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DS1977-F5#

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
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iButton DESCRIPTION
The DS1977 is a 32KB EEPROM in a rugged,
i
Button
®
enclosure. Access to the memory can be
password-protected with different passwords for
read-only and full access. Data is transferred serially
through the 1-Wire
®
protocol, which requires only a
single data lead and a ground return. Every DS1977
is factory lasered with a guaranteed unique 64-bit
registration number that allows for absolute
traceability. The durable stainless-steel i
Button
package is highly resistant to environmental hazards
such as dirt, moisture, and shock. Accessories permit
the DS1977 i
Button to be mounted on almost any
object, including containers, pallets, and bags.
APPLICATIONS
Maintenance/Inspection Data Storage
Medical Data Carrier
Health Data Carrier
Audit Data Storage and Carrier
F5 MicroCAN
IO
GND
0.51
5.89
16.25
17.35
FC 37
000000FBC52B
All dimensions are shown in millimeters.
SPECIAL FEATURES
32KB EEPROM Organized as Pages of 64 Bytes
Each
Optional Password Protection with Different 64-
Bit Passwords for Read and Full Access
Communicates to Host with a Single Digital
Signal at Up to 15.3kbps at Standard Speed or
Up to 125kbps in Overdrive Mode Using 1-Wire
Protocol
Operating Range: 2.8V to 5.25V, -40°C to +85°C
Minimum 100k Write Cycles Endurance
15kV Built-in ESD Protection
COMMON iButton FEATURES
Unique Factory-Lasered 64-Bit Registration
Number Assures Error-Free Device Selection
and Absolute Traceability Because No Two Parts
are Alike
Built-In Multidrop Controller for 1-Wire Net
Chip-Based Data Carrier Stores Digital
Identification and Information, Armored in a
Durable Stainless-Steel Case
Data can be Accessed While Affixed to Object
Button Shape is Self-Aligning with Cup-Shaped
Probes
Easily Affixed with Self-Stick Adhesive Backing,
Latched by its Flange, or Locked with a Ring
Pressed onto its Rim
Presence Detector Acknowledges when Reader
First Applies Voltage
ORDERING INFORMATION
PART TEMP RANGE PACKAGE
DS1977-F5#
-40°C to +85°C
F5 iButton
#Denotes a RoHS-compliant device that may include lead(Pb) that
is exempt under the RoHS requirements.
EXAMPLES OF ACCESSORIES
PART DESCRIPTION
DS9096P
Self-Stick Adhesive Pad
DS9101
Multipurpose Clip
DS9093RA
Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
iButton and 1-Wire are registered trademarks of Maxim
Integrated Products, Inc.
19-4890; Rev 11/09
DS1977
Password-Protected 32KB EEPROM iButton
DS1977
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PHYSICAL SPECIFICATION
Size
See mechanical drawing
Weight DS1977
Ca. 3.3g
ABSOLUTE MAXIMUM RATINGS
I/O Voltage to GND
-0.3V, +5.5V
I/O Sink Current
20mA
Junction Temperature
+150°C
Storage Temperature Range
-40°C to +85°C
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 the absolute maximum rating conditions for extended periods may affect device.
ELECTRICAL CHARACTERISTICS
(V
PUP
= 2.8V to 5.25V, T
A
= -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I/O Pin General Data
1-Wire Pullup
Resistance
R
PUP
(Notes 1, 2) 0.6 2.2
kΩ
Input Capacitance
C
IO
(Note 3)
5
nF
Input Load Current
I
L
I/O pin at V
PUP
1
10
µA
High-to-Low Switching
Threshold
V
TL
(Notes 4, 5) 0.5 3.2 V
Input Low Voltage
V
IL
(Notes 1, 6)
0.30
V
Low-to-High Switching
Threshold
V
TH
(Notes 4, 7) 0.7 3.4 V
Switching Hysteresis
V
HY
(Note 8)
0.15
N/A
V
Output-Low Voltage at
4mA
V
OL
(Note 9) 0.4 V
Recovery Time t
REC
Standard speed, R
PUP
= 2.2kΩ
(Note 1)
5
µs
Overdrive speed, R
PUP
= 2.2kΩ
(Note 1)
2
Overdrive speed, directly prior
to reset pulse; R
PUP
= 2.2kΩ
(Note 1)
5
Rising-Edge Hold-off
Time
t
REH
Standard speed (Note 10)
0.5
5
µs
Overdrive speed (Note 10)
0.5
2
Timeslot Duration t
SLOT
Standard speed (Note 1)
65
µs
Overdrive speed (Note 1)
8
I/O Pin, 1-Wire Reset, Presence Detect Cycle
Reset Low Time t
RSTL
Standard speed (Note 1)
480
640
µs
Overdrive Speed (Note 1)
48
80
Presence Detect High
