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SPECIAL FEATURES
§ 1024 bits, 16 kbits or 64 kbits Electrically
Programmable Read Only Memory (EPROM)
communicates with the economy of one
signal plus ground
§ Unique, factory-lasered and tested 64-bit
registration number (8-bit family code, 36-bit
serialization, 12-bit UniqueWare identifier
5E7H, 8-bit CRC-tester) assures absolute
traceability because no two parts are alike.
§ Built-in multidrop controller ensures
compatibility with other MicroLAN products
§ EPROM partitioned into 256-bit pages for
randomly accessing packetized data records
§ Each memory page can be permanently write-
protected to prevent tampering
§ Device is an “add only” memory where
additional data can be programmed into
EPROM without disturbing existing data
§ Reduces control, address, data, power and
programming signals to a single pin
§ Directly connects to a single port pin of a
microprocessor and communicates at up to
16.3k bits per second
§ Presence detector acknowledges when reader
first applies voltage
§ Low cost TO-92/PR-35 or 8-pin SOIC and
TSOC surface mount packages
§ Reads over a wide voltage range of 2.8V to
6.0V from -40°C to +85°C
PIN ASSIGNMENT
PIN ASSIGNMENT
TO-92/PR-35 TSOC SOIC
Pin 1 Ground Ground NC
Pin 2 Data Data NC
Pin 3 NC NC Data
Pin 4 ----- NC Ground
Pins 5 to 8 ----- NC NC
SILICON LABEL DESCRIPTION
UniqueWare Add-Only Memories are factory programmed versions of the DS2502 (1024 bit), the
DS2505 (16-kbit) and the DS2506 (64k bit) Add-Only Memories, respectively. They differ from the
regular devices in their custom ROM family codes (see Ordering Information) and the UniqueWare
Identifier 5E7 in place of the upper 12 bits of the standard serialization field. For technical details on the
devices please refer to the DS2502, DS2505 and DS2506 data sheets.
UniqueWare Add-Only Memories are only available preprogrammed with customer-specific and write-
protected data. UniqueWare data fills at least one but no more than the first four pages of a device,
DS2502/5/6-UNW
UniqueWareTM Add-Only Memory
www.dalsemi.com
8
7
6
5
1
2
3
4
8-Pin SOIC
1
2
3
6
5
4
TOP VIEW
3.7 X 4.0 X 1.5 mm
TSOC PACKAGE
See Mech.
Drawings Section
See Mech.
Drawings Section
TO-92/PR-35
BOTTOM VIEW
See Mech.
Drawings Section
2
3
1
DS2502/5/6-UNW
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depending on the length of the customer-supplied data. This leaves up to three (DS2502-UNW), 63
(DS2505-UNW) or 255 (DS2506-UNW) memory pages available for programming in the application.
For more details on UniqueWare and how to set up data files, please refer to the UniqueWare Project
Setup Manual, available as Application Note 99 from Dallas Semiconductor. The UniqueWare Project
Setup Software is available from the Dallas Semiconductor FTP Site at
ftp://ftp.dalsemi.com/pub/auto_id, file name "unwsetup.exe."
ORDERING INFORMATION
Memory Size Family Code Package Ordering Part Number
1024 bits 89h TO-92 package DS2502-UNW-pppp
(4 pages) 8-pin 150 mil SOIC pkg. DS2502S-UNW-pppp
6-pin TSOC package DS2502P-UNW-pppp
16k bits 8Bh TO-92 package DS2505-UNW-pppp
(64 pages) 6-pin TSOC package DS2505P-UNW-pppp
64k bits 8Fh PR-35 package DS2506-UNW-pppp
(256 pages) 8-pin 208 mil SOIC pkg. DS2506S-UNW-pppp
pppp stands for the Project ID assigned to each individual data pattern at the time of the first order.
Sample UniqueWare Data Structures
SAMPLE 1: ETHERNET NODE ADDRESS Figure 1a
(unused) CRC16 Company ID Value Extension ID Value Project ID Length
MSB LSB MSB LSB MSB LSB MSB LSB
19 bytes 2 bytes 3 bytes constant 3 bytes serialization 4 bytes 1 byte
FFH assigned by IEEE constant 0AH
high address low address
PHYSICAL ADDRESS AND DATA MAPPING Figure 1b
ADDRESS 0C 0B 0A 09 08 07 06 05 04 03 02 01 00
DATA xx xx ch cm cl hh mm ll 00 00 pp pp 0A
xx xx = CRC16, value depends on actual data
ch cm cl = high, medium and low byte of the IEEE assigned “Company ID”
hh mm ll = high, medium and low byte of the “Extension ID” or serialization
pp pp = Project ID assigned by Dallas Semiconductor
DS2502/5/6-UNW
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SAMPLE 2: EUI-64 FireWireTM NODE ADDRESS Figure 2a
(unused) CRC16 Company ID Value Extension ID Value Project ID Length
MSB LSB MSB LSB MSB LSB MSB LSB
17 bytes 2 bytes 3 bytes constant 5 bytes serialization 4 bytes 1 byte
FFH assigned by IEEE constant 0CH
high address low address
PHYSICAL ADDRESS AND DATA MAPPING Figure 2b
ADDRESS 0E 0D 0C 0B 0A 09 08 07 06 05 04 03 02 01 00
DATA xx xx ch cm cl hh hm mm ml ll 00 00 pp pp 0C
xx xx = CRC16, value depends on actual data
ch cm cl = high, medium and low byte of the IEEE assigned “Company ID”
hh hm mm ml ll = high, medium and low byte of the “Extension ID” or serialization
pp pp = Project ID assigned by Dallas Semiconductor
FireWireTM is a trademark of Apple Computer, Inc.