DS2506
64-kbit Add-Only Memory
www.dalsemi.com
FEATURES
65536 bits 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 +
48-bit serial number + 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 two hundred fifty six
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
Architecture allows software to patch data by
superseding an old page in favor of a newly
programmed page
Reduces control, address, data, power, and
programming signals to a single data pin
Directly connects to a single port pin of a
microprocessor and communicates at up to
16.3 kbits per second
Overdrive mode boosts communication speed
to 142 kbits per second
8-bit family code specifies DS2506
communications requirements to reader
Presence detector acknowledges when the
reader first applies voltage
Low cost PR35 or 8-pin SOIC surface mount
package
Reads over a wide voltage range of 2.8V to
6.0V from -40°C to +85°C; programs at
11.5V to 12.0V from -40°C to +50°C
PIN ASSIGNMENT
PR-35
DALLAS
DS2506
NC
NC
DATA
GND
1
2
3
4
8
7
6
5
NC
NC
NC
NC
8-PIN SOIC
(208 mil)
GND
1 2 3
Bottom View
See Mech.
Drawings Section
ORDERING INFORMATION
DS2506
DS2506S
PR35 Package
8-Pin SOIC Package
1 of 25
DATA
NC
062100
DALLAS [ DALLAS SEMICONDUCTOR ]
