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X1227S8I-2.7 参数 Datasheet PDF下载

X1227S8I-2.7图片预览
型号: X1227S8I-2.7
PDF下载: 下载PDF文件 查看货源
内容描述: 实时时钟/日历/ CPU监控器, EEPROM [Real Time Clock/Calendar/CPU Supervisor with EEPROM]
分类和应用: 计时器或实时时钟微控制器和处理器外围集成电路光电二极管监控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
文件页数/大小: 28 页 / 442 K
品牌: XICOR [ XICOR INC. ]
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X1227  
Referring to Figure 16, Vtrip applies to the Internal  
Vccnode which powers the entire device. This means  
that if Vcc is powered down and the battery voltage at  
Vback is higher than the Vtrip voltage, then the entire  
chip will be running from the battery. If Vback falls to  
lower than Vtrip, then the chip shuts down and all out-  
puts are disabled except for the oscillator and time-  
keeping circuitry. The fact that the chip can be powered  
from Vback is not necessarily an issue since standby  
current for the RTC devices is <2µA for this mode  
(called main timekeeping currentin the data sheet).  
Only when the serial interface is active is there an  
increase in supply current, and with Vcc powered  
down, the serial interface will most likely be inactive.  
PERFORMANCE DATA  
Performance  
I
BACK  
I
vs. Temperature  
BACK  
Multi-Lot Process Variation Data  
1.4  
3.3V  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
1.8V  
One way to prevent operation in battery backup mode  
above the Vtrip level is to add a diode drop (silicon  
diode preferred) to the battery to insure it is below  
Vtrip. This will also provide reverse leakage protection  
which may be needed to get safety agency approval.  
-40  
25  
60  
85  
Temperature °C  
One mode that should always be avoided is the opera-  
tion of the RTC device with Vback greater than both  
Vcc and Vtrip (Condition 2d in Table 8). This will cause  
the battery to drain quickly as serial bus communica-  
tion and non-volatile writes will require higher supplier  
current.  
Characteristics subject to change without notice. 24 of 28  
REV 1.1.20 1/13/03  
www.xicor.com  
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