DS28E22P [MAXIM]
1-Wire SHA-256 Secure Authenticator with 2Kb User EEPROM; 的1-Wire SHA- 256安全身份验证与2Kb的用户EEPROM
| 型号： | DS28E22P |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1-Wire SHA-256 Secure Authenticator with 2Kb User EEPROM |
| 文件： | 总6页 (文件大小：799K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ABRIDGED DATA SHEET
EVALUATION KIT AVAILABLE
DS28E22
1-Wire SHA-256 Secure Authenticator
with 2Kb User EEPROM
General Description
Features
The DS28E22 combines crypto-strong, bidirectional,
secure challenge-and-response authentication func-
tionality with an implementation based on the FIPS
180-3-specified Secure Hash Algorithm (SHA-256). A
2Kb user-programmable EEPROM array provides non-
volatile storage of application data and additional pro-
tected memory holds a read-protected secret for SHA-
256 operations and settings for user memory control.
Each device has its own guaranteed unique 64-bit
ROM identification number (ROM ID) that is factory pro-
grammed into the chip. This unique ROM ID is used as
a fundamental input parameter for cryptographic opera-
tions and also serves as an electronic serial number
within the application. A bidirectional security model
enables two-way authentication between a host system
and slave-embedded DS28E22. Slave-to-host authenti-
cation is used by a host system to securely validate that
an attached or embedded DS28E22 is authentic. Host-
to-slave authentication is used to protect DS28E22 user
memory from being modified by a nonauthentic host. The
SHA-256 message authentication code (MAC), which the
DS28E22 generates, is computed from data in the user
memory, an on-chip secret, a host random challenge,
and the 64-bit ROM ID. The DS28E22 communicates
S Symmetric Key-Based Bidirectional Secure
Authentication Model Based on SHA-256
S Dedicated Hardware-Accelerated SHA Engine for
Generating SHA-256 MACs
S Strong Authentication with a High Bit Count, User-
Programmable Secret, and Input Challenge
S 2048 Bits of User EEPROM Partitioned Into 8
Pages of 256 Bits
S User-Programmable and Irreversible EEPROM
Protection Modes Including Authentication, Write
and Read Protect, and OTP/EPROM Emulation
S Unique, Factory-Programmed 64-Bit Identification
Number
S Single-Contact 1-Wire Interface Communicates
with Host at Up to 76.9kbps
S Operating Range: 3.3V 10%, -40NC to +85NC
S Low-Power 5µA (typ) Standby
S
8kV Human Body Model ESD Protection (typ)
S 6-Pin TDFN, 6-Lead TSOC Packages
Typical Application Circuit
M
over the single-contact 1-Wire bus at overdrive speed.
The communication follows the 1-Wire protocol with the
ROM ID acting as node address in the case of a multiple-
device 1-Wire network.
3.3V
R
P
R
= 1.1kΩ
P
V
CC
2
MAXIMUM I C BUS CAPACITANCE 320pF
SDA
SCL
Applications
2
(I C PORT)
DS2465
Authentication of Network-Attached Appliances
Printer Cartridge ID/Authentication
µC
1-Wire LINE
SLPZ
IO
Reference Design License Management
System Intellectual Property Protection
DS28E22
Sensor/Accessory Authentication and Calibration
Secure Feature Setting for Configurable Systems
Key Generation and Exchange for Cryptographic
Systems
Ordering Information appears at end of data sheet.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/DS28E22.related
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
219-0020; Rev 0; 9/12
ABRIDGED DATA SHEET
DS28E22
1-Wire SHA-256 Secure Authenticator
with 2Kb User EEPROM
ABSOLUTE MAXIMUM RATINGS
IO Voltage Range to GND...................................... -0.5V to 4.0V
IO Sink Current...................................................................20mA
