Memory iButtons
NV RAM / EEPROM devices from 1 Kb to 64 Kb, including SHA-1 authentication parts.
DS1991 MultiKey iButton
Three password-protected 384-bit subkeys in one button.
DS1992 / DS1993 Memory iButton
1 Kb and 4 Kb NV RAM tokens for carrying data on the key.
DS1996 64 Kb Memory iButton
The large-memory token — 64 Kb of rewritable NV RAM.
DS1961S SHA-1 Authentication iButton
1 Kb EEPROM with on-chip SHA-1 challenge–response.
DS1971 EEPROM iButton
256-bit EEPROM — non-volatile without a battery.
DS1982 Add-Only iButton
1 Kb add-only EPROM for records that should not be altered.
DS1904L Real-Time Clock iButton
A hardware clock on a key — a 32-bit seconds counter read over 1-Wire.
DS1972 1 Kbit EEPROM iButton
Rewritable 1 Kbit EEPROM with per-page write-protect — no battery.
DS1973 4 Kbit EEPROM iButton
4 Kbit rewritable EEPROM with 142 kbit/s Overdrive — no battery.
DS1985 16 Kbit Add-Only EPROM iButton
16 Kbit add-only EPROM for append-only records that should not be altered.
DS1994 4 Kbit NV RAM + RTC iButton
Memory plus a clock, interval timer, cycle counter and alarms in one token.
Not sure which model fits?
Tell us the panel, intercom or lock you need to work with — send the model or a photo and we will help identify the part. Sample terms are confirmed by model.