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DS2460SR

更新时间： 2024-01-14 16:02:45

品牌	Logo	应用领域
美信 - MAXIM		可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数	文件大小	规格书
9页	211K
描述
SHA-1 Coprocessor with EEPROMAbridged Data Sheet

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技术参数
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DS2460SR 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP, SOP8,.25	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.31.00.01	Factory Lead Time：	6 weeks
风险等级：	1.3	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.9 mm
湿度敏感等级：	1	端子数量：	8
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
封装等效代码：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	3/5 V	认证状态：	Not Qualified
座面最大高度：	1.75 mm	子类别：	Other Microprocessor ICs
最大压摆率：	0.5 mA	最大供电电压：	5.5 V
最小供电电压：	2.7 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	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：	MICROPROCESSOR CIRCUIT	Base Number Matches：	1

DS2460SR 数据手册

Abridged Data Sheet

DS2460

Read and Write

This section discusses the read and write behavior of the various registers and the EEPROM. Please refer to the

full data sheet for details.

SHA-1 Engine Control

This section describes the user’s view of the SHA-1 engine and how to operate it. For details refer to the full data

sheet (includes Figures 7 to 9 and Tables 1 and 2).

SHA-1 COMPUTATION ALGORITHM

This description of the SHA computation is adapted from the Secure Hash Standard SHA-1 document that can be

downloaded from the NIST website (www.itl.nist.gov/fipspubs/fip180-1.htm). Further details are found in the full

version of the data sheet.

Application Information

SDA and SCL Pullup Resistors

SDA is an open-drain output on the DS2460 that requires a pullup resistor (Figure 10) to realize high logic levels.

Because the DS2460 uses SCL only as input (no clock stretching) the master can drive SCL either through an

open-drain/collector output with a pullup resistor or a push-pull output.

Figure 10. Application Schematic

V_CC

R_P

V_CC

To additional

2-wire devices

SDA

SCL

V_CC

µC

SDA

SCL

AD0

AD1

AD2

Example

slave

address =

100 0101

GND

Pullup Resistor R_PSizing

According to the I²C specification, a slave device must be able to sink at least 3mA at a V_OLof 0.4V. This DC

condition determines the minimum value of the pullup resistor: R_PMIN= (V_CC- 0.4V)/3mA. With an operating voltage

of 5.5V, the minimum value for the pullup resistor is 1.7k. The "Minimum R_P" line in Figure 11 shows how the

minimum pullup resistor changes with the operating (pull-up) voltage.

For I²C systems, the rise time and fall time are measured from 30% to 70% of the pullup voltage. The maximum

bus capacitance C_Bis 400pF. The maximum rise time must not exceed 300ns. Assuming maximum rise time, the

maximum resistor value at any given capacitance C_Bis calculated as: R_PMAX= 300ns/(C_B*ln(7/3)). For a bus

capacitance of 400pF the maximum pullup resistor would be 885.

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1...4 5 678 9

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