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DS1990A
Serial Number iButton
Slave-to-Master
A read-data time slot begins like a write-one time slot.
The voltage on the data line must remain below V ILMAX
until the read low time t RL is expired. During the t RL
window, when responding with a 0, the DS1990A starts
pulling the data line low; its internal timing generator
determines when this pulldown ends and the voltage
starts rising again. When responding with a 1, the
DS1990A does not hold the data line low at all, and the
voltage starts rising as soon as t RL is over.
The sum of t RL + δ (rise time) on one side and the inter-
nal timing generator of the DS1990A on the other side
define the master sampling window (t MSRMIN to
t MSRMAX ) in which the master must perform a read from
the data line. For most reliable communication, t RL
should be as short as permissible and the master should
read close to but no later than t MSRMAX . After reading
from the data line, the master must wait until t SLOT is
expired. This guarantees sufficient recovery time t REC
for the DS1990A to get ready for the next time slot.
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages .
PACKAGE TYPE
F3 iButton
F5 iButton
Maxim Integrated
PACKAGE CODE
IB#3NB
IB#5NB
DOCUMENT NO.
9
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相关代理商/技术参数
DS1990A-F3+C0B
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-F3+C80
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-F3+C8F
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-F3-W
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 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 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: