DS2505
16-kbit Add-Only Memory
www.dalsemi.com
FEATURES
16384 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 1-Wire
Net
products
EPROM partitioned into sixty-four 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
8-bit family code specifies DS2505
communications requirements to reader
Presence detector acknowledges when the
reader first applies voltage
Low cost TO-92 or 6-pin TSOC 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
TO-92
DALLAS
DS2505
TSOC PACKAGE
GND
DATA
NC
1
2
3
6
5
4
NC
NC
NC
Top View
3.7 X 4.0 X 1.5 mm
Side View
See Mech.
Drawing Section
GND
DATA
NC
1 2 3
Bottom View
See Mech.
Drawings Section
ORDERING INFORMATION
DS2505
TO-92 Package
DS2505P
6-pin TSOC Package
DS2505/T&R Tape & Reel version of DS2505
DS2505P/T&R Tape & Reel version of DS2505P
1 of 24
032201
DALLAS [ DALLAS SEMICONDUCTOR ]
