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Home > Products > Integrated Circuits (ICs) > Clock/Timing - Real Time Clocks > AB1804-T3
Abracon LLC
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AB1804-T3

Manufacturer Part Number:
AB1804-T3
Manufacturer / Brand
Abracon LLC
Part of Description:
IC RTC CLK/CALENDAR I2C 16QFN
Datasheets:
AB1804-T3(1).pdfAB1804-T3(2).pdfAB1804-T3(3).pdfAB1804-T3(4).pdfAB1804-T3(5).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 4677 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number AB1804-T3
Manufacturer / Brand Abracon LLC
Stock Quantity 4677 pcs Stock
Category Integrated Circuits (ICs) > Clock/Timing - Real Time Clocks
Description IC RTC CLK/CALENDAR I2C 16QFN
Lead Free Status / RoHS Status: ROHS3 Compliant
Voltage - Supply, Battery 1.5V ~ 3.6V
Voltage - Supply 1.7V ~ 3.6V
Type Clock/Calendar
Time Format HH:MM:SS:hh
Supplier Device Package 16-QFN (3x3)
Series -
Package / Case 16-VFQFN Exposed Pad
Package Tape & Reel (TR)
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Memory Size 256B
Interface I²C, 2-Wire Serial
Features Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer
Date Format YY-MM-DD-dd
Current - Timekeeping (Max) 0.17µA ~ 0.22µA @ 1.8V ~ 3V

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

PayPal:

PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: Info@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

What is the maximum allowable voltage drop on the VCC line during brown-out conditions for the AB1804-T3 to maintain accurate timekeeping and prevent register corruption?
The AB1804-T3 maintains timekeeping accuracy down to 1.7V under VCC supply, but register integrity requires stable operation above 2.0V during write cycles. Sudden voltage dips below 1.8V may cause I²C transaction failures or partial SRAM data loss. Designers should ensure adequate decoupling capacitance and current margin to avoid glitches near this threshold.
Can the AB1804-T3 be used in a system powered solely by a coin cell battery without an external backup source, and what are the long-term drift implications?
Yes, the AB1804-T3 supports primary power from a 1.5V–3.6V supply, including standard CR2032 batteries. However, temperature variations and aging of the internal oscillator can introduce up to ±2 ppm/day drift, leading to cumulative time errors over months. For applications requiring sub-minute monthly accuracy, periodic re-synchronization is recommended.
How does the trickle-charger feature on the AB1804-T3 interact with non-rechargeable lithium batteries, and what configuration avoids damage?
The trickle-charger circuit is designed for rechargeable cells only and must be disabled when using primary lithium batteries like CR2032. Leaving it enabled can overcurrent the battery, causing leakage or thermal stress. Configure the TRICKLE register bits appropriately—typically disable via software—before powering on the backup domain.
What is the minimum clock frequency deviation the AB1804-T3 can tolerate from its internal 32.768 kHz crystal while maintaining calendar functionality?
The AB1804-T3 requires the crystal frequency to remain within ±20 ppm of 32.768 kHz for reliable timekeeping. Deviations beyond this range may cause missed interrupts or incorrect date transitions. Use a high-stability crystal with load capacitance matching the specified C_L (e.g., 12.5 pF typical) and verify startup behavior across the full operating temperature range.
When migrating from an ISL1208 to the AB1804-T3, which pin functions require special attention due to differing electrical characteristics?
While both devices share I²C interface and package compatibility, the AB1804-T3 uses a 1.7V–3.6V logic level range versus the ISL1208’s 2.7V–5.5V tolerance. Direct substitution risks input latch-up if interfacing with 5V microcontrollers without level shifting. Additionally, the AB1804 lacks built-in EEPROM—rely on its 256B SRAM instead, noting that SRAM contents are not retained during power loss unless VBACKUP remains active.
Is it safe to operate the AB1804-T3 continuously at 85°C ambient temperature with VCC = 3.6V, considering long-term reliability and leakage current?
Yes, the AB1804-T3 is qualified for industrial temperatures (-40°C to +85°C) and can operate continuously at 85°C with VCC = 3.6V. However, elevated temperature increases quiescent current slightly; at 85°C, timekeeping current may reach ~0.22 µA. This marginally affects battery life in low-power designs but remains well within typical coin cell capacities over years.
What precautions should be taken when soldering the AB1804-T3 in mass production to avoid popcorning or bond wire damage?
The AB1804-T3 has MSL 1 rating, allowing unlimited floor life, but reflow profiles must comply with JEDEC J-STD-020D1. Peak reflow temperature should not exceed 260°C for 10 seconds or 245°C for 30 seconds. Avoid excessive soak time above 220°C to prevent moisture-induced cracking. Pre-bake is unnecessary unless stored improperly beyond recommended conditions.
Can the alarm and watchdog timer features of the AB1804-T3 coexist in the same application, and how do they affect power consumption?
Yes, the AB1804-T3 supports concurrent operation of the programmable alarm and watchdog timer. Both operate from the main oscillator, drawing negligible additional current beyond baseline timekeeping (~0.2 µA). However, frequent watchdog resets or alarm triggers can increase interrupt traffic to the host MCU, indirectly affecting system-level sleep efficiency.
What happens to the SRAM content if both VCC and VBAT fall below 1.5V simultaneously on the AB1804-T3?
If both VCC and VBAT drop below 1.5V, the AB1804-T3 enters a deep shutdown state where all memory—including the 256-byte SRAM—is lost. Data retention requires either VCC > 1.7V or VBAT > 1.5V. To preserve critical data during brown-outs, implement a capacitor-based hold-up circuit or use non-volatile storage in conjunction with periodic save routines.
Are there any known compatibility issues between the AB1804-T3 and certain I²C pull-up resistor values in noisy industrial environments?
The AB1804-T3 supports standard-mode I²C speeds up to 100 kbps, but in electrically noisy settings, excessively large pull-ups (e.g., >4.7 kΩ) may cause signal rise time degradation and communication errors. Recommended pull-up resistance is 1.8 kΩ to 4.7 kΩ depending on bus capacitance. For longer traces or unshielded cables, consider reducing speed to 10 kbps or adding series termination.

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