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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 -40C to +85C
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
UniqueWare
TM
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
GND
DATA
NC
BOTTOM VIEW
See Mech.
Drawings Section
2 3
1
DS2502/5/6-UNW
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102099
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 FireWire
TM
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
FireWire
TM
is a trademark of Apple Computer, Inc.
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