Operating Temperature Range ......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -55NC to +125NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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 = -40NC to +85NC, unless otherwise noted.) (Note 1)
A
PARAMETER
IO PIN: GENERAL DATA
1-Wire Pullup Voltage
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
R
(Note 2)
= 3.3V Q10% (Note 3)
2.97
300
3.63
V
PUP
1-Wire Pullup Resistance
Input Capacitance
V
1500
I
PUP
PUP
C
(Notes 4, 5)
IO pin at V
1500
5
pF
FA
IO
Input Load Current
I
19.5
0.3
L
PUP
0.65 x
High-to-Low Switching Threshold
Input Low Voltage
V
(Notes 6, 7)
(Notes 2, 8)
(Notes 6, 9)
(Notes 6, 10)
V
V
V
TL
V
PUP
V
IL
0.75 x
Low-to-High Switching Threshold
V
TH
V
PUP
Switching Hysteresis
Output Low Voltage
Recovery Time
V
V
0.3
V
V
HY
I
= 4mA (Note 11)
0.4
OL
OL
t
R
= 1500I (Notes 2, 12)
5
Fs
Fs
REC
PUP
Time-Slot Duration
t
(Notes 2, 13)
13
SLOT
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Reset Low Time
t
(Note 2)
48
48
8
80
10
Fs
Fs
Fs
RSTL
Reset High Time
t
(Note 14)
(Notes 2, 15)
RSTH
Presence-Detect Sample Time
IO PIN: 1-Wire WRITE
Write-Zero Low Time
Write-One Low Time
IO PIN: 1-Wire READ
Read Low Time
t
MSP
t
t
(Notes 2, 16)
(Notes 2, 16)
8
1
16
2
Fs
Fs
W0L
W1L
t
(Notes 2, 17)
(Notes 2, 17)
1
Fs
Fs
2 - d
RL
Read Sample Time
EEPROM
t
2
t
+ d
MSR
RL
Programming Current
I
t
V
= 3.63V (Notes 5, 18)
1
mA
ms
PROG
PUP
Programming Time for a 32-Bit
Segment
(Note 19)
10
PROG
Write/Erase Cycling Endurance
Data Retention
N
T
T
= +85NC (Notes 20, 21)
100k
10
—
CY
A
A
t
= +125NC (storage) (Notes 22, 23, 24)
Years
DR
Maxim Integrated
2
ABRIDGED DATA SHEET
DS28E22
1-Wire SHA-256 Secure Authenticator
with 2Kb User EEPROM
ELECTRICAL CHARACTERISTICS (continued)
(T = -40NC to +85NC, unless otherwise noted.) (Note 1)
A
PARAMETER
SHA-256 ENGINE
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Computation Current
Computation Time
I
t
mA
ms
CSHA
CSHA
Refer to the full data sheet.
Note 1: Limits are 100% production tested at T = +25°C and/or T = +85°C. Limits over the operating temperature range and
A
A
relevant supply voltage range are guaranteed by design and characterization. Typical values are not guaranteed.
Note 2: System requirement.
Note 3: Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system and 1-Wire recovery
times. The specified value here applies to systems with only one device and with the minimum 1-Wire recovery times.
Note 4: Typical value represents the internal parasite capacitance when V
is first applied. Once the parasite capacitance is
PUP
charged, it does not affect normal communication.
Note 5: Guaranteed by design and/or characterization only; not production tested.
Note 6: V , V , and V are a function of the internal supply voltage, which is a function of V , R , 1-Wire timing, and
PUP PUP
TL TH
HY
capacitive loading on IO. Lower V
, higher R
, shorter t
, and heavier capacitive loading all lead to lower values
PUP
PUP
REC
of V , V , and V
.
TL TH
HY
Note 7: Voltage below which, during a falling edge on IO, a logic-zero is detected.
Note 8: The voltage on IO must be less than or equal to V at all times when the master is driving IO to a logic-zero level.
ILMAX
Note 9: Voltage above which, during a rising edge on IO, a logic-one is detected.
Note 10: After V is crossed during a rising edge on IO, the voltage on IO must drop by at least V to be detected as logic-zero.
TH
HY
Note 11: The I-V characteristic is linear for voltages less than 1V.
Note 12: Applies to a single device attached to a 1-Wire line.
