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DS1990A
Serial Number iButton
ABSOLUTE MAXIMUM RATINGS
IO Voltage Range to GND .....................................-0.5V to +6.0V
IO Sink Current....................................................................20mA
Junction Temperature ......................................................+125°C
Storage Temperature Range .............................-55°C to +125°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
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(T A = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IO PIN: GENERAL DATA
1-Wire Pullup Voltage
1-Wire Pullup Resistance
Input Capacitance
V PUP
R PUP
C IO
(Notes 1, 2)
(Notes 3, 4)
(Notes 5, 6)
2.8
0.6
100
6.0
5
800
V
k
pF
Input Load Current
Input Low Voltage
Input High Voltage
Output Low Voltage at 4mA
Operating Charge
Recovery Time
Time Slot Duration
I L
V IL
V IH
V OL
Q OP
t REC
t SLOT
(Note 7)
(Notes 1, 3, 8)
(Notes 1, 9)
(Note 1)
(Notes 6, 10)
(Note 3)
(Note 3)
2.2
1
61
0.25
30
0.3
0.4
μA
V
V
V
nC
μs
μs
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Reset Low Time
Reset High Time
t RSTL
t RSTH
(Notes 3, 11)
(Notes 3, 12)
480
480
μs
μs
Presence-Detect High Time
t PDH
15
60
μs
Presence-Detect Low Time
Presence-Detect Sample Time
t PDL
t MSP
(Note 13)
(Note 3)
60
60
240
75
μs
μs
IO PIN: 1-Wire WRITE
Write-Zero Low Time
Write-One Low Time
t W0L
t W1L
(Notes 3, 14)
(Notes 3, 14)
60
1
120
15
μs
μs
IO PIN: 1-Wire READ
Read Low Time
Read Sample Time
t RL
t MSR
(Notes 3, 15)
(Notes 3, 15)
1
t RL +
15 -
15
μs
μs
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
2
All voltages are referenced to ground.
External pullup voltage. See Figure 4.
System requirement.
Full R PUP range is guaranteed by design and simulation and not production tested. Production testing performed at a
fixed R PUP value. 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 recov-
ery times. For more heavily loaded systems, an active pullup such as that found in the DS2480B may be required.
Capacitance on the IO pin could be 800pF when power is first applied. If a 5k Ω resistor is used to pull up the IO line to
V PUP , 5μs after power has been applied the parasite capacitance will not affect normal communications.
Guaranteed by design, simulation only. Not production tested.
Input load is to ground.
Maxim Integrated
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RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体:
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RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体:
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功能描述:序列号注册
RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体:
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功能描述:序列号注册
RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体:
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功能描述:序列号注册 RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体:
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功能描述:序列号注册 RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体:
DS1990A-F5/E4F
功能描述:序列号注册 RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体:
DS1990A-F5+
功能描述:序列号注册 Serial Number iButton RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体: