Status
Description
The DS1904 RTC iButton® is a rugged real-time clock module that can be accessed with minimal hardware. Data is transferred serially by the 1-Wire® protocol, which requires only a single data lead and a ground return. The DS1904 contains a unique 64-bit factory-lasered ROM and a real-time clock/calendar implemented as a binary counter. The durable MicroCan® package is highly resistant to environmental hazards such as dirt, moisture, and shock. Accessories permit the DS1904 to be mounted on almost any surface including printed circuit boards and plastic key fobs. The DS1904 adds functions such as calendar, time and date stamp, stopwatch, hour meter, interval timer, and logbook to any type of electronic device or embedded application that uses a microcontroller.
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Data Sheet
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This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.
Key Features
- Real-time clock/calendar in binary format
- Uses the same binary time/date representation as the DS1994 but with 1 second resolution
- Clock accuracy is better than ± 2 minutes per month at +25°C
- Operating temperature range from -40°C to +70°C
- Over 10 years of operation
- Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
- Multidrop controller for MicroLAN
- Digital identification and information by momentary contact
- Chip-based data carrier compactly stores information
- Data can be accessed while affixed to object
- Economically communicates to host with a single digital signal at 16.3kbits per second
- Standard 16mm diameter and 1-Wire protocol ensure compatibility with iButton device family
- Button shape is self-aligning with cup-shaped probes
- Durable stainless steel case engraved with registration number withstands harsh environments
- Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
- Presence detector acknowledges when reader first applies voltage
- Meets UL 913, 5th Ed., Rev. 1997-02-24; Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations
- Underwriters Laboratories (UL) Recognized
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Key Specifications:
| iButton Products |
| Part Number |
Applications |
Memory Type |
Memory Size |
Unique Ware |
Real Time Clock |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max w/pins |
See Notes |
| DS1904 |
Asset Management |
ROM Only |
64 bits |
No |
Yes |
301 |
$3.14 @1k |
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See All iButton Products (26)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Application Notes
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Notes |
Free
Sample |
Buy |
Status
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Recommended Replacement |
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS1904L-F5
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F5 MicroCan |
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N/A |
No Longer Available |
DS1904L-F5#
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CAN;
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| DS1904L-F5#
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Active |
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CAN-F5;2 pin;301 mm²
Outline Drawing:21-0266 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: IB#5CB*
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Special - See Data Sheet
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RoHS/Lead-Free: RoHS Qualified
Materials Analysis |
| DS1904L-F5+
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N/A |
No Longer Available |
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CAN-F5;2 pin;301 mm²
Outline Drawing:21-0266 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: IB+5CW*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-4864
Rev 3;
2011-04-27
This page last modified: 2011-04-27
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