DS28EC20
20Kb 1-Wire EEPROM
GENERAL DESCRIPTION
FEATURES
The DS28EC20 is a 20480-bit, 1-Wire® EEPROM
organized as 80 memory pages of 256 bits each. An
additional page is set aside for control functions.
Data is written to a 32-byte scratchpad, verified, and
then copied to the EEPROM memory. As a special
feature, blocks of eight memory pages can be write
protected or put in EPROM-Emulation mode, where
bits can only be changed from a 1 to a 0 state. The
DS28EC20 communicates over the single-conductor
1-Wire bus. The communication follows the standard
1-Wire protocol. Each device has its own unalterable
and unique 64-bit ROM registration number. The
registration number is used to address the device in
a multidrop 1-Wire net environment.
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20480 Bits of Nonvolatile (NV) EEPROM
Partitioned into Eighty 256-Bit Pages
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Individual 8-Page Groups of Memory Pages
(Blocks) can be Permanently Write Protected or
Put in OTP EPROM-Emulation Mode ("Write to 0")
Read and Write Access Highly Backward-
Compatible to Legacy Devices (e.g., DS2433)
256-Bit Scratchpad with Strict Read/Write
Protocols Ensures Integrity of Data Transfer
200k Write/Erase Cycle Endurance at +25°C
Unique Factory-Programmed 64-Bit Registration
Number Ensures Error-Free Device Selection
and Absolute Part Identity
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Switchpoint Hysteresis and Filtering to Optimize
Performance in the Presence of Noise
Communicates to Host at 15.4kbps or 90kbps
Using 1-Wire Protocol
APPLICATIONS
Device Authentication
IEEE 1451.4 Sensor TEDS
Ink/Toner Cartridges
Medical Sensors
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Low-Cost TO-92 Package
Operating Range: 4V to 5.25V, -40°C to +85°C
Operating Range: 3.135V to3.465V,
0°C to +70°C (Standard Speed only)
PCB Identification
Wireless Base Stations
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IEC 1000-4-2 Level 4 ESD Protection (±8kV
Contact, ±15kV Air, Typical) for I/O Pin
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
PIN CONFIGURATION
DS28EC20+
DS28EC20+T
DS28EC20P+
DS28EC20P+T
DS28EC20Q+T
3 TO-92
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
3 TO-92, T&R
6 TSOC
6 TSOC, T&R
6 TDFN, T&R
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TYPICAL OPERATING CIRCUIT
VCC
RPUP (300Ω
to 2.2kΩ)
PX.Y
I/O
DS28EC20
GND
µC
Commands, bytes, and modes are capitalized for clarity.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
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19-6067; Rev 8; 6/21