Time
t
PDH
Standard speed (Note 11)
15
60
µs
Overdrive speed (Note 11)
2.5
6.5
Presence Detect Fall
Time
t
FPD
Standard speed, V
PUP
> 4.5V
(Note 12)
1.5 5
µs
Standard speed (Note 12)
1.5
8
Overdrive speed (Note 12)
0.15
1
Presence Detect Low
Time
t
PDL
Standard speed
60
240
µs
Overdrive speed
8
24
DS1977
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PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Presence Detect
Sample Time
t
MSP
Standard speed, V
PUP
> 4.5V
(Note 1)
65 75
µs
Standard speed (Note 1)
68
75
Overdrive speed (Note 1)
7.5
10.5
I/O Pin, 1-Wire Write
Write-0 Low Time t
W0L
Standard speed (Notes 1, 13)
60
120
µs
Overdrive speed (Notes 1, 13)
6
16
Write-1 Low Time t
W1L
Standard speed (Notes 1, 13)
5
15
µs
Overdrive speed (Notes 1, 13)
1
2
I/O Pin, 1-Wire Read
Read Low Time t
RL
Standard speed (Notes 1, 14)
5
15 -
δ
µs
Overdrive speed (Notes 1, 14)
1
2 -
δ
Read Sample Time t
MSR
Standard speed,
V
PUP
> 4.5V (Notes 1, 14)
t
RL
+ δ
20
µs
Standard speed (Notes 1, 14)
t
RL
+
δ
15
Overdrive speed (Notes 1, 14)
t
RL
+
δ
2
I/O Pin, Strong Pullup
Strong Pullup Read
t
SPUR
(Note 1)
2.64
ms
Strong Pullup Write
t
SPUW
(Note 1)
22.46
ms
Strong Pullup password
verification
t
SPUV
(Note 1) 0.62 ms
EEPROM
Programming Current
I
LPROG
7
mA
Write/Erase Cycles
N
CYCLE
100k
—
Data Retention
t
RET
10
years
Note 1:
System requirement.
Note 2:
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. For more heavily loaded
systems, an active pullup such as that found in the DS2480B may be required.
Note 3:
Capacitance on the data pin could be 5nF when power is first applied.
Note 4:
V
TL
and V
TH
are functions of the internal supply voltage, which is a function of V
PUP
and the 1-Wire recovery times. The V
TH
and V
TL
maximum specifications are valid at V
PUPMAX
(5.25V). In any case, V
TL
< V
TH
< V
PUP
.
Note 5:
Voltage below which, during a falling edge on I/O, a logic '0' is detected.
Note 6:
The voltage on I/O needs to be less or equal to V
ILMAX
whenever the master drives the line low.
Note 7:
Voltage above which, during a rising edge on I/O, a logic '1' is detected.
Note 8:
After V
TH
is crossed during a rising edge on I/O, the voltage on I/O has to drop by V
HY
to be detected as logic '0'.
Note 9:
The I-V characteristic is linear for voltages less than 1V.
Note 10:
The earliest recognition of a negative edge is possible at t
REH
after V
TH
has been reached before.
Note 11:
Highlighted numbers are NOT in compliance with the published iButton standards. See comparison table below.
Note 12:
Interval during the negative edge on I/O at the beginning of a Presence Detect pulse between the time at which the voltage is 90%
of V
PUP
and the time at which the voltage is 10% of V
PUP
.
Note 13:
ε in Figure 11 represents the time required for the pullup circuitry to pull the voltage on I/O up from V
IL
to V
TH
. The actual maximum
duration for the master to pull the line low is t
W1LMAX
+ t
F
-
ε
and t
W0LMAX
+ t
F
-
ε
respectively.
Note 14:
δ in Figure 11 represents the time required for the pullup circuitry to pull the voltage on I/O up from V
IL
to the input-high threshold of
the bus master. The actual maximum duration for the master to pull the line low is t
RLMAX
+ t
F
.
Parameter
Name
Standard Values
DS1977 Values
Standard Speed
Overdrive Speed
Standard Speed
Overdrive Speed
min
max
min
max
min
max
min
max
t
SLOT
(incl. t
REC
)
61µs
(undef.)
7µs
(undef.)
65µs
1)
(undef.)
8µs
1)
(undef.)
t
RSTL
480µs
(undef.)
48µs
80µs
480µs
640µs
48µs
80µs
t
PDH
15µs
60µs
2µs
6µs
15µs
60µs
2.5µs
6.5µs
t
PDL
60µs
240µs
8µs
24µs
60µs
240µs
8µs
24µs
t
W0L
60µs
120µs
6µs
16µs
60µs
120µs
6µs
16µs
1) Intentional change, longer recovery time requirement due to modified 1-Wire front end.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29

DS1977-F5#

Mfr. #:
Buy DS1977-F5#
Manufacturer:
Maxim Integrated
Description:
iButtons & Accessories Password-Protected 32KB EEPROM iButton
Lifecycle:
New from this manufacturer.
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