Datasheet > DS2408S/T&R

DS2408S/T&R

更新时间： 2024-02-11 01:12:01

品牌	Logo	应用领域
美信 - MAXIM		光电二极管外围集成电路
页数	文件大小	规格书
36页	539K
描述
Parallel I/O Port, 8 I/O, CMOS, PDSO16, 0.150 INCH, SOP-16

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技术参数
数据手册

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DS2408S/T&R 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	0.150 INCH, SOP-16
针数：	16	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.36	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e0	长度：	9.9 mm
I/O 线路数量：	8	端口数量：	1
端子数量：	16	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	245
认证状态：	Not Qualified	座面最大高度：	1.75 mm
最大供电电压：	5.25 V	最小供电电压：	2.8 V
标称供电电压：	5 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3.9 mm
uPs/uCs/外围集成电路类型：	PARALLEL IO PORT, GENERAL PURPOSE	Base Number Matches：	1

DS2408S/T&R 数据手册

DS2408

PARASITE POWER

The DS2408 can derive its power entirely from the 1-Wire bus by storing energy on an internal capacitor

during periods of time when the signal line is high. During low times the device continues to operate from

this “parasite” power source until the 1-Wire bus returns high to replenish the parasite (capacitor) supply.

If power is available, the V_CCpin should be connected to the external voltage supply.

Figure 3. 64-BIT LASERED ROM

MSB

LSB

8-BIT

CRC CODE

8-BIT FAMILY

48-BIT SERIAL NUMBER

CODE (29h)

LSB MSB LSB

MSB LSB

MSB

64-BIT LASERED ROM

Each DS2408 contains a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code.

The next 48 bits are a unique serial number. The last eight bits are a CRC of the first 56 bits. See Figure 3

for details. The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and

XOR gates as shown in Figure 4. The polynomial is X⁸+ X⁵+ X⁴+ 1. Additional information about the

Dallas 1-Wire Cyclic Redundancy Check is available in Application Note 27.

The shift register bits are initialized to 0. Then, starting with the least significant bit of the family code,

one bit at a time is shifted in. After the eighthbit of the family code has been entered, the serial number is

entered. After the serial number has been entered, the shift register contains the CRC value. Shifting in

the eight bits of CRC returns the shift register to all 0s.

Figure 4. 1-Wire CRC GENERATOR

POLYNOMIAL = X⁸+ X⁵+ X⁴+ 1

1^st

2^nd

3^rd

4^th

5^th

6^th

7^th

8^th

STAGE STAGE

X¹

STAGE STAGE

X³

STAGE

STAGE STAGE STAGE

X⁰

X²

X⁴

X⁵

X⁶X⁷

INPUT DATA

X⁸

The registers needed to operate the DS2408 are organized as a Register Page, as shown in Figure 5. All

registers are volatile, i. e., they lose their state when the device is powered down. PIO, Conditional

Search, and Control/Status registers are read/written using the device level Read PIO Registers and Write

Conditional Search Register commands described in subsequent sections and Figure 8 of this document.

7 of 36

1...4 5 678 9 10...36

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与DS2408S/T&R相关器件

型号	品牌	描述	获取价格	数据表
DS2408S/T&R	MAXIM	1-Wire 8-Channel Addressable Switch	获取价格
DS2408S/TR	DALLAS	Micro Peripheral IC,	获取价格
DS2408S+	MAXIM	Parallel I/O Port, 8 I/O, CMOS, PDSO16, 0.150 INCH, ROHS COMPLIANT, SOP-16	获取价格
DS2408S+T&R	MAXIM	Parallel I/O Port, 8 I/O, CMOS, PDSO16, 0.150 INCH, ROHS COMPLIANT, SOP-16	获取价格
DS2409	DALLAS	MicroLAN Coupler	获取价格
DS2409P	DALLAS	MicroLAN Coupler	获取价格

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