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參數(shù)資料
| 型號(hào)： | M41T81MQ6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO16 |
| 封裝： | PLASTIC, SOIC-16 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 179K |
| 代理商： | M41T81MQ6 |
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M41T81
14/28
Data Retention Mode
With valid VCC applied, the M41T81 can be ac-
cessed as described above with read or write cy-
cles.
Should the supply voltage decay, the
M41T81 will automatically deselect, write protect-
ing itself when Vcc falls between VPFD (max) and
VPFD (min). This is accomplished by internally in-
hibiting access to the clock registers and SRAM.
When Vcc falls below the Battery Back-up
Switchover Voltage (VSO), power input is switched
from the VCC pin to the battery and the clock reg-
isters and SRAM are maintained from the attached
battery supply.
All outputs become high impedance.
On power
up, when Vcc returns to a nominal value, write pro-
tection continues for tREC.
For a further more detailed review of lifetime calcu-
lations, please see Application Note AN1012.
Figure 14. Power Down/Up Mode AC Waveforms
Table 8. Power Down/Up AC Characteristics
Note: VCC fall time should not exceed 5mV/s.
Table 9. Power Down/Up Trip Points DC Characteristics
Note: All voltages referenced to VSS.
1. Switch-over and deselect point
Symbol
Parameter
Min
Typ
Max
Unit
tPD
SCL and SDA at VIH before Power Down
0nS
tREC
SCL and SDA at VIH after Power Up
10
S
Sym
Parameter
Min
Typ
Max
Unit
VSO
(1)
Battery Back-up Switchover Voltage
VBAT – 0.70
VBAT – 0.50
VBAT – 0.20
V
AI00596
VCC
tREC
tPD
VSO
SDA
SCL
DON'T CARE
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| M41T81MX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS |
| M41T81MX6 | 功能描述:實(shí)時(shí)時(shí)鐘 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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| M41T81MY6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
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