DS2502_11 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 1Kb Add-Only Memory

19-5075; Rev 12/11
FEATURES
 1024 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 four 256-bit pages
for randomly accessing packetized data
 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 DS2502
communications requirements to reader
 Presence detector acknowledges when the
reader first applies voltage
 Low cost TO-92, SFN, or 8-pin SO, SOT-23
(3-pin), TSOC and flip chip 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
DS2502
1Kb Add-Only Memory
PIN ASSIGNMENT
TO-92
DS2502
NC 1
NC 2
DATA 3
GND 4
8 NC
7 NC
6 NC
5 NC
12 3
BOTTOM VIEW
8-PIN SO (150 MIL)
TSOC PACKAGE
GND 1
DATA 2
NC 3
6 NC
5 NC
4 NC
TOP VIEW
SOT-23 Package
Top View
3
09rr
1
2
1 = DATA; 2, 3 = GND
“rr” = Revision
09rrd
1
2
12
Flip Chip, Top View
with Laser Mark,
Contacts Not Visible.
“rrd” = Revision/Date
1 = DATA
2 = GND
SFN PINOUT:
PIN 1: IO
PIN 2: GND
BOTTOM VIEW SIDE VIEW
SFN (APPROX. 6.0mm x 6.0mm x 0.9mm)
NOTE: THE SFN PACKAGE IS QUALIFIED FOR ELECTRO-MECHANICAL
CONTACT APPLICATIONS ONLY, NOT FOR SOLDERING. FOR MORE
INFORMATION, REFER TO APPLICATION NOTE 4132: ATTACHMENT
METHODS FOR THE ELECTRO-MECHANICAL SFN PACKAGE.
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