DS1996 64 Kb Memory iButton
The large-memory token — 64 Kb of rewritable NV RAM.
A high-capacity (64 Kb) NV RAM device, suited to access controllers that store event or personnel data on the key itself rather than in the panel. Compatibility depends on your reader, controller and firmware; test a sample on your own system before ordering.
Ordering information
| MOQ | Confirmed by model and order when quoting |
|---|---|
| Preparation time | Availability and lead time are confirmed by model and order when quoting |
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| Customization | State ROM, colour, marking and packing needs; feasibility and cost require confirmation. |
A large memory — 64× the capacity of a DS1992
8 KB on a key ring. At sixty-four times the capacity of a DS1992 and sixteen times a DS1993, the DS1996 stops being a data carrier and becomes a portable database — a full personnel record, a machine's complete calibration set, a route with hundreds of checkpoints, or a firmware payload delivered by hand to equipment with no network. It is still NV RAM, so per the original manufacturer's datasheet rewrites are not limited by EEPROM write cycles, and it fits systems where the credential itself, not the panel, has to hold the event history.
Key features
- Original DS1996 reference: 64 Kbit of nonvolatile memory, arranged in 256-bit pages.
- The original device provides a 256-bit scratchpad and an Overdrive communication mode.
- Battery condition, storage history and the host’s full memory commands matter for replacement; a matching ID alone is insufficient.
Specifications
| Chip / compatibility | DS1996 · family code 0Ch |
|---|---|
| Memory | 64 Kbit (8 KB) battery-backed NV RAM = 256 pages × 256 bits + 256-bit scratchpad; no EEPROM write-cycle limit (per datasheet) |
| Operating temperature | −40 to +70 °C · over 10 years data retention (per the original manufacturer's datasheet; confirm for the supplied version) |
| Package | F5 can |
| Protocol | 1-Wire® |
Inside the stainless can
Typical construction of this can format: a stainless-steel shell, an insulating grommet separating lid from base, and the chip bonded inside. Lid = data contact, base = ground return. Wall thickness, grommet material and other construction details: confirm for the supplied version.
Which memory iButton do you need?
The whole memory range side by side, grouped by storage technology — capacities and family codes per the Analog Devices datasheets.
| Model | Family code | Capacity | Memory technology | Pick it for |
|---|---|---|---|---|
| DS1971 | 14h | 256 bit + 64-bit OTP | EEPROM — battery-free | Asset tag: a locked ID beside rewritable data |
| DS1972 | 2Dh | 1 Kbit (128 B) | EEPROM — battery-free | Per-page write-protect or EPROM-emulation modes |
| DS1973 | 23h | 4 Kbit (512 B) | EEPROM — battery-free | Battery-free rewritable memory (4 Kbit); production travellers |
| DS1982 | 09h | 1 Kbit (128 B) | EPROM — add-only; written data is not erasable (per datasheet) | Add-only records such as checkpoints and certificates |
| DS1985 | 0Bh | 16 Kbit (2 KB) | EPROM — add-only; written data is not erasable (per datasheet) | Append-only service history (16 Kbit) |
| DS1992 / DS1993 | 08h / 06h | 1 Kbit / 4 Kbit | NV RAM — battery-backed, high write endurance (per datasheet) | Data that changes constantly on the key |
| DS1996 | 0Ch | 64 Kbit (8 KB) | NV RAM — battery-backed, high write endurance (per datasheet) | Portable database — 64 Kbit NV RAM |
| DS1994 | 04h | 4 Kbit + RTC | NV RAM + clock, timer, counter, alarms | Time- or usage-limited access with the expiry held in the key |
| DS1904L | 24h | No user memory | Real-time clock only | Give a microcontroller a real-time timebase |
| DS1991 | 02h | 1152 bit = 3 × 384 bit | Secure NV RAM — three password zones | Legacy multi-tenant systems (not for new secure designs) |
| DS1961S | 33h | 1 Kbit + 64-bit secret | EEPROM + SHA-1 challenge–response | Authentication: proves it knows a secret (assess cloning risk for your own system) |
Typical applications
Frequently asked questions
How much data can a DS1996 hold?
64 Kbit (65,536 bits) of rewritable NV RAM, organised as 256 pages of 256 bits — a high-capacity NV RAM iButton that can act as a small rugged portable data store on a key. Per the original manufacturer's datasheet; confirm for the supplied version.
Can the DS1996 be rewritten without wearing out?
Per the original manufacturer's datasheet, yes — it is battery-backed SRAM, so it has no EEPROM-style write-cycle limit and can be rewritten freely. Overdrive mode raises the 1-Wire link to 142 kbit/s for faster reads and writes of the large memory, and the ID stays readable even if the battery depletes; confirm for the supplied version.
Related products
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.
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.