open-drain interrupt output (IRQ) or as a programmable frequency output (FOUT), selected via the FO bits in the control register. Enabling FOUT disables the alarm interrupt function, and vice versa.
What is the purpose of the InterSeal™ Battery Saver feature in the ISL1209IU10Z-TK?
The InterSeal™ Battery Saver prevents any current draw from the VBAT source until the ISL1209IU10Z-TK is first powered via VDD. This preserves battery shelf life in pre-assembled modules-ensuring full operational life (e.g., >10 years with CR2032) begins only after field deployment, not during storage or board assembly.
ISL1209IU10Z-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Time Event Recorder
- Features:
- Alarm, Leap Year, SRAM
- Memory Size:
- 2B
- 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):
- 4µA ~ 6µA @ 3V ~ 5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-MSOP
ISL1209IU10Z-TK FAQ
1.How can I place an order for ISL1209IU10Z-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL1209IU10Z-TK 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 ISL1209IU10Z-TK reliable?
The price and inventory of ISL1209IU10Z-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL1209IU10Z-TK is usually 5 days.
3.What payment methods are accepted for ISL1209IU10Z-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL1209IU10Z-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL1209IU10Z-TK?
ISL1209IU10Z-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL1209IU10Z-TK 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 ISL1209IU10Z-TK?
For technical support, including ISL1209IU10Z-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL1209IU10Z-TK requirements.
6.How does Aetrix verify that ISL1209IU10Z-TK is sourced from the original manufacturer or authorized distributors?
All ISL1209IU10Z-TK 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 ISL1209IU10Z-TK meets industry standards.
7.What is the process for return or replacement of ISL1209IU10Z-TK?
All ISL1209IU10Z-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL1209IU10Z-TK, 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 ISL1209IU10Z-TK part is unused and in its original packaging.
Return procedure for ISL1209IU10Z-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL1209IU10Z-TK 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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