DS1961S-F5+ by Analog Devices

iButton 1Kb EEPROM with SHA-1 Engine

Status: Active
Series: DS1961S
RoHS: Unknown
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The DS1961S combines 1024 bits of EEPROM, a 64-bit secret, an 8-byte register/control page with up to five user read/write bytes, a 512-bit SHA-1 engine and a fully featured 1-Wire® interface in a rugged iButton® device. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return. The DS1961S has an additional memory area called the scratchpad that acts as a buffer when writing to the main memory, the register page or when installing a new secret. Data is first written to the scratchpad from where it can be read back. After the data has been verified, a copy scratchpad command will transfer the data to its final memory location, provided that the DS1961S receives a matching 160-Bit message authentication code (MAC). The computation of the MAC involves the secret and additional data stored in the DS1961S including the device's Identity Register. Only a new secret can be loaded without providing a MAC. The SHA-1 engine can also be activated to compute 160-bit MAC when reading a memory page or to compute a new secret, instead of loading it. The DS1961S understands a unique command "Refresh Scratchpad." Proper use of a refresh sequence (see Writing with Verification section) after a copy scratchpad operation reduces the number of weak bit failures in a touch environment. The refresh sequence also provides a means to restore functionality in a device with bits in a weak state. Each DS1961S has its own 64-bit ROM registration number that is factory lasered into the chip to provide a guaranteed unique identity for absolute traceability. The durable stainless steel package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS1961S to be easily used by human operators. Accessories permit the DS1961S to be mounted on almost any surface including plastic key fobs and photo-ID badges.

Prices starting from US$4.70


Distributor Starting From Stock
Logo for element14 element14 US$5.70
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Logo for Newark Electronics Newark Electronics US$4.70
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Features

1128 bits of 5V EEPROM memory partitioned into four pages of 256 bits, a 64-bit write-only secret and up to five general purpose read/write registers
Write access requires knowledge of the secret and the capability of computing and transmitting a 160-bit MAC as authorization
Secret and data memory can be write-protected (all or page 0 only) or put in EPROM-emulation mode ("write to 0", page 1)
On-chip 512-bit SHA-1 engine to compute 160-bit MAC and to generate secrets
Reads and writes over a wide voltage range of 2.8V to 5.25V from -40°C to +85°C
Communicates to host with a single digital signal at 14.1kb per second using 1-Wire protocol
On-chip 16-bit CRC generator for safeguarding data transfers
Overdrive mode boosts communication speed to 125kbps
Operating temperature range from -40°C to +85°C
Minimum 10 years of data retention at 85°C
Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
Multidrop controller for 1-Wire net
Digital identification and information by momentary contact
Chip-based data carrier compactly stores information
Data can be accessed while affixed to object
Button shape is self-aligning with cup-shaped probes
Durable stainless steel case engraved with registration number withstands harsh environments
Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
Presence detector acknowledges when reader first applies voltage

Specifications

Technology iButton
End Equipment Electronic Access ControleCash
Memory Type EEPROM
Memory Size 1K bits
Security Features SHA-1Write-Only Secrets
Unique Ware No
Real Time Clock No
BudgetaryPrice (See Notes) 2.87


DS1961S-F5+ Memory by Analog Devices

IC EEPROM

Status: Unknown
Series: -
RoHS: Unknown
View Datasheet Manufacturer Site View Pricing & Stock

Specifications

Memory Interface Type Serial 1-Wire
Memory Size 1Kbit
EEPROM Memory Configuration -
Clock Frequency -
Memory Case Style Micro Can
No. of Pins 2Pins
Supply Voltage Min 2.8V
Supply Voltage Max 5.25V
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
IC Interface Type Serial 1-Wire

Alternative Descriptions

IC, EEPROM | element14
Memory Configuration:- | Newark Electronics

Frequently Asked Questions

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Is the DS1961S-F5+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for DS1961S-F5+ have stock available?

Authorised distributors including element14, Farnell and Newark Electronics have stock available or on a lead time for DS1961S-F5+ .

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