PR1990 1-Wire Key IC
CMOS 1-Wire key IC — die or packaged formats are confirmed in the quote.
A CMOS microcircuit carrying a unique 64-bit code — 8-bit family code (01h), 48-bit serial, 8-bit CRC — communicating over the 1-Wire protocol with a single data pin and ground: presence pulse, parasite-powered, zero standby, up to 16.3 kbit/s (per the original manufacturer's datasheet; confirm for the supplied version). It supports ROM Search, so several devices can share one bus, and answers ROM Read as both 33h and 0Fh, where a DS1990 responds only to 0Fh — which may help with some existing readers; test a sample on your own reader before ordering. For OEM projects you can ask about a custom family code instead of 01h or a re-defined CRC rule, so that your controllers accept only your keys: feasibility, MOQ and cost are confirmed in the quote. The supply format (die on wafer, packaged IC or canned button) is also confirmed in the quote.
Ordering information
| MOQ | Confirmed by model and order when quoting |
|---|---|
| Preparation time | Availability and lead time are confirmed by model and order when quoting |
| Packing | Confirm pack quantity, protection and labelling for the selected model. |
| Samples | Sample quantity, fees and shipping are confirmed for the selected model. |
| Payment | Agree payment terms and the payee in the quotation and invoice. |
| Shipping | Confirm the shipping method, cost and timing for your destination and order. |
| Customization | State ROM, colour, marking and packing needs; feasibility and cost require confirmation. |
Key features
- CMOS 1-Wire key silicon carrying a unique 64-bit code in non-volatile memory.
- Answers ROM Read as both 33h and 0Fh (a DS1990 answers only 0Fh), per the original manufacturer's datasheet; confirm for the supplied version. Compatibility depends on your reader, controller and firmware; test a sample on your own system before ordering.
- Supports ROM Search (F0h) for multi-device buses.
- Custom family code (01h → any value) and custom CRC rule for closed systems can be requested: ask us; feasibility, MOQ and cost are confirmed in the quote.
- 2.8–5.25 V, −40 to +85 °C, presence pulse, zero standby power — per the original manufacturer's datasheet; confirm for the supplied version.
- Intended for key manufacturers as an OEM building block; supply form (die on wafer or packaged IC) and quantities are confirmed in the quote.
Specifications
| Chip / compatibility | PR1990 CMOS 1-Wire key IC (datasheet model H4193C) · family code 01h; a custom family code is confirmed in the quote |
|---|---|
| Memory | Unique 64-bit code: 8-bit family + 48-bit serial + 8-bit CRC; a custom CRC rule is confirmed in the quote |
| Protocol | 1-Wire — ROM Read 33h and 0Fh, ROM Search F0h; presence pulse; up to 16.3 kbit/s (per the original manufacturer's datasheet; confirm for the supplied version) |
| Operating temperature | 2.8–5.25 V · −40 to +85 °C · zero standby power (parasite-powered) — per the original manufacturer's datasheet; confirm for the supplied version |
| Package | Supply format confirmed in the quote: die on wafer, packaged IC, or F5-type stainless can (Ø16.2, flange 17.3, h 6.2 mm) |
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.
Typical applications
Frequently asked questions
Can PR1990 be ordered with a custom family code or CRC rule?
A custom family code or CRC rule is not offered by default. If your closed system needs a different 8-bit family code (instead of 01h) or a re-defined CRC rule, send us the requirement and your controller details: feasibility, MOQ, lead time and cost are confirmed in the quote. Treat any custom configuration as unconfirmed until its supply documentation and samples have been checked on your controllers.
In what forms is PR1990 supplied?
Ask us which supply forms are available — die, packaged IC or assembled in an F5-type stainless can; availability, MOQ and cost are confirmed in the quote. Typical figures are 2.8–5.25 V and −40 to +85 °C, with parasitic power from the data line and no separate supply; these are per the chip datasheet, so confirm for the supplied version.