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19-5075; Rev 12/11
DS2502
1Kb Add-Only Memory
FEATURES PIN ASSIGNMENT
1024 bits Electrically Programmable Read
TO-92 NC 1 8 NC
Only Memory (EPROM) communicates with
DS2502 NC 2 7 NC
the economy of one signal plus ground
Unique, factory-lasered and tested 64-bit DATA 3 6 NC
registration number (8-bit family code + 48- GND 4 5 NC
bit serial number + 8-bit CRC tester) assures
8-PIN SO (150 MIL)
absolute traceability because no two parts are
alike TSOC PACKAGE
Built-in multidrop controller ensures GND 1 6 NC
compatibility with other MicroLAN products DATA 2 5 NC
EPROM partitioned into four 256-bit pages NC 3 4 NC
for randomly accessing packetized data TOP VIEW
Each memory page can be permanently
NC
GND
DATA
SOT-23 Package
write-protected to prevent tampering Top View
Device is an "add only" memory where
3
additional data can be programmed into
EPROM without disturbing existing data
1 2 3 09rr
Architecture allows software to patch data by
superseding an old page in favor of a newly 1 2
programmed page BOTTOM VIEW 1 = DATA; 2, 3 = GND
"rr" = Revision
Reduces control, address, data, power, and
programming signals to a single data pin Flip Chip, Top View
Directly connects to a single port pin of a with Laser Mark,
microprocessor and communicates at up to 09rrd Contacts Not Visible.
"rrd" = Revision/Date
16.3 kbits per second 1 = DATA
1 2 2 = GND
8-bit family code specifies DS2502
communications requirements to reader 1 2
Presence detector acknowledges when the SFN PINOUT:
reader first applies voltage PIN 1: IO
Low cost TO-92, SFN, or 8-pin SO, SOT-23 PIN 2: GND
(3-pin), TSOC and flip chip surface mount
package BOTTOM VIEW SIDE VIEW
Reads over a wide voltage range of 2.8V to SFN (APPROX. 6.0mm x 6.0mm x 0.9mm)
6.0V from -40