Note 13: Defines maximum possible bit rate. Equal to 1/(t
+ t
).
W0LMIN
RECMIN
Note 14: An additional reset or communication sequence cannot begin until the reset high time has expired.
Note 15: Interval after t during which a bus master can read a logic 0 on IO if there is a DS28E22 present. The power-up pres-
RSTL
ence detect pulse could be outside this interval, but will be complete within 2ms after power-up.
Note 16: ε in Figure 11 represents the time required for the pullup circuitry to pull the voltage on IO up from V to V . The actual
IL
TH
maximum duration for the master to pull the line low is t
+ t - ε and t
+ t - ε, respectively.
W1LMAX
F
W0LMAX F
Note 17: d in Figure 11 represents the time required for the pullup circuitry to pull the voltage on IO up from V to the input-high
IL
RLMAX
threshold of the bus master. The actual maximum duration for the master to pull the line low is t
+ t .
F
Note 18: Current drawn from IO during the EEPROM programming interval or SHA-256 computation. The pullup circuit on IO dur-
ing the programming and computation interval should be such that the voltage at IO is greater than or equal to V
.
PUPMIN
A low-impedence bypass of R
requirement.
activated during programming and computation is the recommended way to meet this
PUP
Note 19: Refer to the full data sheet.
Note 20: Write-cycle endurance is tested in compliance with JESD47G.
Note 21: Not 100% production tested; guaranteed by reliability monitor sampling.
Note 22: Data retention is tested in compliance with JESD47G.
Note 23: Guaranteed by 100% production test at elevated temperature for a shorter time; equivalence of this production test to the
data sheet limit at operating temperature range is established by reliability testing.
Note 24: EEPROM writes can become nonfunctional after the data retention time is exceeded. Long-term storage at elevated tem-
peratures is not recommended.
Note 25: Refer to the full data sheet.
Maxim Integrated
3
ABRIDGED DATA SHEET
DS28E22
1-Wire SHA-256 Secure Authenticator
with 2Kb User EEPROM
Pin Configuration
TOP VIEW
TOP VIEW
+
DS28E22
GND
IO
1
2
3
6
5
4
N.C.
N.C.
N.C.
+
N.C.
IO
1
2
3
6
5
4
N.C.
N.C.
N.C.
DS28E22
N.C.
GND
TSOC
EP
TDFN
(3mm × 3mm)
Pin Description
PIN
NAME
FUNCTION
TSOC
TDFN-EP
1
2
3
2
GND
IO
Ground Reference
1-Wire Bus Interface. Open-drain signal that requires an external pullup resistor.
Not Connected
3, 4, 5, 6
1, 4, 5, 6
N.C.
Exposed Pad (TDFN only). Solder evenly to the board’s ground plane for proper
operation. Refer to Application Note 3273: Exposed Pads: A Brief Introduction for
additional information.
—
—
EP
Maxim Integrated
4
ABRIDGED DATA SHEET
DS28E22
1-Wire SHA-256 Secure Authenticator
with 2Kb User EEPROM
Note to readers: This document is an abridged version of the full data sheet. Additional device information is
available only in the full version of the data sheet. To request the full data sheet, go to www.maximintegrated.
com/DS28E22 and click on Request Full Data Sheet.
Ordering Information
Package Information
For the latest package outline information and land patterns (foot-
prints), go to www.maximintegrated.com/packages. Note that
a “+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PART
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 6 TSOC
DS28E22P+*
DS28E22P+T*
DS28E22Q+T
-40°C to +85°C 6 TSOC (4k pcs)
-40°C to +85°C 6 TDFN-EP** (2.5k pcs)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*Future product—contact factory for availability.
**EP = Exposed pad.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
6 TSOC
D6+1
21-0382
21-0137
90-0321
90-0058
6 TDFN-EP
T633+2
Maxim Integrated
42
ABRIDGED DATA SHEET
DS28E22
1-Wire SHA-256 Secure Authenticator
with 2Kb User EEPROM
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
9/12
Initial release
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
43
©
2012 Maxim Integrated
The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
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