DS24B33
1-Wire 4Kb EEPROM
General Description Features
The DS24B33 is a 4096-bit, 1-Wire EEPROM orga-
4096 Bits of Nonvolatile EEPROM Partitioned Into
nized as 16 memory pages of 256 bits each. Data is
Sixteen 256-Bit Pages
written to a 32-byte scratchpad, verified, and then
Read and Write Access is Highly Backward-
copied to the EEPROM memory. The DS24B33 commu-
Compatible to the DS2433
nicates over a single-conductor 1-Wire bus. The com-
munication follows the standard 1-Wire protocol. Each
256-Bit Scratchpad with Strict Read/Write
device has its own unalterable and unique 64-bit regis-
Protocols Ensures Integrity of Data Transfer
tration number that is factory programmed into the chip.
Unique, Factory-Programmed, 64-Bit Registration
The registration number is used to address the device
in a multidrop 1-Wire net environment. The DS24B33 is Number Ensures Error-Free Device Selection and
software compatible to the DS2433.
Absolute Part Identity
Switchpoint Hysteresis to Optimize Performance
Applications
in the Presence of Noise
Storage of Calibration Constants
Communicates to Host at 15.4kbps or 125kbps
Board Identification
Using 1-Wire Protocol
Storage of Product Revision Status
Low-Cost Through-Hole and SMD Packages
Operating Range: +2.8V to +5.25V, -40C to +85C
Typical Operating Circuit
IEC 1000-4-2 Level 4 ESD Protection (8kV
Contact, 15kV Air, Typical) for IO Pin
V
CC
R
PUP
Ordering Information
IO
PART TEMP RANGE PIN-PACKAGE
DS24B33+ -40C to +85C TO-92
DS24B33
C
DS24B33+T&R -40C to +85C TO-92
Functional Diagrams
DS24B33G+T&R -40C to +85C 2 SFN (2.5k pcs)
GND
DS24B33Q+T&R -40C to +85C 6 TDFN-EP* (2.5k pcs)
DS24B33S+ -40C to +85C 8 SO (208 mils)
DS24B33S+T&R -40C to +85C 8 SO (208 mils)
Note: The leads of TO-92 packages on tape and reel are formed
to approximately 100-mil (2.54mm) spacing. For details, refer to
the package outline drawing.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
19-5759; Rev 3; 5/12
at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.
AVAILABLEDS24B33
1-Wire 4Kb EEPROM
ABSOLUTE MAXIMUM RATINGS
IO Voltage Range to GND........................................-0.5V to +6V Lead Temperature (soldering, 10s) .................................+300C
IO Sink Current....................................................................20mA Soldering Temperature (reflow)
Operating Temperature Range ...........................-40C to +85C TO-92 ...........................................................................+250C
Junction Temperature......................................................+150C All other packages, excluding SFN .............................+260C
Storage Temperature Range .............................-55C to +125C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(T = -40C to +85C.) (Note 1)
A
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IO PIN: GENERAL DATA
1-Wire Pullup Voltage V (Notes 2, 3) 2.8 5.25 V
PUP
1-Wire Pullup Resistance R (Notes 2, 4) 0.3 2.2 k
PUP
Input Capacitance C (Notes 5, 6) 2000 pF
IO
Input Load Current I IO at V 0.05 5 A
L PUPMAX
V -
PUP
High-to-Low Switching Threshold V (Notes 6, 7, 8) 0.5 V
TL
1.8
Input Low Voltage V (Notes 2, 9) 0.5 V
IL
V -
PUP
Low-to-High Switching Threshold V (Notes 6, 7, 10) 1.0 V
TH
1.0
Switching Hysteresis V (Notes 6, 7, 11) 0.2 1.7 V
HY
Output Low Voltage V At 4mA (Note 12) 0.4 V
OL
Standard speed 5
Overdrive speed 2
Recovery Time
t V +4.5V 1 s
REC PUP
(Notes 2, 13)
Directly prior to reset pulse 640s 5
Directly prior to reset pulse > 640s 10
Standard speed 65
Standard speed, V +4.5V 61
Time-Slot Duration PUP
t s
SLOT
(Notes 2, 14)
Overdrive speed 8
Overdrive speed, V +4.5V 7
PUP
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Standard speed, t before reset = 10s 480 960
REC
Reset Low Time
t s
RSTL Standard speed, t before reset = 5s 480 640
REC
(Note 2)
Overdrive speed 48 80
Standard speed 15 60
Presence-Detect High Time t s
PDH
Overdrive speed 2 6
Standard speed 60 240
Presence-Detect Low Time t s
PDL
Overdrive speed 8 24
Standard speed 60 75
Presence-Detect Sample Time
t s
MSP
(Notes 2, 15)
Overdrive speed 6 10
2 Maxim Integrated