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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
2
3
6
5
4
TOP VIEW
.7 X 4.
X 1.
mm
TSOC PACKAGE
See Mech.
Drawings Section
See Mech.
Drawings Section
TO-92/PR-35
GND
DAT
NC
BOTTOM VIE
See Mech.
Drawings Section
31