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DS1210SN

更新时间： 2024-02-06 05:41:17
品牌 Logo 应用领域
美信 - MAXIM 光电二极管
页数 文件大小 规格书
8页 334K
描述
Power Supply Support Circuit, Fixed, 3 Channel, CMOS, PDSO16, 0.300 INCH, SOIC-16

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DS1210SN 技术参数

是否无铅：含铅是否Rohs认证：不符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：0.300 INCH, SOIC-16针数：16
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.31.00.01风险等级：5.3
Is Samacsys：N可调阈值：NO
模拟集成电路 - 其他类型：POWER SUPPLY SUPPORT CIRCUITJESD-30 代码：R-PDSO-G16
JESD-609代码：e0长度：10.3 mm
湿度敏感等级：1信道数量：3
功能数量：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
封装等效代码：SOP16,.4封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：245
电源：5 V认证状态：Not Qualified
座面最大高度：2.65 mm子类别：Power Management Circuits
最大供电电流 (Isup)：80 mA最大供电电压 (Vsup)：5.5 V
最小供电电压 (Vsup)：4.5 V标称供电电压 (Vsup)：5 V
表面贴装：YES技术：CMOS
温度等级：INDUSTRIAL端子面层：TIN LEAD
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：7.5 mmBase Number Matches：1

DS1210SN 数据手册

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DS1210  
OPERATION  
The DS1210 nonvolatile controller performs five circuit functions required to battery back up a RAM.  
First, a switch is provided to direct power from the battery or the incoming supply (VCCI) depending on  
which is greater. This switch has a voltage drop of less than 0.3V.  
The second function which the nonvolatile controller provides is power-fail detection. The DS1210  
constantly monitors the incoming supply. When the supply goes out of tolerance, a precision comparator  
detects power-fail and inhibits chip enable (CEO ).  
The third function of write protection is accomplished by holding the CEO output signal to within 0.2  
volts of the VCCI or battery supply. If CE input is low at the time power-fail detection occurs, the CEO  
output is kept in its present state until CE is returned high. The delay of write protection until the current  
memory cycle is completed prevents the corruption of data. Power-fail detection occurs in the range of  
4.75 volts to 4.5 volts with the tolerance (TOL) pin grounded. If TOL in connected to VCCO, then power-  
fail detection occurs in the range of 4.5 volts to 4.25 volts. During nominal supply conditions CEO will  
follow CE with a maximum propagation delay of 20ns.  
The fourth function the DS1210 performs is a battery status warning so that potential data loss is avoided.  
Each time that the circuit is powered up the battery voltage is checked with a precision comparator. If the  
battery voltage is less than 2.0 volts, the second memory cycle is inhibited. Battery status can, therefore,  
be determined by performing a read cycle after power-up to any location in memory, verifying that  
memory location content. A subsequent write cycle can then be executed to the same memory location  
altering the data. If the next read cycle fails to verify the written data, then the batteries are less than 2.0V  
and data is in danger of being corrupted.  
The fifth function of the nonvolatile controller provides for battery redundancy. In many applications,  
data integrity is paramount. In these applications it is often desirable to use two batteries to ensure  
reliability. The DS1210 controller provides an internal isolation switch which allows the connection of  
two batteries. During battery backup operation the battery with the highest voltage is selected for use. If  
one battery should fail, the other will take over the load. The switch to a redundant battery is transparent  
to circuit operation and to the user. A battery status warning will occur when the battery in use falls below  
2.0 volts. A grounded VBAT2 pin will not activate a battery-fail warning. In applications where battery  
redundancy is not required, a single battery should be connected to the BAT1 pin, and the BAT2 battery  
pin must be grounded. The nonvolatile controller contains circuitry to turn off the battery backup. This is  
to maintain the battery(s) at its highest capacity until the equipment is powered up and valid data is  
written to the SRAM. While in the freshness seal mode the CEO and VCCO will be forced to VOL. When  
the batteries are first attached to one or both of the VBAT pins, VCCO will not provide battery back-up until  
VCCI exceeds VCCTP, as set by the TOL pin, and then falls below VBAT  
.
Figure 1 shows a typical application incorporating the DS1210 in a microprocessor-based system. Section  
A shows the connections necessary to write protect the RAM when VCC is less than 4.75 volts and to back  
up the supply with batteries. Section B shows the use of the DS1210 to halt the processor when VCC is  
less than 4.75 volts and to delay its restart on power-up to prevent spurious writes.  
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