A Contact Based Alternative to RFID
The feature set and implementation simplicity of 1-Wire memory products provide an attractive alternative to RFID devices or solutions in a range of end applications. Each 1-Wire device is factory programmed with a unique 64-bit ROM value and multiple device types provide options on memory type, density, security and durability. The single contact 1-Wire interface can be easily implemented from a spare controller port pin making the implementation cost minimal.
1-Wire Device Advantages over RFID:
- Cost competitive
- Host interface cost and technical complexity are significantly reduced
- System implementation complexity is significantly reduced: no antennas, no interference or collision issues, no open-air eavesdropping security problem
| Part |
64-bit
ROM |
Memory
Type |
Memory Size |
Security |
SMT Packages |
| DS2401 |
 |
n/a |
n/a |
|
6-TSOC, CSP |
| DS2411 |
|
n/a |
n/a |
|
6-TSOC, SOT-23, FlipChip |
| DS2431 |
|
EEPROM |
1kb |
WP |
6-TSOC, CSP |
| DS2432 |
|
EEPROM |
1kb |
SHA-1 |
6-TSOC, FlipChip |
| DS2433 |
|
EEPROM |
4kb |
|
SO8, FlipChip |
| DS2502, DS2505, DS2506 |
|
EPROM |
1k, 16k, 64kb |
WP |
6-TSOC, SOT-23, CSP |
iButton Advantages over RFID:
- Durability of tags
- Durability of handheld iButton readers
- Cost competitive
- Host interface cost and technical complexity are significantly reduced
- System implementation complexity is significantly reduced: no antennas, no interference or collision issues, no open-air eavesdropping security problem
| Part |
64-bit
ROM |
Memory
Type |
Memory Size |
Features |
iButton Packages |
| DS1990A |
|
n/a |
n/a |
|
F3, F5 |
| DS1971 |
|
EEPROM |
256 bits |
WP |
F3, F5 |
| DS1973 |
|
EEPROM |
4kb |
|
F3, F5 |
| DS1977 |
|
EEPROM |
32 bytes |
Password |
F5 |
| DS1982 |
|
EPROM |
1kb |
WP |
F3, F5 |
| DS1985 |
|
EPROM |
16kb |
WP |
F3, F5 |
| DS1992 |
|
NV RAM |
1kb |
|
F5 |
| DS1993 |
|
NV RAM |
4kb |
|
F5 |
| DS1995 |
|
NV RAM |
16kb |
|
F5 |
| DS1996 |
|
NV RAM |
64kb |
|
F5 |
| DS1961S |
|
EEPROM |
1kb |
SHA-1 |
F3, F5 |
| DS1963S |
|
NV RAM |
4kb |
SHA-1 |
F5 |
Table Legend:
WP: software selectable write-protection
SHA-1: Secure Hash Algorithm (www.itl.nist.gov/fipspubs/fip180-1.htm), ISO/IEC 10118-3
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