Product Information


Product Image X-ON

Maxim Integrated iButtons RTC iButton
Manufacturer: Analog Devices

Price (USD)

1: USD 28.112 ea
Line Total: USD 28.112

1756 - Global Stock
Ships to you between
Fri. 31 Mar to Thu. 06 Apr
MOQ: 1 Multiples:1
Pack Size :   1
Availability Price Quantity
3487 - Global Stock

Ships to you between Fri. 31 Mar to Thu. 06 Apr

MOQ : 1
Multiples : 1

Stock Image

Analog Devices

1 : USD 27.244
10 : USD 24.1394
25 : USD 23.1395
100 : USD 20.3877
250 : USD 19.3871
500 : USD 18.7617

Analog Devices
Product Category
iButtons & Accessories
0 Icon ROHS
Analog Devices
Factory Pack Quantity :
Show Stocked Products With Similar Attributes. LoadingGif
Image Description
Stock Image DS1921G-F5
Maxim Integrated iButtons Thermochron iButton
Stock : 0
Stock Image DS1921K#
Temperature Sensor Development Tools Eval Kit DS1921 (Thermochron iButton Starter Kit)
Stock : 0
Stock Image DS1920-F5+
iButtons & Accessories Temperature iButton
Stock : 0
Stock Image DS1921Z-F5#
iButtons & Accessories High Resolution Thermochron iButton Range H: +15 C to +46 C; Z: -5 C to +26 C
Stock : 0
Stock Image DS1904L-F5#
iButtons & Accessories RTC iButton
Stock : 0
Stock Image DS1921G-F5#
iButtons & Accessories Thermochron iButton
Stock : 0
Stock Image DS1921H-F5#
iButtons & Accessories High Resolution Thermochron iButton Range H: +15 C to +46 C; Z: -5 C to +26 C
Stock : 0
Stock Image DS1922E-F5#
iButtons & Accessories High-Temperature Logger iButton with 8KB Data-Log Memory
Stock : 0
Stock Image DS1921G-F5N#
iButtons & Accessories Thermochron iButton
Stock : 0
Image Description
Stock Image DS1995L-F5+
iButtons & Accessories 16Kb Memory iButton
Stock : 0
Stock Image DS1993L-F5+
iButtons & Accessories 1Kb/4Kb Memory iButton
Stock : 0
Stock Image DS1985-F3
Maxim Integrated iButtons 16Kb Add-Only iButton
Stock : 0
Stock Image DS1982-F5+
iButtons & Accessories 1Kb Add-Only iButton
Stock : 0
Stock Image DS1977-F5
Maxim Integrated iButtons Password-Protected 32KB EEPROM iButton
Stock : 0
Stock Image DS1972-F3+
iButtons & Accessories 1024-Bit EEPROM iButton
Stock : 0
Stock Image DS1971-F3+
iButtons & Accessories 256-Bit EEPROM iButton
Stock : 0
Stock Image DS1925L-F5#
iButtons & Accessories THERMOCHRON,IBUTTON, F5 CAN ,HI-RES,64K
Stock : 0
Stock Image DS1920-F5+
iButtons & Accessories Temperature iButton
Stock : 0

DS1904 RTC iButton SPECIAL FEATURES Easily affixed with self-stick adhesive back- Real-Time Clock/calendar in binary format ing, latched by its flange, or locked with a Uses the same binary time/date representation ring pressed onto its rim as the DS1994 but with 1 second resolution Presence detector acknowledges when reader Clock accuracy is better than 2 minutes per first applies voltage month at 25C Operating temperature range from -40C to F5 MicroCan +85C Over 10 years of operation 5.89 0.51 COMMON iButton FEATURES Unique, factory-lasered and tested 64-bit 16.25 registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) 40 24 17.35 assures absolute traceability because no two 000000FBC52B 1-Wire parts are alike Multidrop controller for MicroLAN Digital identification and information by momentary contact IO GND Chip-based data carrier compactly stores in- formation All dimensions are shown in millimeters Data can be accessed while affixed to object Economically communicates to host with a ORDERING INFORMATION single digital signal at 16.3 kbps DS1904L-F5 F5 MicroCan Standard 16 mm diameter and 1-Wire Denotes an RoHS-compliant device that may include protocol ensure compatibility with iButton lead(Pb) that is exempt under the RoHS requirements. Device family Button shape is self-aligning with cup-shaped EXAMPLES OF ACCESSORIES probes DS9096P Self-Stick Adhesive Pad Durable stainless steel case engraved with DS9101 Multi-Purpose Clip registration number withstands harsh envi- DS9093RA Mounting Lock Ring ronments DS9093A Snap-In Fob DS9092 iButton Probe iButton DESCRIPTION The DS1904 RTC iButton is a rugged real-time clock module that can be accessed with minimal hardware. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a 1-Wire and iButton are registered trademarks of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 19-4864 Rev 6/13 1-888-629-4642, or visit Maxim Integrateds website at 1 of 13 DS1904 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. OVERVIEW The DS1904 has two main data components: 1) 64-bit lasered ROM, and 2) real-time clock counter (Figure 1). The real-time clock utilizes an on-chip oscillator that is connected to a 32.768 kHz crystal. The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide one of four ROM function commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM. The protocol for these ROM functions is described in Figure 7. After a ROM function command is successfully executed, the real-time clock functions become accessible and the master may then provide one of the real-time clock function commands. The protocol for these commands is described in Figure 5. All data is read and written least significant bit first. BLOCK DIAGRAM Figure 1 ROM 64-BIT LID DATA FUNCTION LASERED CONTACT CONTROL ROM CLOCK FUNCTION CONTROL READ/WRITE BUFFER 3V 1 Hz RTC COUNTER (32-BIT) LITHIUM 32.768 kHz OSCILLATOR DIVIDER CONTROL OSCILLATOR 64-BIT LASERED ROM Each DS1904 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family code. The next 48 bits are a unique serial number. The last eight bits are a CRC of the first 56 bits (see Figure 3). The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and 8 5 4 XOR gates as shown in Figure 4. The polynomial is X + X + X + 1. Additional information about the Maxim 1-Wire Cyclic Redundancy Check is available in Application Note 937: Book of iButton Standards. The shift register bits are initialized to zero. Then starting with the least significant bit of the family code, one bit at a time is shifted in. After the 8th bit of the family code has been entered, then the serial number is entered. After the 48th bit of the serial number has been entered, the shift register contains the CRC value. Shifting in the eight bits of CRC should return the shift register to all zeros. The 64-bit ROM and ROM Function Control section allow the DS1904 to operate as a 1-Wire device and follow the 1-Wire protocol detailed in the 1-Wire Bus System section. 2 of 13

Tariff Desc

8542.32.00 33 No ..Memory cards (other than "smart" cards and SIMM), which incorporate E2PROM, SRAM, DRAM or flash memory (for example, for PCMCIA applications)
Analog Devices Hittite
Analog Devices / Hittite
Analog Devices / Linear Technology
Analog Devices Inc
Analog Devices Inc.
Analog Devices, Inc.
Dallas Semiconductor (VA)
Linear Technology
Linear Technology (part of ADI)
Maxim Integrated
Maxim Integrated Products
Trinamic Motion Control
Trinamic Motion Control GmbH