參數(shù)資料
型號(hào)： DS1644P
英文描述： Nonvolatile Timekeeping RAM
中文描述： 非易失時(shí)鐘RAM
文件頁數(shù)： 6/13頁
文件大?。?/td> 302K
代理商： DS1644P
DS1644/DS1644P
6 of 13
DATA RETENTION MODE
When V
CC
is within nominal limits (V
CC
> 4.5 volts) the DS1644 can be accessed as described above with
read or write cycles. However, when V
CC
is below the power-fail point V
PF
(point at which write
protection occurs) the internal clock registers and RAM are blocked from access. This is accomplished
internally by inhibiting access via the
CE
signal. At this time the power-fail output signal (
PFO
) will be
driven active low and will remain active until V
CC
returns to nominal levels. When V
CC
falls below the
level of the internal battery supply, power input is switched from the V
CC
pin to the internal battery and
clock activity, RAM, and clock data are maintained from the battery until V
CC
is returned to nominal
level.
相關(guān)PDF資料
PDF描述
DS1644P-120 Nonvolatile Timekeeping RAM
DS1644J Quad Clock Driver
DS1648J 2-Input Digital Multiplexer
DS3644J 800mA, Low-Voltage, DC-DC Step-Up Converter, Logic-High On - TDFN-10
DS3644N Low Voltage, 1.2 MHz, Micropower, DC-DC Step-Up Converter, Powersave Operation (medium loads), shutdown battery feedthrough - TSOT23-6
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1644P+120 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM
DS1644P-120 功能描述:實(shí)時(shí)時(shí)鐘 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
DS1644P120+ 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM
DS1644P-120+ 功能描述:實(shí)時(shí)時(shí)鐘 NV Timekeeping RAM 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
DS1644P-150 制造商:Maxim Integrated Products 功能描述:
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