Product introduction
DS1971 
256-bit Electrically Erasable Programmable Read Only Memory (EEPROM) communicates with the economy of one signal plus ground
EEPROM organized as one 256-bit page
64-bit one-time programmable application register is automatically write-protected after programming
Reduces control, address, data, power, and programming signals to a single data pin
8-bit family code specifies DS1971 communications requirements to reader
Reads and writes over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C

DS1991L-F5
Safe and reliable 1152 read/write, non-volatile memory
If 64 a password is not match, then security memory will not be decoded
Memory is divided into three partitions, each partition contains 384 bits
Each partition has 64 a password and identification number
512 temporary device to ensure the integrity of the data transfer
Working temperature range:-40 ° C 70 ° C to +
Data can be keep 10 years

TM/DS1990 A-F5 
Consists of a factory-lasered, 64-bit ROM that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (01h). Data is transferred serially via the 1-Wire® protocol that requires only a single data lead and a ground return. Power for reading and writing the device is derived from the data line itself with no need for an external power source
Operating temperature range: - 40 ° C to + 70 ° C control

TM1990D-F5
Memory 64 bit, read only, each chip unique serial number, do not copy, and the encapsulation add have outer ring, like a ring, a special place for the convenient use
Operating temperature range: - 40 ° C to + 70 ° C control

RW1990
Write on card, can write 64 bit, no additional password  
Operating temperature range: - 40 ° C to + 70 ° C control
 
Type: 1990 a - F5 ring card
Memory 64 bit, read only, each chip unique serial number, do not copy, encapsulation: TM1990A - F5 + handle + beads
Operating temperature range: - 40 ° C to + 70 ° C control